@proceedings {1031, title = {Telling Radio Stories Through Stamps: Amateur Ham Radio and Project Magnet in Philately}, year = {2026}, month = {03/2026}, publisher = {HamSCI}, address = {Newington, CT}, abstract = {

This poster explores how amateur ham radio and Project Magnet (U.S. Navy) can be understood through postage stamps and special covers. Stamps provide visual and historical evidence of the growth of radio\ communication and large-scale scientific efforts to measure Earth{\textquoteright}s magnetic field. Amateur radio images show antennas and global contact\ symbols, reflecting the rise of a worldwide communication network built by individuals. Project Magnet, conducted around 1951, carried out airborne and shipborne geomagnetic surveys to improve magnetic charts for navigation and research. By examining philatelic materials related to radio, navigation, survey aircraft, and magnetic mapping, this poster shows how both amateur operators and naval scientists contributed to understanding invisible natural forces.

}, author = {Briti Deb} } @proceedings {1046, title = {The third annual HamSCI book club: a discussion on shortwave radio as it was used in World War II.}, year = {2026}, month = {03/2026}, publisher = {HamSCI}, address = {Newington, CT}, abstract = {

The third annual HamSCI book club: a discussion on shortwave radio as it was used in World War II. The text being used for this discussion is the novel: All the Light we Cannot See by Anthony Doerr. This text has a lot of useful themes and ideas for the world of amateur radio research, however, great emphasis will be placed on amateur radio as it relates to war efforts, and specifically the employment of shortwave radio during WWII which notably took place during Solar Cycle 18. Some particulars regarding the solar cycle and it{\textquoteright}s impact on telecommunications during the way will be discussed. Prior knowledge of the text is not required to enjoy the presentation.

}, author = {Aaron Billow and David Kazdan} } @proceedings {965, title = {Turkish Morse Code (TMK)}, year = {2025}, month = {03/2025}, publisher = {HamSCI 2025}, address = {Newark, NJ}, abstract = {

This project aims to eliminate the deficiency that arises due to the current Morse code system not supporting Turkish characters. Within the scope of the project, a new Morse code that includes Turkish characters was developed using an Arduino-based system and the effective usability of this code in communication was tested. In the study, a practical solution proposal was presented with an encoder that produces Morse code. During the experimental study, audio and visual feedback was provided using hardware elements such as LCD screen, LED and buzzer. The new code sequence was integrated into the current Morse code system and the correct transmission of Turkish characters was ensured. The findings obtained show that Turkish characters can be successfully transmitted within the Morse code system and contribute to the field of communication. This study makes a significant contribution especially in terms of amateur radio and education applications. The project also aims to create a model for STEM-based education studies and to increase students{\textquoteright} interest in electronics, communication technologies and coding.

}, author = {Hanife K{\i}l{\i}{\c c} and Ali Bertu{\u g} Y{\"u}zer and Fatih Alptu{\u g} Y{\"u}zer} } @proceedings {883, title = {Three-Channel VLF Reception System using a Raspberry Pi, Soundcard, and GNSS Receiver}, year = {2024}, month = {03/2024}, publisher = {HamSCI}, address = {Cleveland, OH}, abstract = {

A low-cost, science-grade three-channel VLF reception system can be easily constructed using a Raspberry Pi, multichannel soundcard, and GNSS receiver. An E-field VLF preamp and two-channel H-field VLF preamps are installed outside in a radio-quiet location. The signal is fed into audio isolation transformers through a pair on Cat-5 feedlines attached to the E-field and H-field VLF preamp interface. Power is delivered to the VLF preamps with isolated DC-DC converters. The signals (E-field and N-S, E-W H-field) are fed into channels 1-3 of the Audio Injector Octo soundcard via the audio input board. The GNSS PPS is fed into channel 1 of the soundcard for sample alignment and UT timestamping. The PPS is also fed into GPIO4 of the Raspberry Pi to discipline the time-of-day clock via GPS daemon and NTP daemon and allows for course sample alignment correction before finer sample alignment and timestamping. Four channels of audio are captured using the Audio Injector Octo multichannel soundcard attached to a Raspberry Pi 3. On the Pi, vlfrx-tools software handles data capture, sample alignment and time stamping, mains hum filtering, whistler and dawn chorus event detection, SID detection via VLF transmitters, data storage and retrieval, live listening, and sferic analysis. Data is stored with a rotating buffer on a 512MB USB thumb drive. It can also be streamed over the network to a local or internet-connected server for heavier signal analysis tasks, such as lightning location calculations using multiple VLF receivers and decoding of VLF amateur transmissions. Using three channels for triple axis reception, signal bearing calculations can be made as well as digitally steering the H-field loop antennas for more gain of interesting signals. It also allows for analysis of natural radio signals of both E-field and H-field.

} } @proceedings {850, title = {Trial of applying PHaRLAP raytracing to reproduce Ham spot data}, year = {2024}, month = {03/2024}, publisher = {HamSCI}, address = {Cleveland, OH}, abstract = {

HamSCI is one of the NASA{\textquoteright}s official citizen science projects. HamSCI\ spots database, which is from Reverse Beacon Network (RBN) and Weak Signal Propagation Reporter Network (WSPRNet), is of interest. Information of date, time, frequency, latitude, and longitude of transmitter and receiver are used. PHaRLAP is a raytracing tool that can trace the HF radio wave in 2D and 3D. We use the IRI model to generate the required ionospheric information. We employ the PHaRLAP\ to reproduce the ham spots database by launching the HF radio wave from the transmitter, of which its location is obtained from the HamSCI\ spots database. Then, we trace the O-mode propagation of the wave. The wave arrival latitude and longitude are then mapped into a grid based on the Amateur Radio Maidenhead Grid. Finally, we compare the raytracing-based arrival grid with the HamSCI\ arrival grid. The results, under the assumption of 1-hop propagation, show that the PHaRLAP\ raytracing can reproduce the HamSCI\ spots database well.

}, author = {Kornyanat Hozumi and Nathaniel A. Frissell and Min-Yang Chou and Gwyn Griffiths and William D. Engelke and Jia Yue and Shing Fung and Masha Kuznetsova} } @proceedings {687, title = {Tangerine SDR Integration Update}, year = {2023}, month = {03/2023}, publisher = {HamSCI}, address = {Scranton, PA}, abstract = {

This presentation will cover the current status of FPGA firmware and module testing
on the Tangerine SDR system. The system is currently using the MAX10 Development
kit, the Tangerine receiver module and clock module, and an adaptor between the
components and the Development board. The development system used Intel Quartus
version 20.1 on Linux.

}, author = {Tom McDermott and Scotty Cowling and John Ackermann} } @proceedings {713, title = {Teaching Undergraduate Computer Networking with M17}, year = {2023}, month = {03/2023}, publisher = {HamSCI}, address = {Scranton, PA}, abstract = {

M17 (https://m17project.org/) is a simple, digital, open source, full stack communications protocol designed for amateur radio use. Its characteristics suggest it would make a perfect case study for a detail-oriented undergraduate computer science networking course. This presentation will introduce M17 and assess the suitability of its codebase for pedagogy, answering the question {\textquoteleft}How can it be used as a springboard for network protocol coding and experimentation?{\textquoteright} by providing examples of its utilization in lecture and lab with reference to the ACM Computing Curricula 2020 and joint ACM/IEEE Computer Science Curricula 2013 guidelines.

}, author = {Anthony Kapolka} } @proceedings {722, title = {Teaching Undergraduate Computer Networking with M17}, year = {2023}, month = {03/2023}, publisher = {HamSCI}, address = {Scranton, PA}, abstract = {

M17 (https://m17project.org/) is a simple, digital, open source, full stack communications protocol designed for amateur radio use. Its characteristics suggest it would make a perfect case study for a detail-oriented undergraduate computer science networking course. This presentation will introduce M17 and assess the suitability of its codebase for pedagogy, answering the question {\textquoteleft}How can it be used as a springboard for network protocol coding and experimentation?{\textquoteright} by providing examples of its utilization in lecture and lab with reference to the ACM Computing Curricula 2020 and joint ACM/IEEE Computer Science Curricula 2013 guidelines.

}, author = {Anthony Kapolka} } @proceedings {715, title = {Temperature Modeling and Control on Multi-Core System-on-Chip}, year = {2023}, month = {03/2023}, publisher = {HamSCI}, address = {Scranton, PA}, abstract = {

As semiconductor technology continues its marching toward the deep sub-micron domain, soaring power consumption and rising temperature have become major concerns for modern embedded systems design. A series of numerical and analytical system-level power and thermal modeling methodologies have been developed for power and temperature analysis on different system scales and architectures. In this work, we study stable state power and temperature modeling using ZYNQ SoC embedded architecture. First, we compare the power models{\textquoteright}\ accuracy with and without leakage-temperature dependency. Then, we study the single-core and multi-core temperature modeling in the thermal stable state. At last, we validate the theoretical models using deep neural network applications.

}, author = {Sarah Azaizeh and Olivia Marsh and Shi Sha} } @proceedings {723, title = {Three-channel VLF Data Acquisition and Signal Processing with a Raspberry Pi, Multi-channel soundcard, and GPS Receiver}, year = {2023}, month = {03/2023}, publisher = {HamSCI}, address = {Scranton, PA}, abstract = {

Using a Raspberry Pi, Audio Injector Octo multi-channel soundcard, and GPS receiver, a 3-channel VLF data acquisition system can be realized with an E-field receiver and orthogonal loop H-field receiver for triple axis reception of VLF natural phenomena and Amateur VLF transmission. Signal timestamping for correlation is accomplished with the GPS receiver and signal processing is accomplished with vlfrx-tools software. A network of these systems with associated VLF receivers has applications such as lightning location and location of other natural radio signals, sferic analysis, natural radio event study in multiple locations, interferometry of Amateur VLF transmissions, and more.

}, author = {Jonathan Rizzo} } @proceedings {730, title = {Through a Channel Dispersively with FB Copy: An Experience of fldigi Operating Modes}, year = {2023}, month = {03/2023}, publisher = {HamSCI}, address = {Scranton, PA}, abstract = {

Bring a laptop with fldigi installed for the microphone/speaker soundcard
Have some small .jpg files to send.
Try different phase and frequency digital modes in noise, multipath, and dispersion, discuss the fldigi {\textquoteright}scope views.

}, author = {Kristina Collins and Rachel Boedicker and David Kazdan} } @proceedings {712, title = {Time Difference of Arrival (TDOA) Measurements on Multipath Propagation Modes to Profile Ionospheric Layer Height Changes During Solar Eclipses}, year = {2023}, month = {03/2023}, publisher = {HamSCI}, address = {Scranton, PA}, abstract = {

A science objective for the 2023 and 2024 eclipses is to measure how HF propagation changes with eclipse passage. Two parameters of interest are the change in effective in F2 ionization layer height caused by the momentary blockage of solar radiation and the symmetry in recovery as solar radiation returns after eclipse passage. The changes in layer height that occurred during the 2017 eclipse and that occur daily at dawn and dusk have been studied by both Doppler analyses and, in the latter case more directly by Time-of-Flight (TOF) measurements. The WWV analyses were enabled by the station{\textquoteright}s precise carrier frequency accuracy and by transmission of timing markers precisely synchronized to UTC. The objective of the proposed SEQP experiment is to acquire similar data from amateur radio stations using common amateur radio equipment and authorized frequencies. But most amateur radios possess neither the frequency stability for accurate Doppler analysis nor an easy way to time-synchronize for accurate TOF measurements. However, over propagation paths that support transmission of multiple hops, an audio chirp waveform can be transmitted to measure the Time Difference of Arrival (TDOA) between multipath modes, particularly the 1- and 2- hop modes. For a given TX-RX path, the arrival times for multiple hops from a common ionization layer are geometrically locked together by ground distance, layer height, and geometry. Therefore a 1-hop, 2-hop TDOA measurement could be used to infer effective layer height and track how it changes with time over the course of the eclipse. The method is like a conventional chirp radar technique but instead of the usual swept carrier an audio chirp is fed into the microphone input of a radio transmitter operating in voice mode. The TDOA approach eliminates the need for precise frequency and timing accuracy, allowing the use of simple amateur radio equipment. This paper presents the methodology proposed for use in the experiments, gives examples of TDOA measurements already performed using the scientific waveforms being transmitted at 8 and 48 minutes after the hour by WWV and WWVH, and discusses anticipated issues associated with the method.

}, author = {Stephen A. Cerwin} } @proceedings {751, title = {Toward Developing an Algorithm for Separation of Transmitters of High Frequency Chirp Signals of Opportunity for the Purpose of Ionospheric Sounding}, year = {2023}, month = {03/2023}, publisher = {HamSCI}, address = {Scranton, PA}, author = {Simal Sami and Nisha Yadav and Nathaniel A. Frissell and Robert Spalletta and Declan Mulhall and Dev Raj Joshi and Juha Vierinen} } @proceedings {761, title = {Two Solar Eclipses and A Solar Max: The Heliophysics Big Year}, year = {2023}, month = {03/2023}, publisher = {HamSCI}, address = {Scranton, PA}, abstract = {

The presentation will highlight the Heliophysics Big Year HBY emphasizing: The annular solar eclipse (Oct 14, 2023); The total solar eclipse (Apr 8, 2024); The Solar Max (Solar Cycle 25).\ 

}, author = {Esayas Shume} } @proceedings {629, title = {TangerineSDR Architecture and Hardware Update}, year = {2022}, month = {03/2022}, publisher = {HamSCI}, address = {Huntsville, AL}, abstract = {

We will explain the Tangerine ecosystem and how it stacks up against other radio systems. Learn about the Clock Module (CKM), RF Module (RFM), Data Engine (DE), Magnetometer Module, VLF Receiver Module and the two newest modules, the DE Adapter and the CKM Carrier. The modular and useful approach of the TangerineSDR will allow users to build many different radio configurations at many price-points. The hardware status will be presented in light of the current supply-chain shortages.

}, author = {Scott H. Cowling} } @proceedings {625, title = {Three Time-of-Flight Measurement Projects on a Common Hardware Platform}, year = {2022}, month = {03/2022}, publisher = {HamSCI}, address = {Huntsville, AL}, abstract = {

Three undergraduate electrical engineering project groups at Case Western Reserve University are investigating distributed ionospheric sounding through time-of-flight measurements.\  All use GPS pulse-per-second signals for precise timing of received signals.\  Two use as their "radar signals of opportunity" LF, MF, and HF beacons from the US Department of Commerce National Institute of Science and Technology installations north of Fort Collins, Colorado and near Kekaha, Hawaii (radio stations WWVB, WWV, and WWVH).\  The third project modernizes the on-off telegraphy variant known as "coherent CW" (CCW). CCW uses amateur radio QSO or beacon transmissions as the measured signals.\  It facilitates Technician-licensee participation in active HF research and in keyboard-to-keyboard digital contacts, within FCC regulations.\  Using computed matched-filter techniques along the lines of FT8, CCW has a nearly optimal information-theoretic data recovery.\  With transmission or lookup of station locations, it can provide automated time of flight measurements while making a contact.\  The three projects use a common hardware platform for receiver or transceiver interfacing, involving synchronized analog data collection and front-end data processing with the Teensy variant of the Arduino platform.\  Teensy was chosen primarily for its sampling and computing speed. WWVB{\textquoteright}s signal can be sampled directly with the Teensy front-end and some data processing can done between sample acquisitions through timer interrupt programming.\  WWV/H second ticks delay measurements use inexpensive shortwave radio audio outputs, sampled and processed by the Teensy.\  The CCW sampling and matched filtering, plus synchronized Morse keying, are similarly done by the Teensy. Data presentation, user interface, and data uploading to repositories are done by minimal general purpose computers such as Raspberry Pi boards.\  We will present the common hardware and interrupt strategies along with a brief overview of the three projects.\  Comments and suggestions will be solicited, and of course participation in the projects is invited.\  The three projects are supported by a generous grant to the Case Amateur Radio Club W8EDU from ARDC.\  CARC is providing oversight of the projects and the projects use the club station as a laboratory facility.

}, author = {David Kazdan and John Gibbons and Kristina Collins and Maxwell Bauer and Evan Bender and Ryan Marks and Michael O{\textquoteright}Brien and Olivia O{\textquoteright}Brien and Gabriel Foss and Mari Pugliese and Alejandra Ramos and Carolina Whitaker} } @proceedings {507, title = {TangerineSDR Clock Module Design}, year = {2021}, month = {03/2021}, publisher = {HamSCI}, address = {Scranton, PA (Virtual)}, abstract = {

The PSWS clock module provides a high accuracy frequency and time source for the TangerineSDR.\  It will also be available in a standalone version called the "SynthDO" for other time and frequency applications.\  The clock module has gone through a major revision in design philosophy and the current version combines significantly lower component cost with great flexibility in the output configuration.\  This presentation will describe the new architecture and point out some of its pros and cons.

}, author = {John Ackermann} } @proceedings {502, title = {TangerineSDR Data Engine and Overall Architecture}, year = {2021}, month = {03/2021}, publisher = {HamSCI}, address = {Scranton, PA (Virtual)}, abstract = {

First conceived in 2018 at the ARRL/TAPR Alubuquerque Digital Communications Conference, the modular TangerineSDR has gone through many architecture changes and upgrades. The first use case will be the Personal Space Weather Station (PSWS). The boardset consists of three custom boards: the Data Engine (DE), the Clock Module (CKM) and the RF Module (RFM). Now that we are nearing prototype hardware, here is an overview of the final architecture and the status of the prototype build.

}, author = {Scott H. Cowling and Tom McDermott and John Ackermann} } @proceedings {509, title = {TangerineSDR for the HamSCI Personal Space Weather Station}, year = {2021}, month = {03/2021}, publisher = {HamSCI}, address = {Scranton, PA (Virtual)}, abstract = {

The TangerinSDR is a modular SDR serving several use cases. The first use case will be hardware for the HamSCI Personal Space Weather Station, or PSWS. Take a look here for hardware details of the TangerineSDR from TAPR and how it will support the HamSCI PSWS!

}, author = {Scott H. Cowling} } @proceedings {503, title = {TangerineSDR Software Demo}, year = {2021}, month = {03/2021}, publisher = {HamSCI}, address = {Scranton, PA (Virtual)}, abstract = {

While doing the hardware engineering for the Tangerine SDR has been in progress, we developed a simulator to act as a Data Engine until the hardware is ready. Using a FlexRadio 6600 to supply the IQ data, we were able to use the simulator to bring the Local Host software to a high level of functionality and readiness for use as part of the Tangerine when the hardware Data Engine is ready. This is a demo of the Tangerine SDR Local Host using the simulator and FlexRadio.

}, author = {William D. Engelke} } @proceedings {482, title = {Thunderstorms as Possible HF Radiation Sources of Propagation Teepee Signatures}, year = {2021}, month = {03/2021}, publisher = {HamSCI}, address = {Scranton, PA (Virtual)}, abstract = {

Propagation teepee is a type of HF spectral feature often recorded at 15-30 MHz by a group of citizen scientists whose main interest is in observing radio emissions from Jupiter. The feature is characterized as spectral enhancements with the frequency of enhancement first increasing and then decreasing with time, resulting in a {\textquotedblleft}triangular spectral feature.{\textquotedblright} Its shape is reminiscent of teepee tents (or TPs for short), the moveable dwellings of some groups of native-Americans.\  TPs usually have sharp or well-defined upper frequency limits for both the leading and trailing edges (see figure). While some TPs are observed in isolation, they are often seen in groups, distributed either in time or in apex frequency as a nested group at a particular time. As reported by Fung et al. [2020], most TPs appear to be diffuse even at high time resolution, but a few TPs seen at high time resolution reveal that those TPs consist actually of discrete bursts, strongly suggestive that the band noise could be produced by lightning storms. TP signatures are thus believed to be HF signals produced by remote lightning storms and reflected by the bottom-side ionosphere. By analyzing a few events with TP signatures detected simultaneously by multiple spectrograph stations, we will use a relationship between the TP apex frequency and the distance to its radiation source to identify the lightning storms responsible for the observed TP signatures.\ 

}, url = {https://hamsci2021-uscranton.ipostersessions.com/default.aspx?s=0E-BF-8A-B2-0E-0C-9B-2B-87-78-FC-B8-84-2C-41-FB}, author = {Shing F. Fung and Todd S. Anderson and Thomas Ashcraft and Wes Greenman and David Typinski and James Brown} } @proceedings {462, title = {Toward interpretation of HF propagation data obtained by the HamSCI Community - Ray Tracers and Ionospheric Models}, year = {2021}, month = {03/2021}, publisher = {HamSCI}, address = {Scranton, PA (Virtual)}, abstract = {

Perhaps one of the most pressing questions the Ham Sci community needs to address is how data obtained by the tangerineSDR or other platforms will be interpreted to obtain scientifically useful information.\  One approach is to produce an appropriate forward model describing the ionosphere and use ray tracers to convert that model into observables that are measured using SDRs.\  The purpose of this talk is to discuss these issues in general terms, but also to discuss simulation strategies that could be useful for the data collected by a network of radio amateurs.\  I will also present on the development of an open source python-based 3-D Jones Stephenson Ray tracer and other developments out of my laboratory that are relevant to ray tracing, including implementation using cuda and the development of point-to-point ray tracing.

}, author = {Stephen R. Kaeppler and Scott Driggers and Andrew Wetzel and Alexander Murtha and Tedi Godfrey} } @proceedings {464, title = {Traveling ionospheric disturbances tracked through Doppler-shifted AM radio transmissions}, year = {2021}, month = {03/2021}, publisher = {HamSCI}, address = {Scranton, PA (Virtual)}, abstract = {

A comprehensive understanding of the ionosphere is critical for many technologies, particularly those that rely on the propagation of radio waves. This study shows that traveling ionospheric disturbances (TIDs), dawn and dusk signal divergence (terminators), and spread F\ can be tracked and analyzed using clear channel AM radio transmissions and a set of geographically distributed receivers. Early attempts by our research group to track TIDs by AM radio signals reflected from the F region of the ionosphere generated results in conflict with those derived from GPS/TEC mapping methods [Chilcote et al., 2015]. This study seeks to resolve those conflicts with a more sophisticated array of receivers spread throughout the northeastern United States. Specifically, the receivers form a ring around an 810 kHz AM radio station in Schenectady, New York. A minimum of four receivers have been operational from 3/19/20 to the present and Doppler-shifted signals, attributed to TID events, have been consistently visible across several radio channels with frequencies between 800 to 1600kHz. We have focused our study thus far on the terminator signals which appear to be consistent with photochemistry effects and on TID wave characteristic analysis. We have collected a set of exceptional TID events over the past nine months and have correlated our calculated wave characteristics with the data from GNSS TEC, digisonde, and SuperDARN in general finding good agreement between our technique and these established methods. While our study still seeks to clarify discrepancies in our data similar to those seen by Chilcote in the original study, the consistency with which our data typically agrees with other methods supports the validity of using AM radio transmissions to track TIDs in addition to other ionospheric phenomena such as the terminator.\ 

Reference: Chilcote, M., et al. (2015), Detection of traveling ionospheric disturbances by medium-frequency Doppler sounding using AM radio transmissions, Radio Sci., 50, doi:10.1002/2014RS005617.

}, author = {Claire C. Trop and James LaBelle and Philip J. Erickson and Shunrong Zhang and David McGaw and Terrence Kovacs} } @conference {374, title = {TangerineSDR Clock Module Design}, booktitle = {HamSCI Workshop 2020}, year = {2020}, month = {03/2020}, publisher = {HamSCI}, organization = {HamSCI}, address = {Scranton, PA}, abstract = {

Overview of clock module design for TangerineSDR along with a report on PPS performance of several GPS receivers.

}, author = {J. Ackermann} } @conference {372, title = {TangerineSDR Data Engine and Overall Architecture}, booktitle = {HamSCI Workshop 2020}, year = {2020}, month = {03/2020}, publisher = {HamSCI}, organization = {HamSCI}, address = {Scranton, PA}, abstract = {

A quick hardware feature review and project status of the TangerineSDR Data Engine (DE) board. Hardware components will be described, as well as a schedule time line for completion.

}, author = {S. Cowling} } @conference {375, title = {TangerineSDR Database and Control System Architecture}, booktitle = {HamSCI Workshop 2020}, year = {2020}, month = {03/2020}, publisher = {HamSCI}, organization = {HamSCI}, address = {Scranton, PA}, abstract = {

In support of the Personal Space Weather Station Network, a team at the University of Alabama are working on two parallel software efforts. First, an embedded system is being developed for the small board computer that will be a part of the TangerineSDR. This package includes a web interface for user friendliness and a main controller written in C to handle high speed data. Second, a Central Control System will be developed that users can log into and upload data they collect. This central system will be used for aggregating and analyzing data, as well as to coordinate data collection. The embedded system and central control will work together so that science data collection is easy for the user. As an added bonus, the TangerineSDR will give each user tools for observing propagation at their own location, as an aid to their ham radio activities.

}, author = {W. Engelke} } @conference {373, title = {TangerineSDR Dual-Receiver RF Module Design}, booktitle = {HamSCI Workshop 2020}, year = {2020}, month = {03/2020}, publisher = {HamSCI}, organization = {HamSCI}, address = {Scranton, PA}, abstract = {

An overview of the dual-receiver module designed for TangerineSDR, unique features of the module, and some application scenarios.

}, author = {T. McDermott} } @proceedings {438, title = {TangerineSDR Hardware Update}, year = {2020}, month = {09/2020}, url = {https://www.youtube.com/watch?v=n9p0FpZkxE4}, author = {Cowling, Scotty and Ackermann, John and McDermott, Tom} } @conference {365, title = {TangerineSDR System Architecture}, booktitle = {HamCation}, year = {2020}, month = {02/2020}, publisher = {Orlando Amateur Radio Club}, organization = {Orlando Amateur Radio Club}, address = {Orlando, FL}, author = {William D. Engelke} } @conference {439, title = {TangerineSDR VLF Module (A new module!)}, booktitle = {ARRL-TAPR Digital Communications Conference}, year = {2020}, month = {09/2020}, publisher = {ARRL-TAPR}, organization = {ARRL-TAPR}, address = {Virtual}, url = {https://www.youtube.com/watch?v=n9p0FpZkxE4}, author = {Rizzo, Jonathan} } @conference {389, title = {Temporal and Spatial Development of TEC Enhancements during Substorms}, booktitle = {HamSCI Workshop 2020}, year = {2020}, month = {03/2020}, publisher = {HamSCI}, organization = {HamSCI}, address = {Scranton, PA}, abstract = {

Total electron count (TEC) enhancements due to space weather are a threat to communications and global positioning systems (GPS). It is known that TEC enhancements occur during magnetic storms and can cover large areas for many hours, but it is also not uncommon for TEC enhancements as large as 10 TEC units to occur during substorms. Although much is known about storm-associated TECs, the temporal and spatial characteristics of substorm-associated TECs are not well established. By combining two dimensional maps of TECs over North America and Greenland and with maps of ionospheric currents derived with the spherical elementary current method [Weygand et al., 2011], we investigate the temporal and spatial changes of TEC enhancement events for both a single substorm and for multiple substorms combined using a two dimensional superposed epoch analysis. Both the single event analysis and the statistical analysis show an increase of TECs during the expansion phase. Substorm values of the TEC enhancements peak within 10 min after auroral onset and recover to nominal levels after about 40 min. TEC enhancements occur mainly within the night side region 1 current system and cover millions of square kilometers. Furthermore, these enhancements appear to be associated with enhanced precipitating electron fluxes. These results address one of goals of the Space Weather Action Plan, which are to establish benchmarks for space weather events and improve modeling and prediction of their impacts on infrastructure.

}, author = {J. Weygand} } @conference {380, title = {Traveling Ionospheric Disturbances Observed Using Doppler Measurements of Clear-Channel AM Broadcast Transmitters}, booktitle = {HamSCI Workshop 2020}, year = {2020}, month = {03/2020}, publisher = {HamSCI}, organization = {HamSCI}, address = {Scranton, PA}, abstract = {

A system has been developed and is being deployed around the Northeast US using an SDR and Raspberry Pi to receive and measure the Doppler shift of the carrier frequencies of AM broadcast stations to detect Traveling Ionospheric Disturbances.

}, author = {D. McGaw and J. LaBelle} } @conference {334, title = {The Third Source of F2 Region Variability (Booth Talk)}, booktitle = {Dayton Hamvention}, year = {2019}, month = {05/2019}, publisher = {HamSCI}, organization = {HamSCI}, address = {Xenia, OH}, abstract = {

The Third Source of F2 Region Variability: Although solar radiation instigates the ionization process and causes it to vary in the long-term (e.g., monthly and over a solar cycle) and in the short-term (daily), two other sources of short-term variability contribute significantly to the amount of F2 region ionization at any given location. These are geomagnetic field activity and events in the lower atmosphere coupling up to the ionosphere. This short talk will focus on this third source - events in the lower atmosphere coupling up to the ionosphere.

}, author = {Carl Luetzelschwab} }