TY - CONF T1 - Early Results from the Ionospheric Sounding Mode Using Chirp Ionosondes of Opportunity for the HamSCI Personal Space Weather Station T2 - 2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) Y1 - 2021 A1 - Joshi, Dev A1 - Frissell, Nathaniel A1 - Liles, William A1 - Vierinen, Juha A1 - Miller, Ethan S. AB -

The objective of the Ham Radio Science Citizen Investigation (HamSCI) Personal Space Weather Station (PSWS) project is to develop a distributed array of ground-based multi-instrument nodes capable of remote sensing the geospace system. This system is being designed with the intention of distribution to a large number of amateur radio and citizen science observers. This will create an unprecedented opportunity to probe the ionosphere at finer resolution in both time and space as all measurements will be collected into a central database for coordinated analysis. Individual nodes are being designed to service the needs of the professional space science researcher while being cost-accessible and of interest to amateur radio operators and citizen scientists. At the heart of the HamSCI PSWS will be a high performance 0.1–60 MHz software defined radio (SDR) [1] with GNSS-based precision timestamping and frequency reference. This SDR is known as the TangerineSDR and is being developed by the Tucson Amateur Packet Radio (TAPR) amateur radio organization. The primary objective of PSWS system is to gather observations to understand the short term and small spatial scale ionospheric variabilities in the ionosphere-thermosphere system. These variabilities are important for understanding a variety of geophysical phenomena such as Traveling Ionospheric Disturbances (TIDs) [2], Ionospheric absorption events, geomagnetic storms and substorms. We present early results suggesting signature of Traveling Ionospheric Disturbances (TIDs) from an ionospheric sounding mode that we intend to implement on the PSWS system, currently implemented on an Ettus N200 Universal Software Radio Peripheral (USRP) using the open source GNU Chirpsounder data collection and analysis code.

JF - 2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) ER - TY - Generic T1 - HamSCI Personal Space Weather Station (PSWS): Fall 2021 Update T2 - TAPR-ARRL Digital Communications Conference Y1 - 2021 A1 - Frissell, Nathaniel A. A1 - Joshi, Dev Raj A1 - Collins, Kristina A1 - Montare Aidan A1 - Kazdan, David A1 - Engelke, William D. A1 - Atkison, Travis A1 - Kim, Hyomin A1 - Cowling, Scott H. A1 - McDermott, Thomas C. A1 - Ackermann, John A1 - Witten, David A1 - Madey, Jules A1 - Silver, H. Ward A1 - Liles, W. A1 - Cerwin, Stephen A. A1 - Erickson, Phillip J. A1 - Miller, Ethan S, A1 - Vierinen, Juha JF - TAPR-ARRL Digital Communications Conference PB - ARRL-TAPR CY - Virtual UR - https://youtu.be/MHkz7jNynOg?t=1990 ER - TY - Generic T1 - Observations of Mid-latitude Irregularities Using the Oblique Ionosonde Sounding Mode for the HamSCI Personal Space Weather Station (Proceedings) T2 - ARRL-TAPR Digital Communications Conference Y1 - 2021 A1 - Joshi, Dev Raj A1 - Frissell, Nathaniel A. A1 - Liles, William A1 - Vierinen, Juha JF - ARRL-TAPR Digital Communications Conference PB - ARRL-TAPR CY - Virtual UR - https://youtu.be/kVY3E3e--_I?t=2542 ER - TY - CONF T1 - Observations of Mid-latitude Irregularities Using the Oblique Ionosonde Sounding Mode for the HamSCI Personal Space Weather Station T2 - American Geophysical Union Fall Meeting Y1 - 2021 A1 - Joshi, Dev Raj A1 - Frissell, Nathaniel A. A1 - Sarwar, M. Shaaf A1 - Sami, Simal A1 - Ruohoniemi, J. Michael A1 - Baker, Joseph B. H. A1 - Coster, Anthea J. A1 - Erickson, Philip J. A1 - Liles, William A1 - Vierinen, Juha A1 - Groves, Keith AB -

The spread in the echoes of high-frequency (HF, 3-30 MHz) radio waves from the F-region of the ionosphere was one of the earliest indications of plasma density irregularities in the mid-latitude F region ionosphere. Although mid-latitude spread F has been widely studied, the plasma instability mechanisms that create these irregularities are still largely unknown. This phenomenon can cause radio wave scintillation effects that degrade the performance of human-made technologies such as satellite communications and Global Navigation Satellite Systems (GNSS). Understanding these irregularities so that they can be anticipated and mitigated are important aspects of space weather research. The occurrence climatology and variability can also be helpful in validating models of these irregularities. Here, we present signatures of mid-latitude irregularities observed in oblique ionograms received near Scranton, PA transmitted by the Relocatable Over-the-Horizon Radar (ROTHR) in Chesapeake, Virginia. These observations are collected with the GNU Chirpsounder2 software, an open source software package capable of creating ionograms from frequency modulated (FM) chirp ionosondes. This ionospheric sounding mode will be implemented in the currently under-development Ham Radio Science Citizen Investigation (HamSCI) Personal Space Weather Station (PSWS), a ground-based multi-instrument system designed to remote-sense the ionosphere using signals of opportunity. Using the data from the oblique ionograms, we generate the Range Time Intensity (RTI) plots that show ionospheric dynamics through measured path length variations as a function of time. We also compare the RTI plots with Range-Time-Parameter (RTP) plots from the SuperDARN HF radar in Blackstone, Virginia which commonly observes direct backscatter from decameter-scale irregularities within the region of ionosphere traversed by the ROTHR signal.

JF - American Geophysical Union Fall Meeting PB - American Geophysical Union CY - New Orleans, LA UR - https://agu.confex.com/agu/fm21/meetingapp.cgi/Paper/875589 ER - TY - Generic T1 - Simultaneous observations of mid-latitude Ionospheric Irregularities in HamSCI Personal Space Weather Station and SuperDARN radar T2 - SuperDARN Workshop Y1 - 2021 A1 - Joshi, Dev Raj A1 - Frissell, Nathaniel A. A1 - Liles, William A1 - Vierinen, Juha JF - SuperDARN Workshop PB - SANSA CY - Virtual UR - https://www.sansa.org.za/events-outreach/superdarn-workshop-2021/ ER -