TY - CPAPER KW - Amateur Radio KW - Citizen Science KW - Ham Radio KW - HF propagation KW - ionosphere KW - solar eclipse AU - N. Frissell AU - J. Katz AU - S. Gunning AU - J. Vega AU - A. Gerrard AU - G. Earle AU - M. Moses AU - M. West AU - J. Huba AU - P. Erickson AU - E. Miller AU - R. Gerzoff AU - W. Liles AU - H. Silver AB - On 21 August 2017, a total solar eclipse traversed the continental United States and caused large-scale changes in ionospheric densities. These were detected as changes in medium- and high-frequency radio propagation by the Solar Eclipse QSO Party citizen science experiment organized by the Ham Radio Science Citizen Investigation (hamsci.org). This is the first eclipse-ionospheric study to make use of measurements from a citizen-operated, global-scale HF propagation network and develop tools for comparison to a physics-based model ionosphere. Eclipse effects were observed ±0.3 hr on 1.8 MHz, ±0.75 hr on 3.5 and 7 MHz, and ±1 hr on 14 MHz and are consistent with eclipse-induced ionospheric densities. Observations were simulated using the PHaRLAP raytracing toolkit in conjunction with the eclipsed SAMI3 ionospheric model. Model results suggest 1.8, 3.5, and 7 MHz refracted at h≥125 km altitude with elevation angles θ≥22°, while 14 MHz signals refracted at h < 125 km with elevation angles θ < 10°. BT - Fall AGU C1 -

2018_AGU_Frissell_Eclipse.pdf

CY - Washington, DC DA - 12/2018 LA - eng N2 - On 21 August 2017, a total solar eclipse traversed the continental United States and caused large-scale changes in ionospheric densities. These were detected as changes in medium- and high-frequency radio propagation by the Solar Eclipse QSO Party citizen science experiment organized by the Ham Radio Science Citizen Investigation (hamsci.org). This is the first eclipse-ionospheric study to make use of measurements from a citizen-operated, global-scale HF propagation network and develop tools for comparison to a physics-based model ionosphere. Eclipse effects were observed ±0.3 hr on 1.8 MHz, ±0.75 hr on 3.5 and 7 MHz, and ±1 hr on 14 MHz and are consistent with eclipse-induced ionospheric densities. Observations were simulated using the PHaRLAP raytracing toolkit in conjunction with the eclipsed SAMI3 ionospheric model. Model results suggest 1.8, 3.5, and 7 MHz refracted at h≥125 km altitude with elevation angles θ≥22°, while 14 MHz signals refracted at h < 125 km with elevation angles θ < 10°. PB - American Geophysical Union Meeting PP - Washington, DC PY - 2018 T2 - Fall AGU TI - Modeling Amateur Radio Soundings of the Ionospheric Response to the 2017 Great American Eclipse UR - https://agu.confex.com/agu/fm18/meetingapp.cgi/Paper/418915 ER -