TY - CONF T1 - High Frequency Communications Response to Solar Activity in September 2017 as Observed by Amateur Radio Networks T2 - HamSCI Workshop 2019 Y1 - 2019 A1 - Nathaniel A. Frissell A1 - Joshua S. Vega A1 - Evan Markowitz A1 - Andrew J. Gerrard A1 - William D. Engelke A1 - Philip J. Erickson A1 - Ethan S. Miller A1 - R. Carl Luetzelschwab A1 - Jacob Bortnik AB -

Numerous solar flares and coronal mass ejection‐induced interplanetary shocks associated with solar active region AR12673 caused disturbances to terrestrial high‐frequency (HF, 3–30 MHz) radio communications from 4–14 September 2017. Simultaneously, Hurricanes Irma and Jose caused significant damage to the Caribbean Islands and parts of Florida. The coincidental timing of both the space weather activity and hurricanes was unfortunate, as HF radio was needed for emergency communications. This paper presents the response of HF amateur radio propagation as observed by the Reverse Beacon Network and the Weak Signal Propagation Reporting Network to the space weather events of that period. Distributed data coverage from these dense sources provided a unique mix of global and regional coverage of ionospheric response and recovery that revealed several features of storm time HF propagation dynamics. X‐class flares on 6, 7, and 10 September caused acute radio blackouts during the day in the Caribbean with recovery times of tens of minutes to hours, based on the decay time of the flare. A severe geomagnetic storm with Kpmax = 8+ and SYM‐Hmin = −146 nT occurring 7–10 September wiped out ionospheric communications first on 14 MHz and then on 7 MHz starting at ∼1200 UT 8 September. This storm, combined with affects from additional flare and geomagnetic activity, contributed to a significant suppression of effective HF propagation bands both globally and in the Caribbean for a period of 12 to 15 days.

JF - HamSCI Workshop 2019 PB - HamSCI CY - Cleveland, OH ER -