Initial Review of the October 2023 and April 2024 Grape Eclipse Data

The Great Radio Amateur Propagation Experiment (GRAPE) is a network of doppler receivers that function as a distributed multi-static radar. The Grape network is a part of the HamSCI Personal Space Weather Station (PSWS) project, which includes ground based receivers and magnetometers deployed by amateur radio operators and citizen scientists. The Grape receivers use a GPS disciplined oscillator to measure the Doppler shift of the NIST time and frequency broadcast from WWV in Fort Collins, Colorado. Grape receivers recorded the 10 MHz signal during the 2023 October annular eclipse and an updated version of the receiver was deployed to expand the network and collect 5, 10, and 15 MHz signals during the 2024 April total solar eclipse. We present initial data and results of the 2023 and 2024 eclipses and focus on the following research questions: (1) is the ionospheric response symmetric with respect to eclipse onset and recovery, (2) is an eclipse response similar to typical day to night variations, (3) is multipath HF mode-splitting in the post-eclipse interval similar to dawn events, and (4) how do the responses of the two eclipses differ?