posted on 2025-11-25, 16:50authored byKeshav R Tripathi, T Imamura, RK Choudhary, Beatriz Sánchez–Cano, KM Ambili
<p dir="ltr">This study investigates the potential impact of Solar Energetic Particles (SEPs) on the V0 layer of the Venus ionosphere. Electron density profiles obtained from radio occultation experiments conducted by the Venus Express (VEX) and Akatsuki missions were utilized for this purpose. Background data from the Analyzer of Space Plasma and EneRgetic Atoms (ASPERA‐4) aboard VEX were used to detect SEP events. Additionally, observations from the Space Environment Monitor (SEM) suite onboard the Geostationary Operational Environmental Satellite (GOES) during alignments of Venus, Earth, and the Sun were also considered. Our findings indicate that while SEPs may contribute to the formation of the V0 layer, they are not the main driving force in the Venusian ionosphere.</p>
Funding
Japan Society for the promotion of Science
Solar wind influence on terrestrial planets' upper atmospheres: unveiling their close interaction
The Akatsuki radio occultation data are available on the Japan Aerospace Exploration Agency's (JAXA) data archival portal (Murakami et al., 2017, https://www.darts.isas.jaxa.jp/planet/project/akatsuki/rs.html.en). Data for Venus Express radio science payloads are available at the European Space Agency's data archival portal (https://archives.esac.esa.int/psa/ftp/VENUS-EXPRESS/VRA/). ASPERA-4 plots are available at (https://www.umea.irf.se/~peje/vex/hk/bkg/). The information about SEP events is taken from Rotti and Martens (2023, https://dataverse.harvard.edu/dataset.xhtml?persistentId=doi:10.7910/DVN/DZYLHK) and CCMC DONKI's website (https://kauai.ccmc.gsfc.nasa.gov/DONKI/search/).