Solar rotation period driven modulations of plasmaspheric density and convective electric field in the inner magnetosphere

TitleSolar rotation period driven modulations of plasmaspheric density and convective electric field in the inner magnetosphere
Publication TypeJournal Article
Year of Publication2019
AuthorsThaller, SA, Wygant, JR, Cattell, CA, Breneman, AW, Tyler, E, Tian, S, Engel, A, De Pascuale, S, Kurth, WS, Kletzing, CA, Tears, J, Malaspina, DM
JournalJournal of Geophysical Research: Space Physics
Date Published02/2019
Keywordsconvection electric field; inner magnetosphere; Plasmapause; plasmasphere; solar rotation; Van Allen Probes
AbstractThis paper presents the first analysis of Van Allen Probes measurements of the cold plasma density and electric field in the inner magnetosphere to show that intervals of strong modulation at the solar rotation period occur in the locations of the outer plasmasphere and plasmapause (~0.7 RE peak‐to‐peak), in the large‐scale electric field (~0.24 mV/m peak‐to‐peak), and in the cold plasma density (~250 cm‐3 – ~70 cm‐3 peak‐to‐peak). Solar rotation modulation of the inner magnetosphere is more apparent in the declining phase of the solar cycle than near solar maximum. The periodicities in these parameters are compared to solar EUV irradiance, solar wind dawn‐dusk electric field, and Kp. The variations in the plasmapause location at the solar rotation period anti‐correlate with solar wind electric field, magnetospheric electric field, and Kp, but not with EUV irradiance, indicating that convective erosion is the dominant physical process controlling the plasmapause at these timescales.
URLhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2018JA026365
DOI10.1029/2018JA026365
Short TitleJ. Geophys. Res. Space Physics


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