Skip to Main content Skip to Navigation
Journal articles

Proton Temperature Anisotropies in the Venus Plasma Environment During Solar Minimum and Maximum

Abstract : The proton population in Venus' plasma environment is characterized during periods of solar minimum and maximum using data from a particle mass-energy spectrometer. Such characterizations at different levels of solar activity provides physical insight into solar-cycle-dependent plasma phenomena around the planet, for example mirror modes in the magnetosheath. Statistical distributions of proton bulk speeds and temperatures are generated using a previously developed method which applies Maxwellian fits to measurements of the protons' velocity distribution function. Spatial maps and probability-density histograms comparing the proton parameters between the two time periods are presented. The temperatures perpendicular (T) and parallel (T) to the background magnetic field are found to be 20%-35% lower during solar maximum. Though the overall distributions of the temperature ratio T/T do not change, the regions with higher anisotropy (T/T > 1) are found farther downstream from the bow shock during solar maximum than minimum. This is consistent with the previously observed growth of mirror modes during solar maximum and their decay during minimum.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03672063
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Thursday, May 19, 2022 - 10:29:01 AM
Last modification on : Monday, July 4, 2022 - 8:43:57 AM

File

JGR Space Physics - 2021 - Roj...
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution - NonCommercial - NoDerivatives 4.0 International License

Identifiers

Collections

Citation

Sebastián. Rojas Mata, Gabriella Stenberg Wieser, Yoshifumi Futaana, Alexander Bader, Moa Persson, et al.. Proton Temperature Anisotropies in the Venus Plasma Environment During Solar Minimum and Maximum. Journal of Geophysical Research: Space Physics, 2022, 127, ⟨10.1029/2021JA029611⟩. ⟨insu-03672063⟩

Share

Metrics

Record views

25

Files downloads

2