Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm52b..05s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM52B-05
Physics
[2728] Magnetospheric Physics / Magnetosheath, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions
Scientific paper
We present a multi-spacecraft statistical study of the terrestrial magnetosheath, focusing on dawn-dusk asymmetry in plasma parameters and properties of low frequency plasma waves. The study is based on conjunction events when Cluster and THEMIS spacecraft were simultaneously sampling opposite flanks of the magnetosheath. We show that close to the bow shock, a significant asymmetry is observed in plasma ion temperature and its anisotropy. As the plasma flow approaches closer to the magnetopause, the plasma properties become more homogeneous. We demonstrate that the asymmetry is due to the difference in plasma heating at the bow shock, as it is clearly correlated with the instantaneous location of the quasi-perpendicular shock. We also investigate the asymmetry and spatial distribution of the occurrence of mirror and ion-cyclotron waves in different regions of the magnetosheath. The ion-cyclotron waves are found to be the dominant low frequency mode in the magnetosheath region close to to the bow shock. Mirror mode structures are more frequently observed deeper inside the magnetosheath from intermediate radial distances to the magnetopause. Statistical results as well as several examples of joint Cluster-THEMIS observations are shown.
Escoubet Christophe P.
Soucek Jiri
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