Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa31b..06e&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SA31B-06
Physics
5421 Interactions With Particles And Fields, 5443 Magnetospheres (2756), 6225 Mars, 7829 Kinetic Waves And Instabilities, 7836 Mhd Waves And Instabilities (2149, 2752, 6050)
Scientific paper
The interaction between the solar wind and the Martian ionosphere produces copious amounts of plasma waves and instabilities. We first review observations of low frequency (< 1 Hz) waves throughout the Martian system. We then focus specifically on new results regarding the high amplitude waves found in the magnetosheath region. The dayside magnetosheath waves are nonlinear (deltaB/|B| > 0.1) and are dominated by power near the local proton cyclotron frequency (~ 0.1 Hz). However, we also find intervals marked by strong spectral power at the local helium and oxygen gyrofrequencies. Some intervals also show strong bursts of wave activity bracketed by periods of relative calm; we speculate that these bursts could be related to plasma clouds detached from the Martian ionosphere. The nightside magnetosheath is comparatively quiet but intervals of ion cyclotron wave activity do exist.
Acuña Mario Humberto
Brain David Andrew
Cloutier Paul A.
Crider Dana Hurley
Espley Jared R.
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