Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm11a1166l&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM11A-1166
Physics
2471 Plasma Waves And Instabilities, 2700 Magnetospheric Physics, 2730 Magnetosphere: Inner, 2744 Magnetotail
Scientific paper
Geotail observations of proton temperature anisotropies in the magnetotail show a sharp upper bound at - 1 > 0 vs. where and // are directions in reference to ambient magnetic field and . The same upper bound has been observed in the magnetosheath, in the solar wind, and in the outer magnetosphere. Hybrid simulations have shown that this constraint is due to proton scattering by the electromagnetic proton cyclotron anisotropy instability. Our observations show a spread of three decades in domain and effectively extends previous results to high region. The bi-Maxwellian assumption is tested and found to be valid in high region while it breaks down in low regions, thus it holds in the plasma sheet, which is a necessary condition for above theory and simulations. For the opposite sense of proton temperature anisotropy, the upper bound of 1- > 0 vs. in = [1,10] domain is also shown; simulations predict that this constraint is due to scattering by the electromagnetic proton firehose instability. However, waves excited by these temperature anisotropies are often obscured by background fluctuations.
Gary Peter S.
Kepko Larry
Lin Te-Tsung
Mukai Tadashi
Spence Harlan
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