Alfvén Wave Modulation of Substorms and Outflowing O+ ions Observed by Cluster: Kinetic Features

Details Alfvén Wave Modulation of Substorms and Outflowing O+ ions Observed by Cluster: Kinetic Features Alfvén Wave Modulation of Substorms and Outflowing O+ ions Observed by Cluster: Kinetic Features

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm21c..07l&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM21C-07

Other

2431 Ionosphere/Magnetosphere Interactions (2736), 2471 Plasma Waves And Instabilities, 2736 Magnetosphere/Ionosphere Interactions

Scientific paper

The bulk parameter picture will now be expanded to provide a more comprehensive view of substorm dynamics in the geomagnetic tail. Phase space distributions of ions show presence of multiple component plasmas, H+ and O+. Both field-aligned unidirectional and bidirectional beams are observed at energies varying from a few hundred eV to ≈3 keV. The 2D cuts of the 3D distributions show very complex and highly time varying features. Extremely large gradients in the phase space occur with ions existing in one vperpendicular to quadrant and none in other quadrants. This yields large perpendicular to which can be falsely interpreted as flowing plasmas. What is actually happening is that the Cluster was remote sensing a nearby boundary. This is another example that shows using moments alone to characterize the plasma sheet can lead to misleading results. Using the 4 Cluster data, the current sheet thickness is estimated to be around ≈1000-2000 km. This thickness is comparable to the few keV ion Larmor radius. Both ionospheric and plasma sheet ions are observed in the current sheet indicating a strong MI coupling existed. These observations require kinetic interpretation and new kinetic models of substorms must be developed to explain them.

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