Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm43c..01r&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SM43C-01
Physics
2730 Magnetosphere: Inner, 2744 Magnetotail, 2753 Numerical Modeling, 2764 Plasma Sheet, 2778 Ring Current
Scientific paper
It has been observed during magnetic storms that ions leaving the ionosphere near local midnight with energies less than a 100eV are detected a short time later with energies of 10's of keV in the plasma sheet and ring current. It is argued here that this rapid heating of ions may be due to a kinetic instability based on the work of C. O. Hines ( Planet. and Space Phys., 1963, pg. 239-246 ). Hines found that the gyro-energy Ep of an adiabatically earthward ExB drifting ion would be enhanced as it drifted through a magnetic gradient. One can show that this leads to an exponential increase in Ep with a time constant tau equal to the scale size L of the magnetic-field gradient divided by the ExB drift speed. The energy source is the cross-tail electric field. In order to obtain the required factor of 100 in energy growth the kinetic instability must be operative for at least 4.6 tau, which places a condition on the transit time through the region in which the magnetic-field gradient exists. Studies will be undertaken to determine under which conditions, if any, this instability has importance.
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