Ring current dynamics and plasma sheet sources

Details Ring current dynamics and plasma sheet sources Ring current dynamics and plasma sheet sources

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.217..233l&link_type=abstract

In ESA Achievements of the Intern. Magnetospheric Study (IMS) p 233-242 (SEE N85-24544 14-46)

Physics

Current Sheets, Magnetic Storms, Plasma Dynamics, Ring Currents, Geomagnetic Tail, Helium Ions, Oxygen Ions, Plasma Decay, Plasma Loss, Plasma-Particle Interactions

Scientific paper

The source of the energized plasma that forms in geomagnetic storm ring currents, and ring current decay are discussed. The dominant loss processes for ring current ions are identified as charge exchange and resonant interactions with ion-cyclotron waves. Ring current ions are not dominated by protons. At L4 and energies below a few tens of keV, O+ is the most abundant ion, He+ is second, and protons are third. The plasma sheet contributes directly or indirectly to the ring current particle population. An important source of plasma sheet ions is earthward streaming ions on the outer boundary of the plasma sheet. Ion interactions with the current across the geomagnetic tail can account for the formation of this boundary layer. Electron interactions with the current sheet are possibly an important source of plasma sheet electrons.

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