The Statistical Study of Plasma Sheet Boundary Layer in the Tail and in the Middle Altitude Regions.

Details The Statistical Study of Plasma Sheet Boundary Layer in the Tail and in the Middle Altitude Regions. The Statistical Study of Plasma Sheet Boundary Layer in the Tail and in the Middle Altitude Regions.

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11b0820g&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM11B-0820

Physics

2748 Magnetotail Boundary Layers

Scientific paper

ion beams (beamlets) observed by Interball-Tail and Interball- Auroral satellites. In the both data sets beamlets manifest themselves as bursty plasma events with duration ≈ 60s and ion energies about several keV accompanied by cold (200-300eV) electrons. We used an epoch superposition technique to define statistically the beamlet registration zones in the geomagnetic tail (X ≈ -25Re) as well as in the auroral region. We have found that in the Earth magnetotail beamlets are localized at about 0.6 Re above plasma sheet (PS) boundary. This distance corresponds to the invariant latitude interval of ≈ 0.5o from high-latitude PS boundary. The same statistical analysis of Interball-Auroral data has shown that at the middle altitudes beamlets are registered also poleward from high-latitude PS boundary at a 0.8o latitudinal distance, that is in good agreement with Interball-tail data. We made also a statistical analysis of beamlet's energy versus latitude for both Interball-Auroral and Interball-Tail data. The analysis has shown the similar beamlet energy dispersion in the middle-altitude and in the tail regions. When interplanetary magnetic field (IMF) was mostly southward beamlet energies increase with latitude while for northward IMF the inverse beamlet energy dispersion is observed.

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