Electron fluxes in the near-Earth magnetotail.

Details Electron fluxes in the near-Earth magnetotail. Electron fluxes in the near-Earth magnetotail.

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999czjph..49..607s&link_type=abstract

Czech. J. Phys., Vol. 49, No. 4a, p. 607 - 624

Physics

Earth Magnetosphere: Plasma

Scientific paper

In the geomagnetic tail, enhanced electron fluxes are observed mainly in the plasma sheet and in the plasma sheet boundary layer. The authors use the data of the Interball-tail probe to study the regions of electron fluxes across the near-Earth magnetotail, up to distances of 30 RE. The Interball orbit allows to scan the tail in both YGSM and ZGSM coordinates, from low to high latitudes. The spatial distribution of enhanced electron fluxes has been statistically estimated using the data collected during more than 2 years of satellite operation. We have found two basic regions of occurrence: (1) as expected, with a nearly 100% occurrence rate, the electron fluxes have been found in the plasma sheet region, up to 3-4 RE above the neutral sheet in the central part and up to 7-8 RE above the neutral sheet near the low-latitude boundary layer; (2) with about 10% occurrence rate, the authors observe enhanced electron fluxes near the high-latitude magnetopause. In each of these regions, they present a case study based on two point measurements onboard both main satellite and subsatellite. They characterize ion and electron plasma components and motion of observed boundaries. The low-latitude case can be interpreted as irregular flapping of the plasma sheet and its boundary layer. Near the high-latitude magnetopause, the case study shows isolated plasma structures having the size comparable to the Earth's radius and moving with a velocity from several km/s up to several tens of km/s. These structures contain electrons with energies of several hundreds of eV, and their nature remains unclear.

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