Electron structures in the cusp/cleft region observed by DE 2 satellite

Details Electron structures in the cusp/cleft region observed by DE 2 satellite Electron structures in the cusp/cleft region observed by DE 2 satellite

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100.1597e&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. A2, p. 1597-1610

Physics

3

Earth Ionosphere, Electron Energy, Electronic Spectra, Electrons, Magnetic Field Reconnection, Magnetopause, Magnetosheath, Polar Cusps, Current Distribution, Dynamics Explorer Satellites, Field Aligned Currents, Geomagnetism, International Sun Earth Explorers, Interplanetary Magnetic Fields, Solar Wind

Scientific paper

Narrow enhancements of electron precipitation, with energy and flux well above typical values, have been observed with Dynamics Explorer 2 (DE 2) in the cusp/cleft region. The electron flux in the energy range 0.2-1 keV was 2 orders of magnitude higher in these structures than in the magnetosheath and were seen in approximaetly 80% of DE 2 cusp crossings at ionospheric altitudes. Typically, there was more than one electron structure in each cusp crossing. The position of these structures showed a systematic variation: for poleward ion dispersion (energy decreases with increasing latitude), electron structures were seen more often on the equatorial boundary of the cusp, while for equatorward ion dispersion (energy decreases with decreasing latitude), electron structures were more often seen on the poleward boundary. This suggests that the electron structures are associated with newly reconnected field lines. The electron spectra suggest that field-aligned acceleration processes could produce the electron structures, first near the boundary of the cusp/cleft during the reconnection of field lines and then in the cusp/cleft during the motion of reconnected flux tubes through the polar ionosphere.

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