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Titolo:
Tailward electrons at the lobe-plasma sheet interface detected upon dipolarizations
Autore:
Fujimoto, M; Nagai, T; Yokokawa, N; Yamade, Y; Mukai, T; Saito, Y; Kokubun, S;
Indirizzi:
Tokyo Inst Technol, Dept Earth & Planetary Sci, Meguro, Tokyo 1528551, Japan Tokyo Inst Technol Meguro Tokyo Japan 1528551 eguro, Tokyo 1528551, Japan Fuji Res Inst, Chiyoda Ku, Tokyo 1018443, Japan Fuji Res Inst Tokyo Japan 1018443 Inst, Chiyoda Ku, Tokyo 1018443, Japan Inst Space & Astronaut Sci, Sagamihara, Kanagawa 229, Japan Inst Space & Astronaut Sci Sagamihara Kanagawa Japan 229 agawa 229, Japan
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A10, volume: 106, anno: 2001,
pagine: 21255 - 21262
SICI:
0148-0227(20011001)106:A10<21255:TEATLS>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETOTAIL RECONNECTION; MAGNETIC RECONNECTION; GEOTAIL OBSERVATIONS; BOUNDARY-LAYER; DYNAMICS; DISTRIBUTIONS; SIMULATIONS; PARTICLE; REGION; BEAMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Fujimoto, M Tokyo Inst Technol, Dept Earth & Planetary Sci, 2-12-1 Ookayama, Meguro, Tokyo 1528551, Japan Tokyo Inst Technol 2-12-1 Ookayama Meguro Tokyo Japan 1528551
Citazione:
M. Fujimoto et al., "Tailward electrons at the lobe-plasma sheet interface detected upon dipolarizations", J GEO R-S P, 106(A10), 2001, pp. 21255-21262

Abstract

We report on highly asymmetric spectra of electrons observed at the lobe-plasma sheet interface in the near-Earth (R < 15 R-E) magnetotail. The data were obtained as the Geotail spacecraft made the interface crossings when magnetic field dipolarizations were taking place. In the spectra, electrons in the 0.1 keV to a few keV energy range are seen to flow tailward, with their pitch angles highly collimated along the field lines. Energetic ion beams (> 10 keV) are occasionally detected flowing earthward counter to the above electrons. The large differences in the bulk flows result in an intensefield-aligned current (FAC) downward into the ionosphere. The estimated vertical thickness of the FAC layer is found to be comparable to the relevantion inertia length, leading us to propose that the tailward electrons sustain the downward FAC originating from the near-Earth X line driven by the Hall effects in magnetotail reconnection. Such a FAC structure is indeed shown by a three-dimensional Hall-MHD simulation to be located at the high-latitude edge of the plasma sheet. We also show the currents integrated over the Hall-FAC layer to be of significant amounts in the context of magnetosphere-ionosphere coupling.

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Documento generato il 30/05/20 alle ore 15:06:30