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Titolo:
ULF wave damping in the auroral acceleration region
Autore:
Fedorov, E; Pilipenko, V; Engebretson, TJ;
Indirizzi:
Russian Acad Sci, Inst Phys Earth, Moscow 123810, Russia Russian Acad SciMoscow Russia 123810 Phys Earth, Moscow 123810, Russia Augsburg Coll, Dept Phys, Minneapolis, MN 55454 USA Augsburg Coll Minneapolis MN USA 55454 pt Phys, Minneapolis, MN 55454 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A4, volume: 106, anno: 2001,
pagine: 6203 - 6212
SICI:
0148-0227(20010401)106:A4<6203:UWDITA>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIELD LINE RESONANCES; ALFVEN WAVES; GEOMAGNETIC-PULSATIONS; MAGNETOSPHERE; IONOSPHERE; MECHANISMS; REFLECTION; ARCS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Fedorov, E Russian Acad Sci, Inst Phys Earth, B Gruzinskaya 10, Moscow 123810, Russia Russian Acad Sci B Gruzinskaya 10 Moscow Russia 123810 Russia
Citazione:
E. Fedorov et al., "ULF wave damping in the auroral acceleration region", J GEO R-S P, 106(A4), 2001, pp. 6203-6212

Abstract

The width of a resonant peak in the spatial distribution of the ULF Pc5 pulsation amplitude at high latitudes is controlled by the dominant dissipation mechanism of Alfven waves in the ionosphere-magnetosphere system. Among possible mechanisms, mostly Joule dissipation and dispersive effects are considered to terminate the growth and narrowing of a resonant peak pumped byan external source. We estimate the width of the resonance which may be provided by the field-aligned electric field in a thermal, mirror-confined collisionless plasma. We consider a simple case, in which a potential drop isconfined within a narrow region above the ionosphere, called the auroral acceleration region. Theoretical estimates show that the mirror-force mechanism can dominate over the ionospheric dissipation and dispersive effects inauroral regions with a sufficiently large field-aligned potential drop. Therefore ground-based monitoring of the resonance width (e.g., with the gradient method) may be used as an indicator of the occurrence of large-scale parallel electric fields in the outer magnetosphere.

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Documento generato il 05/04/20 alle ore 07:10:56