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Titolo:
On the spectrum of magnetosonic eigenoscillations of an axisymmetric magnetosphere
Autore:
Leonovich, AS; Mazur, VA;
Indirizzi:
Inst Solar Terr Phys, Irkutsk 664033, Russia Inst Solar Terr Phys Irkutsk Russia 664033 Phys, Irkutsk 664033, Russia
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A3, volume: 106, anno: 2001,
pagine: 3919 - 3927
SICI:
0148-0227(20010301)106:A3<3919:OTSOME>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIELD-LINE RESONANCES; STANDING ALFVEN WAVES; CAVITY MODES; DIPOLE MODEL; GUIDE MODES; EXCITATION; MAGNETOPAUSE; OSCILLATIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Leonovich, AS Inst Solar Terr Phys, POB 4026, Irkutsk 664033, Russia Inst Solar Terr Phys POB 4026 Irkutsk Russia 664033 Russia
Citazione:
A.S. Leonovich e V.A. Mazur, "On the spectrum of magnetosonic eigenoscillations of an axisymmetric magnetosphere", J GEO R-S P, 106(A3), 2001, pp. 3919-3927

Abstract

The structure of magnetosonic eigenoscillations of an axisymmetric magnetosphere in the direction across magnetic shells was determined within the WKB approximation. The spectrum of their eigenfrequencies was investigated numerically. The model of the medium assumes a dipole magnetic field and a two-dimensional Alfven velocity distribution in the meridional plane which takes into account abrupt changes of the Alfven velocity at the plasmapause and magnetopause. It is shown that eigenfrequencies are complex valued. The imaginary part of the frequency is a damping: decrement of the eigenoscillations associated with the escape of some of their energy to the solar wind. It is shown that in a dipole-like geomagnetic field in which field lines concentrated toward the origin of coordinates, the amplitude of magnetosonicoscillations increases from the magnetopause to the ionosphere. While the oscillations penetrating: deep into the magnetosphere from the solar wind or generated at the magnetospheric boundary have near the magnetopause a relatively small amplitude, as the Earth is approached, their amplitude carl reach a significant value for geometrical reasons.

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Documento generato il 01/04/20 alle ore 01:39:21