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Titolo:
Three-dimensional MHD simulations of the steady state magnetosphere with northward interplanetary magnetic field
Autore:
Guzdar, PN; Shao, X; Goodrich, CC; Papadopoulos, K; Wiltberger, MJ; Lyon, JG;
Indirizzi:
Univ Maryland, Inst Plasma Res, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 lasma Res, College Pk, MD 20742 USA Univ Maryland, Dept Astron, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 pt Astron, College Pk, MD 20742 USA Dartmouth Coll, Dept Phys & Astron, Wilder Lab 6127, Hanover, NH 03755 USADartmouth Coll Hanover NH USA 03755 ilder Lab 6127, Hanover, NH 03755 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A1, volume: 106, anno: 2001,
pagine: 275 - 287
SICI:
0148-0227(20010101)106:A1<275:TMSOTS>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUMERICAL-SIMULATION; EARTHS MAGNETOSPHERE; MARCH 9; SUBSTORM; ONSET; IMF; RECONNECTION; CONVECTION; MODEL; LONG;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Guzdar, PN Univ Maryland, Inst Plasma Res, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 College Pk, MD 20742 USA
Citazione:
P.N. Guzdar et al., "Three-dimensional MHD simulations of the steady state magnetosphere with northward interplanetary magnetic field", J GEO R-S P, 106(A1), 2001, pp. 275-287

Abstract

In the recent past, three-dimensional global MHD codes have successfully demonstrated that they are invaluable tools for simulating global magnetospheric phenomena. In this paper, using the Lyon-Fedder-Mobarry code, we present results on the spatial structure of the steady state of Earth's magnetosphere for northward interplanetary magnetic field (IMF). We have shown thatthe steady state tail length of the Earth's magnetosphere for northward IMF is short and that the three dimensional structure of the tail lobe is of concave shape. This is in contradiction to the results presented by Fedder and Lyon [1995]. Explanation for this discrepancy is given in this paper. By varying the simple time-independent solar wind velocity and interplanetary magnetic field, we present the parametric (power law) dependence of the geometrical aspects of the tail lobe on solar wind condition. In general, with higher solar wind velocity the radius of the tail lobe cross section is smaller and the tail length is longer. With higher northward IMF the whole tail lobe is smaller. These numerical studies have guided us in building analytical models based on global conservation constraints and force balance. We conclude that the lobe size is mainly determined by the solar wind velocity and the reconnection process in the cusp region which is affected by the magnitude of the IMF. We also show that the ionospheric effects are not significant in determining the lobe sire. The evolution history of the taillength for magnetotail to reach steady state is also presented in this paper. Emphasis is placed on the fact that the steady state is a dynamical steady state.

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Documento generato il 29/09/20 alle ore 04:35:31