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Titolo:
The termination shock: 1979-1995
Autore:
Whang, YC; Lu, JY; Burlaga, LF;
Indirizzi:
Catholic Univ Amer, Dept Mech Engn, Washington, DC 20064 USA Catholic UnivAmer Washington DC USA 20064 Engn, Washington, DC 20064 USA NASA, Goddard Space Flight Ctr, Extraterr Phys Lab, Greenbelt, MD 20771 USA NASA Greenbelt MD USA 20771 , Extraterr Phys Lab, Greenbelt, MD 20771 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A12, volume: 104, anno: 1999,
pagine: 28255 - 28262
SICI:
0148-0227(199912)104:A12<28255:TTS1>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLAR-WIND; OUTER HELIOSPHERE; INTERPLANETARY SHOCKS; PICKUP IONS; HELIOPAUSE; DISTANCE; HYDROGEN; MODEL; MOTION; GAS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Whang, YC Catholic Univ Amer, Dept Mech Engn, Washington, DC 20064 USA Catholic Univ Amer Washington DC USA 20064 ington, DC 20064 USA
Citazione:
Y.C. Whang et al., "The termination shock: 1979-1995", J GEO R-S P, 104(A12), 1999, pp. 28255-28262

Abstract

We study the varying location, jump condition, and shock speed of the termination shock in 1979-1995 taking into account the effects of pickup protons. Pickup protons and neutral hydrogen are calculated using a hot hydrogen model. Plasma and magnetic field data from Voyagers over a 17-year period from 1978 through 1994 are used as input. The steady state MHD equations areintegrated to extrapolate input data from the Voyager trajectory to the upstream of the termination shock. This study continues to show that the location of the termination shock is anticorrelated with the sunspot number, moving inward or outward during the rising or declining phase of the solar cycle. We expect that this anticorrelation would repeat itself during the solar cycle 23 in an extension of this study beyond 1995, and the result can predict the Voyager crossing of the termination shock. If the average location of the termination shock is at 79 AU, the pickup proton effects reduce the average shock strength from 3.87 to 3.15 and reduce the average temperature ratio of the solar wind protons from 378 to 42.1. We use the empirical formula of Whang and Burlaga [1999] to calculate the postshock temperature of pickup protons, the average temperature ratio of pickup protons across the termination shock is similar to 4.5.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 21:54:04