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Titolo:
MEASUREMENTS OF HOT PLASMAS IN THE MAGNETOSPHERE OF JUPITER
Autore:
LANZEROTTI LJ; ARMSTRONG TP; MACLENNAN CG; SIMNETT GM; CHENG AF; GOLD RE; THOMSON DJ; KRIMIGIS KSM; ANDERSON KA; HAWKINS SE; PICK M; ROELOF EC; SARRIS ET; TAPPIN SJ;
Indirizzi:
AT&T BELL LABS MURRAY HILL NJ 07974 UNIV KANSAS LAWRENCE KS 66045 UNIV BIRMINGHAM BIRMINGHAM B15 2TT W MIDLANDS ENGLAND JOHNS HOPKINS UNIV,APPL PHYS LAB LAUREL MD 20742 UNIV CALIF BERKELEY BERKELEY CA 94720 OBSERV PARIS F-92190 MEUDON FRANCE UNIV THRACE XANTHI GREECE
Titolo Testata:
Planetary and space science
fascicolo: 11-12, volume: 41, anno: 1993,
pagine: 893 - 917
SICI:
0032-0633(1993)41:11-12<893:MOHPIT>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
JOVIAN MAGNETOSPHERE; VOYAGER SPACECRAFT; COROTATION LAG; BOW SHOCK; MODEL; ENVIRONMENT; CONVECTION; UPSTREAM; IONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
L.J. Lanzerotti et al., "MEASUREMENTS OF HOT PLASMAS IN THE MAGNETOSPHERE OF JUPITER", Planetary and space science, 41(11-12), 1993, pp. 893-917

Abstract

This paper presents an overview of a number of the principal findingsregarding the hot plasmas (E greater than or similar to 50 keV) in Jupiter's magnetosphere by the HI-SCALE instrument during the encounter of the Ulysses spacecraft with the planet in February 1992. The hot plasma ion fluxes measured by HI-SCALE in the dayside magnetosphere are similar to those measured in the same energy range in this region by the Voyager spacecraft in 1979. Within the dayside plasma sheet, the hot-ion energy densities are comparable with, or larger than, the magnetic field energy densities; these hot ions are found to corotate at about one-half the planetary corotational speed. For ions of energies greater than or similar to 500 keV/nucleon, the protons contributed from 50-60% to as much as 80% of the energy content of these plasmas. Strong, magnetic-field-aligned streaming was found for both the ions and electrons in the high-latitude duskside magnetosphere. The ion and electron pitch-angle distributions could be characterized by cos25 a throughout many of the high anisotropy intervals of the outbound pass. Thereis some evidence in the ion pitch-angle distributions for a corotational component in the hot plasmas at high Jovian latitudes. While thereare limitations owing to the finite geometries of the detector telescope systems on the determination of the angular spreads of the ion andelectron beams. the measurements show that there are intervals when the particle distributions are not bidirectional. At such times, locally the hot plasmas could be carrying currents of approximately 10(-4) muAm-2. The temporal variations in the streaming electron fluxes are substantially larger than the variations measured for the fluxes that are more locally mirroring. The temporal variations contain periodicities that may correspond to hydromagnetic wave frequencies in the magnetosphere as well as to larger scale motions of magnetospheric plasmas. On nearly half of the days for about a 130 day interval around the timeof the Ulysses encounter with the planet, particles of Jovian origin were measured in the interplanetary medium. An event discussed herein shows evidence of an energy dependence of the particle release processfrom the planetary magnetosphere into the interplanetary medium.

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Documento generato il 04/12/20 alle ore 22:23:42