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Titolo:
ELECTRON-PLASMA ENVIRONMENT AT COMET GRIGG-SKJELLERUP - GENERAL OBSERVATIONS AND COMPARISON WITH THE ENVIRONMENT AT COMET HALLEY
Autore:
REME H; MAZELLE C; SAUVAUD JA; DUSTON C; FROMENT F; LIN RP; ANDERSON KA; CARLSON CW; LARSON DE; KORTH A; CHAIZY P; MENDIS DA;
Indirizzi:
UPS,CNRS,CTR ETUD SPATIALE,9 AVE COLONEL ROCHE F-31400 TOULOUSE FRANCE ESA,ESTEC,DEPT SPACE SCI NOORDWIJK NETHERLANDS UNIV CALIF SAN DIEGO,DEPT ELECT ENGN & COMP SCI LA JOLLA CA 92093 UNIV CALIF BERKELEY,SPACE SCI LAB BERKELEY CA 94720 MAX PLANCK INST AERON W-3411 KATLENBURG DUHM GERMANY
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A12, volume: 98, anno: 1993,
pagine: 20965 - 20976
SICI:
2169-9380(1993)98:A12<20965:EEACG->2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLAR-WIND INTERACTION; MAGNETIC-FIELD OBSERVATIONS; PILE-UP REGION; GIACOBINI-ZINNER; BOW SHOCK; GIOTTO; P/HALLEY; IONS; BOUNDARIES; UPSTREAM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
H. Reme et al., "ELECTRON-PLASMA ENVIRONMENT AT COMET GRIGG-SKJELLERUP - GENERAL OBSERVATIONS AND COMPARISON WITH THE ENVIRONMENT AT COMET HALLEY", J GEO R-S P, 98(A12), 1993, pp. 20965-20976

Abstract

The three-dimensional electron spectrometer of the Reme plasma analyzer-complete positive ion, electron and ram negative ion measurements near comet Halley (RPA-COPERNIC) experiment aboard the Giotto spacecraft, although damaged during the comet Halley encounter in March 1986, has provided very new results during the encounter on July 10, 1992, with the weakly active comet Grigg-Skjellerup (G-S). The main characteristic features of the highly structured interaction region extending from approximately 26,500 km inbound to approximately 37,200 km outboundare: (1) a broad inbound ''bow wave transition'', (2) a cometosheath characterized by strong oscillations of the electron fluxes with peak-to-valley ratios up to 20:1; the levels of oscillations are much larger and generally more coherent than at comet Halley or at comet Giacobini-Zinner, despite the much lower neutral ps production rate, (3) a ''mystery'' region, identified by significant fluxes of hundreds of eV electrons, and a ''mysterious' transition, about halfway between the bow wave transition/bow shock regions; they are observed as for comet Halley, confirming their large importance in the solar wind-comet interaction at 1 AU, (4) an inner region which coincides with the magnetic pileup region; at closest approach, the cold cometary electron fluxes display a prominent maximum, and (5) a sharp outbound bow shock and itspossibily associated electron foreshock. These results are compared to the results obtained by the same instrument during the Giotto comet Halley fly-by. Despite the large difference in the size of the interaction regions (approximately 60,000 km for G-S, approximately 2000,000 km for Halley) due to 2 orders of magnitude difference in cometary neutral ps production rate, there are striking similarities in the solar wind interactions with the two comets.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 23:05:36