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Titolo:
SECTOR BOUNDARY TRANSFORMATION BY AN OPEN MAGNETIC CLOUD
Autore:
CROOKER NU; MCALLISTER AH; FITZENREITER RJ; LINKER JA; LARSON DE; LEPPING RP; SZABO A; STEINBERG JT; LAZARUS AJ; MIKIC Z; LIN RP;
Indirizzi:
BOSTON UNIV,CTR SPACE PHYS,725 COMMONWEALTH AVE BOSTON MA 02215 HELIO RES LE CRESCENTA CA 00000 NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB GREENBELT MD 20771 SCI APPLICAT INT CORP SAN DIEGO CA 92121 UNIV CALIF BERKELEY,SPACE SCI LAB BERKELEY CA 94720 MIT,CTR SPACE RES CAMBRIDGE MA 02139
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A11, volume: 103, anno: 1998,
pagine: 26859 - 26868
SICI:
2169-9380(1998)103:A11<26859:SBTBAO>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
HELIOSPHERIC CURRENT SHEET; CORONAL MASS EJECTIONS; SOLAR-WIND; ELECTRONS; FIELD; STREAMER; TOPOLOGY; RECONNECTION; EVENTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
N.U. Crooker et al., "SECTOR BOUNDARY TRANSFORMATION BY AN OPEN MAGNETIC CLOUD", J GEO R-S P, 103(A11), 1998, pp. 26859-26868

Abstract

A magnetic cloud observed by the Wind spacecraft on February 8, 1995,was remarkable for its impact on the interplanetary sector structure. The magnetic field data imply that the cloud occurred in the middle of a sector and that the arrival of the following sector boundary on February 10 coincided with the arrival time predicted from the corresponding source surface map. The electron heat flux data, however, give incontrovertible evidence that instead the cloud brought the sector boundary, well ahead of the predicted arrival time. The electron heat fluxdata show little counterstreaming within the cloud, indicating predominantly open helical field lines. Under the assumption that the cloud originally had the form of a closed flux rope loop with legs rooted tothe Sun, observational constraints dictate that the sector boundary was displaced not because it was pushed aside by the cloud but because reconnection in the leading leg opened field lines there, creating a topological change spanning 45 degrees of heliographic longitude. The solar source of the cloud was deduced from an associated eruptive arcade event extending northeastward from an active region in Yohkoh soft Xray data on February 4. On February 8, the same active region was thesource of impulsive energetic electron events observed at Wind duringa brief counterstreaming interval, consistent with magnetic connection in the leading leg at that time. The cloud's helicity matches that predicted from the skew of the arcade fields in the February, 4 X ray event, but the predicted alignment of the arcade and cloud axes was offby 35 degrees. We use an MHD model with boundary conditions derived from solar magnetograms to illustrate the tilted arcade configuration in the corona that gave rise to the magnetic cloud and the lesser tilt of the heliospheric current sheet stemming from it.

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Documento generato il 15/07/20 alle ore 08:23:56