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Titolo:
The origin and development of the May 1997 magnetic cloud
Autore:
Webb, DF; Lepping, RP; Burlaga, LF; DeForest, CE; Larson, DE; Martin, SF; Plunkett, SP; Rust, DM;
Indirizzi:
Boston Coll, Inst Sci Res, Chestnut Hill, MA 02167 USA Boston Coll Chestnut Hill MA USA 02167 i Res, Chestnut Hill, MA 02167 USA Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA Johns Hopkins Univ Laurel MD USA 20723 ppl Phys Lab, Laurel, MD 20723 USA NASA, Goddard Space Flight Ctr, USRA, Extraterr Phys Lab, Greenbelt, MD 20771 USA NASA Greenbelt MD USA 20771 , Extraterr Phys Lab, Greenbelt, MD 20771 USA Helio Res Inc, La Crescenta, CA 91214 USA Helio Res Inc La Crescenta CA USA 91214 s Inc, La Crescenta, CA 91214 USA Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA 94720 Sci Lab, Berkeley, CA 94720 USA Stanford Univ, Ctr Space Sci & Astrophys, Stanford, CA 94305 USA Stanford Univ Stanford CA USA 94305 i & Astrophys, Stanford, CA 94305 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 AFRL, VSBS, Hanscom AFB, MA 01731 USA AFRL Hanscom AFB MA USA 01731AFRL, VSBS, Hanscom AFB, MA 01731 USA Univ Space Res Assoc, Naval Res Lab, Washington, DC USA Univ Space Res Assoc Washington DC USA Naval Res Lab, Washington, DC USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A12, volume: 105, anno: 2000,
pagine: 27251 - 27259
SICI:
0148-0227(200012)105:A12<27251:TOADOT>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
CORONAL MASS EJECTION; WIND SPACECRAFT; JANUARY 1997; FIELDS; PLASMA; LASCO; LOOP;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Webb, DF Boston Coll, Inst Sci Res, Chestnut Hill, MA 02167 USA Boston Coll Chestnut Hill MA USA 02167 estnut Hill, MA 02167 USA
Citazione:
D.F. Webb et al., "The origin and development of the May 1997 magnetic cloud", J GEO R-S P, 105(A12), 2000, pp. 27251-27259

Abstract

A complete halo coronal mass ejection (CME) was observed by the SOHO Large-Angle and Spectrometric Coronagraph (LASCO) coronagraphs on May 12, 1997. It was associated with activity near Sun center, implying that it was aimedearthward. Three days later on May 15 an interplanetary shock and magneticcloud/flux rope transient was detected at the Wind spacecraft 190 R-E upstream of Earth. The long enduring southward magnetic fields associated with these structures triggered a geomagnetic storm. The CME was associated witha small coronal arcade that formed over a filament eruption with expandingdouble ribbons in Ha emission. The flare was accompanied by a circular EUVwave, and the arcade was flanked by adjacent dimming regions. We surmise that these latter regions marked the feet of a flux rope that expanded earthward into the solar wind and was observed as the magnetic cloud at Wind. Totest this hypothesis we determined key parameters of the solar structures on May 12 and compared them with the modeled flux rope parameters at Wind on May 15. The measurements are consistent with the flux rope originating ina large coronal structure linked to the erupting filament, with the opposite-polarity feet of: the rope terminating in the depleted regions. However,bidirectional electron streaming was not observed within the cloud itself,suggesting that there is not always a good correspondence between such flows and ejecta.

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Documento generato il 09/08/20 alle ore 23:38:56