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Titolo:
LASCO OBSERVATIONS OF AN EARTH-DIRECTED CORONAL MASS EJECTION ON MAY 12, 1997
Autore:
PLUNKETT SP; THOMPSON BJ; HOWARD RA; MICHELS DJ; STCYR OC; TAPPIN SJ; SCHWENN R; LAMY PL;
Indirizzi:
USN,RES LAB,EO HULBURT CTR SPACE RES WASHINGTON DC 20375 ASTRON SPATIALE LAB F-13376 MARSEILLE 12 FRANCE MAX PLANCK INST AERON D-37189 KATLENBURG DUHM GERMANY UNIV BIRMINGHAM,SCH PHYS & ASTRON BIRMINGHAM B15 2TT W MIDLANDS ENGLAND NASA,GODDARD SPACE FLIGHT CTR,SPACE APPLICAT CORP GREENBELT MD 00000 USN,RES LAB,COMPUTAT PHYS INC WASHINGTON DC 00000 USN,RES LAB,UNIV SPACE RES ASSOC WASHINGTON DC 00000
Titolo Testata:
Geophysical research letters
fascicolo: 14, volume: 25, anno: 1998,
pagine: 2477 - 2480
SICI:
0094-8276(1998)25:14<2477:LOOAEC>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
8
Recensione:
Indirizzi per estratti:
Citazione:
S.P. Plunkett et al., "LASCO OBSERVATIONS OF AN EARTH-DIRECTED CORONAL MASS EJECTION ON MAY 12, 1997", Geophysical research letters, 25(14), 1998, pp. 2477-2480

Abstract

Coronal mass ejections (CMEs) that occur near the center of the solardisk are most likely to impact Earth. Detection of such events as 'halos' in white-light coronagraphs has been somewhat controversial in recent years. We present observations from the LASCO coronagraphs on SOHO that provide convincing evidence of the detection of an Earth-directed CME on May 12, 1997. The event began at about 04:35 UT and propagated outwards from the Sun with a projected speed of around 250 km s(-1). Using some reasonable assumptions about the geometry of the CME, we estimate the true speed to be around 600 km s(-1). The onset of the event in LASCO is coincident (to within measurement uncertainties) with an eruptive event detected in extreme ultraviolet observations of the solar disk by the SOHO EIT. This is the first reported observation of a halo CME at projected distances greater than 10 R-., with a clearly identifiable solar origin. We discuss the possibility that at least some of the enhanced brightness observed by LASCO may be due to a compressional wave propagating in the corona.

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Documento generato il 20/09/20 alle ore 02:48:02