Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...580l.177w&link_type=abstract
The Astrophysical Journal, Volume 580, Issue 2, pp. L177-L180.
Astronomy and Astrophysics
Astronomy
17
Sun: Activity, Sun: Flares, Sun: Magnetic Fields
Scientific paper
In this Letter, we present the evidence of rapid disappearance of a small sunspot associated with a M2.4 flare, which occurred in NOAA Active Region 9830, at 2106 UT, on 2002 February 20. The sunspot, in the size of about 45 arcsec2, completely disappeared in about 60 minutes, coinciding with the onset of the flare. The magnetic flux of this sunspot disappeared in the similar timescale. Furthermore, we found that the disappearing sunspot is located near the edge of the main hard X-ray source observed by RHESSI. This hard X-ray source is located in the magnetic neutral line dividing the disappearing spot and the opposite polarity flux. Two possible explanations are offered: (1) the disappearing sunspot is due to the rapid magnetic reconnection and subsequent submergence; (2) the disappearing sunspot represents impulsive emergence and detachment of a magnetic ``bubble.''
Deng Nimao
Ji Haisheng
Liu Chang
Qiu Jiong
Schmahl Edward J.
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