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CME ASSOCIATED WITH TRANSEQUATORIAL LOOPS AND A BALD PATCH FLARE
 

Summary: CME ASSOCIATED WITH TRANSEQUATORIAL LOOPS AND A BALD
PATCH FLARE
C. DELANNÉE1 and G. AULANIER2
1NASA/Goddard Space Flight Center, SOHO EAF, Mail Code 682.3, Building 26, Room G-1,
Greenbelt, Maryland 20771 U.S.A., and IAS, Batiment 121, Universitée Paris XI,
91405 Orsay cedex, France
2Naval Research Laboratory, Code 7675 A, Washington, DC 20375, U.S.A., and George Masson
Universtity, CSI, 4400 University Dr., Fairfax, VA 22030, U.S.A.
(Received 16 September 1999; accepted 2 December 1999)
Abstract. We study a flare which occurred on 3 November 1997 at 10:31 UT in the vicinity of a
parasitic polarity of AR 8100. Using SOHO/EIT 195 Å observations, we identify the brightening of
thin transequatorial loops connecting AR 8100 and AR 8102, and dimmings located between the two
active regions. Difference images highlight the presence of a loop-like structure rooted near the flare
location usually called an EIT wave. The coronal magnetic field derived from potential extrapolations
from a SOHO/MDI magnetogram shows that the topology is complex near the parasitic polarity.
There, a `bald patch' (defined as the locations where the magnetic field is tangent to the photosphere)
is present. We conclude that the flare was a `bald patch flare'. Moreover, the extrapolation confirms
that there is a large coronal volume filled with transequatorial field lines interconnecting AR 8100
and AR 8102, and overlaying the bald patch.
We show that the dimmings are located at the footpoints of these large field lines, which can be

  

Source: Aulanier, Guillaume - Observatoire de Paris

 

Collections: Physics