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Magnetic Field, Hα and RHESSI Observations of the July 23, 2002 Gamma-ray Flare View all abstracts by submitter

Vasyl Yurchyshyn   Submitted: 2004-01-07 13:17

In this paper we examine two aspects July 23 2002 gamma-ray flare by using multi-wavelength observations of this well-observed flare. First, the data suggests that the interaction of the erupted field with an overlaying large-scale coronal field can explain the offset between the gamma-ray and the hard X-ray sources observed in this event. Second, we pay attention to rapid and permanent changes of the photospheric magnetic field associated with the flare. MDI and BBSO magnetograms showed that the following magnetic flux had rapidly decreased by 1 imes1020Mx immediately after the flare, while the leading polarity was gradually increasing for several hours after the flare. Our study also suggests that the changes were most probably associated with the emergence of new flux and the re-orientation of the magnetic field lines. We interpret the magnetograph and spectral data for this event in terms of the tether-cutting model.

Authors: Vasyl Yurchyshyn, Haimin Wang, Valentyna Abramenko, Thomas J. Spirock and Säm Krucker
Projects: None

Publication Status: ApJ (accepted)
Last Modified: 2004-01-07 13:17
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