Variations of Photospheric Magnetic Field Associated with Flares and CMEs

Details Variations of Photospheric Magnetic Field Associated with Flares and CMEs Variations of Photospheric Magnetic Field Associated with Flares and CMEs

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..190..459k&link_type=abstract

Solar Physics, v. 190, Issue 1/2, p. 459-466 (1999).

Physics

30

Scientific paper

Using high-cadence magnetograms from the SOHO/MDI we have investigated variations of the photospheric magnetic field during solar flares and CMEs. In the case of a strong X-class flare of May 2, 1998, we have detected variations of magnetic field in a form of a rapidly propagating magnetic wave. During the impulsive phase of the flare we have observed a sudden decrease of the magnetic energy in the flare region. This provides direct evidence of magnetic energy release in solar flares. We discuss the physics of the magnetic field variations, and their relations to the Moreton Hα waves and the coronal waves observed by the EIT.

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