Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh13a0271y&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SH13A-0271
Physics
7519 Flares, 7524 Magnetic Fields, 7554 X-Rays, Gamma Rays, And Neutrinos
Scientific paper
Several two-ribbon X-class flares which occurred near the solar disk center are investigated in this study. Some specific sub-regions within an active region are selected to estimate the change in magnetic flux from pre-flare to post-flare states. The high-cadence (1-min averaged) MDI magnetogram provides comprehensive photospheric magnetic measurement during these flares. The extreme ultraviolet observations in the wavelengths of 171, 195, and 1600 nm obtained by TRACE are used to search for the correlation of magnetic changes in the corona and transition region. We also used the RHESSI data to identify the hard X-ray source regions and compare them with the magnetic observations. We found that the magnetic fluxes within or in the vicinity of ribbons can change permanently after a flare eruption. Transient magnetic changes are also found in sub-regions. The characteristics of these X-class flares will be discussed in detail in this presentation.
Ip Wing
Krucker Sa"m
Lin Runliang
Yang Yadong
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