Studies of Microflares with RHESSI, Hard X-ray in BBSO Hα and MDI Magnetograms

Details Studies of Microflares with RHESSI, Hard X-ray in BBSO Hα and MDI Magnetograms Studies of Microflares with RHESSI, Hard X-ray in BBSO Hα and MDI Magnetograms

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spd....34.2203l&link_type=abstract

American Astronomical Society, SPD meeting #34, #22.03; Bulletin of the American Astronomical Society, Vol. 35, p.850

Astronomy and Astrophysics

Astronomy

Scientific paper

Microflares are among the most interesting subjects because its accumulated energy may be a substantial part to heat the upper solar atmosphere. The unique high sensitivity in the energy range from ˜3 to 15 keV and excellent spectral and spatial resolution provided by the Ramaty High Energy Solar Spectroscopic Imager mission (RHESSI) allow for the first time the detailed study of the locations and the spectra property of solar microflares. We studied a number of microflares in the energy range from 3 to 15 keV which occurred in several active regions, in July 2002, and we found: (1) from the co-alignment results between RHESSI and MDI, we confirm that almost all the microflares are located in magnetic neutral lines; (2) from the co-alignment results between RHESSI and Hα images, we find that the hard X-ray source tends to connect two Hα footpoints and the RHESSI peaks always occur ˜1 minute earlier than the observable Hα brightening, which indicates the possible loop-top source before the Hα footpoint brightening; (3) We also notice that some microflares are associated with type III radio bursts as observed by the radio spectrometer on-board WIND.

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