HXR spectral evolution and SEP production in the January 2005 X-class flares

Details HXR spectral evolution and SEP production in the January 2005 X-class flares HXR spectral evolution and SEP production in the January 2005 X-class flares

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh23a0312s&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH23A-0312

Other

7514 Energetic Particles (2114), 7519 Flares, 7554 X-Rays, Gamma Rays, And Neutrinos

Scientific paper

The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) was used to study non-thermal hard X-ray spectra of four solar X-class flares of January 2005 (January 15th, 17th, 19th and 20th). Excluding the January 19th event, the other three flares were found to be associated with Solar Energetic Particles (SEPs). The three SEP related flares show progressive spectral hardening over individual flux peaks (a soft-hard-harder spectral evolution) with spectral power-law indices ranging from 4.0 to 2.0, while the January 19th flare displayed a more typical soft-hard-soft spectral evolution in the main peak (i.e. spectral power law indices are anti-correlated with the HXR flux). These findings are consistent with earlier results of Kiplinger (1995).

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