HR: 1340h
AN: SH23A-0312    [Abstracts]
TI: HXR spectral evolution and SEP production in the January 2005 X-class flares
AU: * Saldanha, R
EM: saldanha@uclink.berkeley.edu
AF: Space Sciences Lab UC Berkeley, 7 Gauss Way, Berkeley, CA 94720-7450 United States
AU: Krucker, S
EM: krucker@ssl.berkeley.edu
AF: Space Sciences Lab UC Berkeley, 7 Gauss Way, Berkeley, CA 94720-7450 United States
AU: Lin, R P
EM: rlin@ssl.berkeley.edu
AF: Space Sciences Lab UC Berkeley, 7 Gauss Way, Berkeley, CA 94720-7450 United States
AB: 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).
DE: 7514 Energetic particles (2114)
DE: 7519 Flares
DE: 7554 X-rays, gamma rays, and neutrinos
SC: SPA-Solar and Heliospheric Physics [SH]
MN: Fall Meeting 2005