Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...691..299s&link_type=abstract
The Astrophysical Journal, Volume 691, Issue 1, pp. 299-305 (2009).
Astronomy and Astrophysics
Astronomy
8
Sun: Flares, Sun: X-Rays, Gamma Rays
Scientific paper
In this paper, 28 peaks and subpeaks are selected in 13 RHESSI hard X-ray (HXR) flares with a single-loop structure. One looptop (LT) source is observed at lower energies, and two footpoint (FP) sources are observed at higher energies in these flares. The HXR flare spectra in the LT and FP sources are studied statistically. It is found that the LT spectral index (γLT) is well correlated with the FP spectral index (γFP) for larger values of γLT, while γLT is anticorrelated with γFP for smaller values of γLT. This new statistical result may be explained by the different relationships between the photon fluxes and spectral indices in the LT and FP sources, as well as by the nonthermal thin-target model with a larger low-cutoff energy.
Huang Guangli
Shao Chengwen
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