On the Lower Energy Cutoff of Nonthermal Electrons in Solar Flares

Details On the Lower Energy Cutoff of Nonthermal Electrons in Solar Flares On the Lower Energy Cutoff of Nonthermal Electrons in Solar Flares

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001chjaa...1..453g&link_type=abstract

Chinese Journal of Astronomy & Astrophysics

Astronomy and Astrophysics

Astrophysics

5

Sun: Hard X-Rays, Sun: Gamma-Rays, Sun: Flares, Sun: Particles

Scientific paper

A quantitative method to determine the lower energy cutoff (Ec) of power-law electron beams is established. We apply this method to the 54 hard X-ray events observed with BATSE/Compton Gamma Ray Observatory (CGRO). The results show that about 75% of the observed broken double power-law spectra of hard X-rays can be explained by a lower energy cutoff in the power-law electron beams. The values of Ec, varying among the flares, are all greater than the usually accepted 20 keV! On average, Ec is about 69 keV. So high a lower energy cutoff of nonthermal electrons implies that nonthermal electrons might not be as important in powering solar flares as was previously thought. Further significance of this finding is discussed.

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