Coronal γ-Ray Bremsstrahlung from Solar Flare-accelerated Electrons

Details Coronal γ-Ray Bremsstrahlung from Solar Flare-accelerated Electrons Coronal γ-Ray Bremsstrahlung from Solar Flare-accelerated Electrons

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...678l..63k&link_type=abstract

The Astrophysical Journal, Volume 678, Issue 1, pp. L63-L66.

Astronomy and Astrophysics

Astronomy

26

Sun: Flares, Sun: Particle Emission, Sun: X-Rays, Gamma Rays

Scientific paper

The Reuven Ramaty High Energy Spectroscopic Imager (RHESSI) provides for the first time imaging spectroscopy of solar flares up to the γ-ray range. The three RHESSI flares with best counting statistics are analyzed in the 200-800 keV range revealing γ-ray emission produced by electron bremsstrahlung from footpoints of flare loops, but also from the corona. Footpoint emission dominates during the γ-ray peak, but as the γ-ray emission decreases the coronal source becomes more and more prominent. Furthermore, the coronal source shows a much harder spectrum (with power-law indices γ between 1.5 and 2) than the footpoints (with γ between 3 and 4). These observations suggest that flare-accelerated high-energy (~MeV) electrons stay long enough in the corona to lose their energy by collisions producing γ-ray emission, while lower energetic electrons precipitate more rapidly to the footpoints.

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