Mathematics – Probability
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...1e..48k&link_type=abstract
Cosmic Particle Acceleration, 26th meeting of the IAU, Joint Discussion 1, 16-17 August, 2006, Prague, Czech Republic, JD01, #48
Mathematics
Probability
Scientific paper
Hard X-ray spectra of solar flares are generated as bremsstrahlung of accelerated electrons propagating in solar corona. The photons emitted towards the photosphere have a high probability to undergo Compton backscattering into observers direction. They form so called photospheric albedo component and modify the spatially integrated photon spectra of solar flares. Analysing 409 solar flares observed by RHESSI, we show significant centre-to-limb variation of observed photon spectra in energies ~ 20 keV, which is consistent with the photospheric albedo. Moreover, we also show that the low-energy cutoff in the mean electron spectrum can be viewed as an artifact of the albedo component. Noting that the amount of backscattered photons strongly depends on the downward directed photon flux, we determine for the first time the directivity of the downward photon flux. The results favour near-isotropic photon distribution and represent a problem for the models with downward propagating electron beam.
Kasparova Jana
Kontar Eduard P.
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