Diagnostics of the Low-Cutoff Energy of Nonthermal Electrons in Solar Microwave and Hard X-Ray Bursts |
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| Authors: | Guangli Huang |
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| Institution: | (1) Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, 210008, People’s Republic of China |
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| Abstract: | The low-cutoff energy has a strong effect on the relationship between the radiation and electron spectral indices in both
nonthermal gyrosynchrotron and bremsstrahlung theories. Hence, we have to calculate or fit the low-cutoff energy together
with the electron spectral index as two independent parameters. Theoretical calculations of nonthermal gyrosynchrotron and
bremsstrahlung radiations suggest a new method to obtain the exact solutions of the low-cutoff energy and the electron spectral
index from the observable photon spectral indices at two adjacent energy or frequency bands (double power law). One flare
on 10 June 2000 was studied as an example of the hard X-ray and microwave diagnostics for the low-cutoff energy and the electron
spectral index. The results showed some differences between hard X-ray and microwave diagnostics. |
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| Keywords: | Sun: coronal Sun: radio radiation Sun: X-rays |
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