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Weak solar flares with a detectable flux of hard X rays: Specific features of microwave radiation in the corresponding active regions

Livshits, M. A.; Grigor'eva, I. Yu.

The emission of very weak flares was registered at the Suzaku X-ray observatory in 2005–2009. The photon power spectrum in the 50–110 keV range for a number of these phenomena shows that some electrons accelerate to energies higher than 100 keV. The corresponding flares originate in active regions (ARs) with pronounced sunspots. As in the case of …