MEASUREMENT OF ENERGY DISTRIBUTION FOR LOW POWER NANOFLARES

We propose a method to measure the en-ergy distribution of low-energy flares (nanoflares) in the energy range below 10(23) erg. As an example, we meas-ured the spectrum of nanoflares in the 10(21)-10(26) erg range for two Sun's frames observed by the SDO/AIA telescope in the 171 angstrom channel. Nanoflares are shown to have the power law spectrum in the 10(22)-10(26) erg range. The spectral index is approximately constant, i.e. ener-gy-independent. For energies below 10(22) erg, the spec-trum begins to collapse. For lower energies, below 10(21) erg, the method does not give statistically significant results due to major errors. The results of the study indicate that solar nanoflares can be detected up to 10(21)- 10(22) erg energies. Results have previously been reported only for 1023 erg and above. The total energy flux of nanoflares in the energy range above 10(22) erg, according to our data, is P approximate to 10(4) erg cm(-2) s(-1), which is about 15 times less than heating losses of the solar corona.