ИСТИНА

We discuss new observations of superflares on G stars discovered in optics with the Kepler mission. The origin of superflares is associated with effective particles acceleration on these stars that are slightly younger than the contemporary Sun. With a limited electron flux, penetrating into the chromosphere the explosive evaporation should lead to generation of the optical continuum covering the area of about 10^19 cm^2. Such an area is typical to Hα-ribbons of powerful solar flares and it is by 2 orders of magnitudes greater than that of white-light flares on the Sun. We propose that model of the optical continuum source consisting of the blue and red continua. We discuss two consequences of this model in the case of the hard spectrum of accelerated particles. Firstly, even in flares with E=10^34 erg, that can occur on the young Sun, a microwave source should arise, and its flux at 35 GHz is about of 7 mJn at the distance of 100 pc can be registered, for instance, with VLA (Very Large Array). Secondly, one can attempt to detect of flare-produced lithium that arises in the course of spallation reactions. The positive results of these observations will be evidence for extreme effective acceleration of particles in stellar atmospheres.