%0 Journal Article %T Classification of solar X-ray flares on X-ray measurements on board geostationary satellites ``Elektro'' %A Nusinov, A.A. %A Katyushina, V.V. %K Sun, ionosphere, X-rays, flares, modeling %J Russian Journal of Earth Sciences %D 2012 %N 12 %P 5 %I Geophysical Center of the Russian Academy of Sciences