Аннотация:The large (X-ray class > M1) and very large (X-ray class >X1) flares
(according to the observations of GOES-15 and Preliminary data from Current
Catalog of Flare Events) in solar activity cycle 24 were analyzed. The monthly
average values of optical Flare Index for 2010 - 2016 were calculated. The
values of the total energy of the flare E (J m-2) in the 0.1 -- 0.8 nm range at
the level of the earth's atmosphere were estimated. The energy spectrum (the
dependence of the number of flares with the full energy E from the value of
this full energy) for 115 flares of M5 - X7 classes was built. The comparative
study of monthly averaged values of several indices of solar activity in
current cycle 24: the relative sunspot numbers (SSN), the 10.7 cm radio flux,
the radiation flux in the Lyman-alpha line, the solar constant (TSI) and the
Flare Index (FI) was made.