Прибор СТЭП-Ф регистрирует залимбовые вспышки на Солнце

The satellite telescope of electrons and protons STEP-F that has been developed by Ukrainian scientists and specialists from Kharkiv National University named V.N. Karazin, and launched into near-Earth space as a part of the scientific equipment "Photon" on the board of Russian scientific spacecraft “Coronas-Photon” on January, 30, 2009, continue to accumulate unique scientific information. Thus, in one of the short periods of increasing solar activity the instrument STEP-F failed to register the arrival of solar cosmic rays in the near-Earth space before the appearance of active regions on the limb of the Sun, usually observed in electromagnetic wavelengths.
During the flare activity of the second half of September, the first active area according to the satellite STEREO spacecraft data had appeared on the visible side of the Sun after 09/17. At the same time, within only 15th September at the eastern border of the limb in the southern hemisphere, where 2 days later came the active region, according to SOHO and STEREO satellites data the fast-changing manifestations of solar activity cops barely noticeable.

At the same day the device STEP-F flying during the temporal interval since ~ 05h05m to 05h10m UTC in the high latitudes of the southern hemisphere in the areas of open magnetic field lines of the Earth, has registered an unusually strong and transient increase of high energy electron fluxes.

This increase of the intensity was not repeated in subsequent days, until September, 20, at the time the satellite passages through the same point of the space. This fact indicates on the high level of the flare’ (or series of flares) magnitude on the invisible side of the Sun.

The natural response of the Earth's magnetosphere has been capture of the electrons came from the Sun in its magnetic field and filling the outer radiation belt by additional flux of electrons, which in turn created additional radiation load on the electronic equipment of spacecrafts, flying under the Earth's radiation belts.
Thus, the device STEP-F can provide monitoring changing particle fluxes of the radiation belts as well as detect cosmic rays from the solar flares and the manifestation of those activities that have or are no longer visible on the limb of the Sun.