ИСТИНА

In the region beneath the inner radiation belt (RB) at drift shells L<1.2, in a so-called forbidden zone, particle flux intensity has long been considered as stably tenuous because of RB losses in atmospheric collisions in the vicinity of the South Atlantic anomaly (SAA). Figure 1a shows a global map with weak fluxes of >30 keV electrons in the forbidden zone obtained from measurements on board the NOAA/POES satellites at orbital height of ~850 km. In 2012, the concept of stable forbidden zone had changed when strong enhancements of >30 keV electron fluxes were found in the region [1] (see Fig.1, b-d). The flux enhancements are peculiar to locally trapped electrons in the low/medium energy range from 10 to 300 keV and vary between 10^4 and 10^7 el/(cm2 s sr) [2]. These electrons can form transient (unstable) population [3]. Later, the study [4] found flux enhancements of 100s keV electrons in the inner RB at L~1.2. The authors [5] experimentally proved that the enhanced “forbidden” energetic electrons (FEE) originate from the inner RB.