ИСТИНА

We studied an unusual "quiet" event of deep injections of >30 keV electrons at drift shells L<1.2 during non-storm conditions on August 1, 2008. Long-time strong enhancements of forbidden energetic electrons (FEE) were observed by NOAA/POES satellites. We determined that the multiple injections occurred in the predawn sector before a weak auroral activity. Upstream solar wind conditions were examined on parameters driving the electron injections, but this did not yield the desired results. Using THEMIS observations in front of the bow shock, we found transient foreshock conditions and rotational discontinuities passing the subsolar region at that time. These conditions resulted in generation of fast magnetosheath plasma jets and penetration of the magnetosheath plasma into the magnetosphere as observed by THEMIS. The magnetosphere responded to variations in the interplanetary magnetic field (IMF) orientation by magnetic field perturbations. Magnetic records at ground-magnetometers of INTERMAGNET provided evidence of a global geomagnetic response from the equator to middle latitudes. The earlier response was found at low latitudes in the predawn sector. We propose a scenario of possible association between dynamical foreshock in the subsolar region, magnetosheath plasma jets and the deepest injections of the >30 keV electrons at L < 1.2 at the midnight-dawn sector.