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Energetic electron enhancements under the radiation belt (L < 1.2) during a non-storm interval on 1 August 2008

Abstract. An unusual event of deep injections of >30  keV electrons from
the radiation belt to low L shells ( L ) in the midnight–dawn sector
was found from NOAA/POES observations during quiet geomagnetic conditions on
1 August 2008. Using THEMIS observations in front of the bow shock, we
found transient foreshock conditions and interplanetary magnetic
field (IMF) discontinuities passing the
subsolar region at that time. These conditions resulted in generation of
plasma pressure pulses and fast plasma jets observed by THEMIS,
respectively, in the foreshock and magnetosheath. Signatures of interactions
of pressure pulses and jets with the magnetopause were found in THEMIS and
GOES measurements in the dayside magnetosphere and ground magnetogram
records from INTERMAGNET. The jets produce penetration of hot magnetosheath
plasma into the dayside magnetosphere, as was observed by the THEMIS probes
after approaching the magnetopause. High-latitude precipitations of the hot
plasma were observed by NOAA/POES satellites on the dayside. The
precipitations preceded the >30  keV electron injections at low
latitudes. We propose a scenario of possible association between the
phenomena observed. However, the scenario cannot be firmly supported because
of the lack of experimental data on electric fields at the heights of
electron injections. This should be a subject of future experiments.