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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-5
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-5
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 21 Jan 2019

Regular paper | 21 Jan 2019

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Annales Geophysicae (ANGEO).

Energetic electron enhancements under radiation belt (L < 1.2) during nonstorm interval on August 1, 2008

Alla V. Suvorova1,3, Alexei V. Dmitriev2,3, and Vladimir A. Parkhomov4 Alla V. Suvorova et al.
  • 1GPS Science and Application Research Center, National Central University, Jhongli, Taiwan
  • 2Institute of Space Science, National Central University, Jhongli, Taiwan
  • 3Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia
  • 4Baikal State University, Irkutsk, Russia

Abstract. An unusual event of deep injections of > 30 keV electrons from the radiation belt to low L shells (L < 1.2) in midnight-dawn sector occurred during nonstorm conditions on August 1, 2008. 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 were observed by the THEMIS probes after approaching the magnetopause. The magnetosphere responded to variations in the IMF orientation by magnetic field perturbations. Magnetic records at ground-magnetometers of INTERMAGNET provided evidence of a global geomagnetic response in the form of geomagnetic pulses from the equator to middle latitudes. The earliest 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.

Alla V. Suvorova et al.
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Alla V. Suvorova et al.
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Latest update: 21 Jul 2019
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Short summary
The Earth's radiation belts control the space environment often affecting the GPS signal propagation and satellite operations. Intense fluxes of energetic particles can penetrate even below the inner belt near the equator. We analyzed electron penetrations under geomagnetic quiet conditions and found in the solar wind an external driver caused that. Satellite observations prove that disturbance of the inner belt was associated with impact of plasma jets formed in the solar wind nearby the Earth.
The Earth's radiation belts control the space environment often affecting the GPS signal...
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