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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-2019-49
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-49
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 24 Apr 2019

Regular paper | 24 Apr 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

Magnetic local time asymmetries in electron and proton precipitation with and without substorm activity

Olesya Yakovchuk1,2 and Jan Maik Wissing1 Olesya Yakovchuk and Jan Maik Wissing
  • 1The Institute of Environmental Systems Research, University of Osnabrück, Osnabrück, 49069, Germany
  • 2Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow 119234, Russia

Abstract. The magnetic local time (MLT) dependence of electron (0.15–300 keV) and proton (0.15–6900 keV) precipitation into the atmosphere based on National Oceanic and Atmospheric Administration POES and METOP satellites data during 2001–2008 was described. Using modified APEX coordinates the influence of particle energy, substorm activity and geomagnetic disturbance on the MLT flux distribution was statistically analysed.

Some of the findings are: a) MLT flux differences of up to 1 : 25 have been localized inside the auroral oval. b) MLT dependence can be assigned to different particle sources and energy-specific drifts. c) The maximum flux asymmetry ratio depends on particle energy, but not necessarily on geomagnetic disturbance. For protons it is invariant with Kp, for electrons the dependence varies with Kp and kinetic energy defines how. d) Substorms mostly increase particle precipitation in the night-sector by about factor 2–4 but can also reduce it in the day-sector.

Finally we have a look at MLT-dependent trapped particle flux in the plasmasphere, which shows vast and abstract MLT differences.

Olesya Yakovchuk and Jan Maik Wissing
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Olesya Yakovchuk and Jan Maik Wissing
Olesya Yakovchuk and Jan Maik Wissing
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Short summary
We present the MLT-distribution of energetic particle precipitation into the ionosphere in combination with different substorm activities as well as MLT-dependent trapped plasmaspheric particle flux. MLT dependence can be assigned to different particle sources and energy-specific drifts. The maximum flux asymmetry ratio depends on particle energy, but not necessarily on geomagnetic disturbance. Substorms increase particle precipitation during night (factor 2–4) but may reduce it during day.
We present the MLT-distribution of energetic particle precipitation into the ionosphere in...
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