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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/angeo-2018-47
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2018-47
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 May 2018

30 May 2018

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This preprint was under review for the journal ANGEO but the revision was not accepted.

Contribution of patchy reconnection to the ion to electron temperature ratio in the Earth's magnetotail

Chuxin Chen1 and Chih-Ping Wang2 Chuxin Chen and Chih-Ping Wang
  • 1CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China
  • 2epartment of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, USA

Abstract. The ion to electron temperature ratio is a good indicator of the processes involved in the plasma sheet. Observations have suggested that patchy reconnection and the resulting earthward bursty bulk flows (BBFs) transport may be involved in causing the lower temperature ratios at smaller radial distances during southward IMF periods. In this paper, we theoretically estimate how patchy magnetic reconnection electric field accelerates ions and electrons differently. If both ions and electrons are non-adiabatically accelerated merely once in a single reconnection, the temperature ratio would be preserved. However, the ratio would not be preserved if particles are accelerated multiple times. As particles are transported earthward by BBFs after reconnection, the reflection of electrons from the ionosphere and subsequently multiple non-adiabatic accelerations at the reconnection site can explain the observed lower temperature ratios closer to the Earth.

Chuxin Chen and Chih-Ping Wang

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Chuxin Chen and Chih-Ping Wang

Chuxin Chen and Chih-Ping Wang

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Short summary
The ion to electron temperature ratio is a good indicator of the processes involved in the plasma sheet. We theoretically estimate how patchy magnetic reconnection electric field accelerates ions and electrons differently. As particles are transported earthward by BBFs after reconnection, the reflection of electrons from the ionosphere and subsequently multiple non-adiabatic accelerations at the reconnection site can explain the observed lower temperature ratios closer to the Earth.
The ion to electron temperature ratio is a good indicator of the processes involved in the...
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