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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-2019-90
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-90
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 12 Jul 2019

Submitted as: regular paper | 12 Jul 2019

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

MMS observations of energetic oxygen ions at the low-latitude duskside magnetopause during intense substorms

Chen Zeng1,2, Suping Duan1, Chi Wang1,2, Lei Dai1, Stephen Fuselier3,4, James Burch3, Roy Torbert5, Barbara Giles6, and Christopher Russell7 Chen Zeng et al.
  • 1State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, China
  • 2University of Chinese Academy of Sciences, China
  • 3Southwest Research Institute, San Antonio, Texas, USA
  • 4The University of Texas at San Antonio, San Antonio, Texas, USA
  • 5University of New Hampshire, Space Science Center, Durham, New Hampshire, USA
  • 6NASA, Goddard Space Flight Center, Greenbelt, MD, USA
  • 7University of California Los Angeles, IGPP/EPSS, Los Angeles, California, USA

Abstract. Energetic oxygen ions O+ (> 1 keV) observed by the Magnetospheric Multiscale (MMS) satellites at the dusk flank magnetopause during the phase 1a and 1b are investigated. There are 31 dusk flank magnetopause crossing events during intense substorms (AE > 500 nT) are identified. These 31 events of energetic O+ at the dusk flank magnetopause include 9 events during the expansion phase and 22 events during the recovery phase of intense substorms. It is noted that 9 events of energetic O+ ion at the dusk flank magnetopause during intense substorms expansion phase are all under the southward IMF conditions. The number density of energetic O+ at the dusk flank magnetopause ranges from 0.01 cm−3 to 0.2 cm−3. The maximum number density ratio of O+/H+ is ~ 0.055 during intense substorm recovery phase with AE index about 610 nT and under the northward interplanetary magnetic field (IMF). The number density ratio of O+/H+ also shows an exponential increase with the IMF By. While IMF Bz seems play a minor role in O+ abundance at the dusk flank magnetopause during intense substrom. Our observations suggest that energetic oxygen ions play a key role in the mass and energy transferring from the tail to the dayside in the magnetosphere during intense substorms.

Chen Zeng et al.
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Short summary
Oxygen ions are an important element in the mass and energy transport in the magnetospheric dynamic process during intense substorms (AE > 500 nT). We did this work to better understand the O+ at the dusk flank magnetopause varying with solar wind conditions and AE index during intense substorm. The results show the O+ abundance at the dusk flank magnetopause have a corresponding relation with that in the duskside near Earth plasma sheet and the enhancement of O+ may affect the reconnection at MP.
Oxygen ions are an important element in the mass and energy transport in the magnetospheric...
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