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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 31, issue 6
Ann. Geophys., 31, 1005–1010, 2013
https://doi.org/10.5194/angeo-31-1005-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 31, 1005–1010, 2013
https://doi.org/10.5194/angeo-31-1005-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 11 Jun 2013

Regular paper | 11 Jun 2013

A statistical study on O+ flux in the dayside magnetosheath

R. Slapak1,2, H. Nilsson1, and L. G. Westerberg3 R. Slapak et al.
  • 1Swedish Institute of Space Physics, Kiruna, Sweden
  • 2Department of Computer Science, Electrical and Space Engineering, Luleå University of Technology, Luleå, Sweden
  • 3Division of Fluid and Experimental Mechanics, Luleå University of Technology, Luleå, Sweden

Abstract. Studies on terrestrial oxygen ion (O+) escape into the interplanetary space have considered a number of different escape paths. Recent observations however suggest a yet insufficiently investigated additional escape route for hot O+: along open magnetic field lines in the high altitude cusp and mantle. Here we present a statistical study on O+ flux in the high-latitude dayside magnetosheath. The O+ is generally seen relatively close to the magnetopause, consistent with observations of O+ flowing primarily tangentially to the magnetopause. We estimate the total escape flux in this region to be ~ 7 × 1024 s−1, implying this escape route to significantly contribute to the overall total O+ loss into interplanetary space.

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