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Observations of oxygen ions in the dayside magnetosheath associated with southward IMF
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
2012 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 117, A07218- p.Article in journal (Refereed) Published
Abstract [en]

We present a case study of high energy oxygen ions (O+) observed in the dayside terrestrial magnetosheath, in the southern hemisphere. It is shown that the presence of O+ is strongly correlated to the IMF direction: O+ is observed only for B-z < 0. Three satellites observe O+ immediately at both sides of the magnetopause and about 2 R-E outside the magnetopause. These conditions indicate escape along open magnetic field lines. We show that if outflowing O+ is heated and accelerated sufficiently in the cusp, it takes 15-20 minutes for it to reach the magnetopause, allowing the ions to escape along newly opened field lines on the dayside. Earlier studies show evidence of strong heating and high velocities of O+ in the cusp and mantle at high altitudes, strengthening our interpretation. The observed magnetosheath O+ fluxes are of the same order as measured in the ionospheric upflow, which indicates that this loss mechanism is significant when it takes place.

Place, publisher, year, edition, pages
2012. Vol. 117, A07218- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-179920DOI: 10.1029/2012JA017754ISI: 000306911000003OAI: oai:DiVA.org:uu-179920DiVA: diva2:547191
Available from: 2012-08-27 Created: 2012-08-27 Last updated: 2012-08-27Bibliographically approved

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Eriksson, Anders
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Swedish Institute of Space Physics, Uppsala Division
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