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Observations of oxygen ions in the dayside magnetosheath associated with southward IMF
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.ORCID iD: 0000-0002-2347-1871
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-5294-1855
Swedish Institute of Space Physics / Institutet för rymdfysik.
2012 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 117Article 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 Bz<0. Three satellites observe O$^+ immediately at both sides of the magnetopause and about 2 RE 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 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
National Category
Fluid Mechanics and Acoustics Aerospace Engineering
Research subject
Fluid Mechanics; Space Technology
Identifiers
URN: urn:nbn:se:ltu:diva-9524DOI: 10.1029/2012JA017754Local ID: 82d94957-301c-4425-b64b-b36361da0d80OAI: oai:DiVA.org:ltu-9524DiVA: diva2:982462
Note
Validerad; 2012; Bibliografisk uppgift: Article no A07218; 20120614 (lgwe)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-10-19Bibliographically approved

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Slapak, RikardNilsson, HansWesterberg, Lars-Göran
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