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  Estimating the fate of oxygen ion outflow from the high-altitude cusp

Krcelic, P., Haaland, S., Maes, L., Slapak, R., & Schillings, A. (2020). Estimating the fate of oxygen ion outflow from the high-altitude cusp. Annales Geophysicae, 38(2), 491-505. doi:10.5194/angeo-38-491-2020.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-F524-D Version Permalink: http://hdl.handle.net/21.11116/0000-0007-4D32-B
Genre: Journal Article

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 Creators:
Krcelic, Patrik1, Author
Haaland, Stein2, Author              
Maes, Lukas2, Author              
Slapak, Rikard, Author
Schillings, Audrey, Author
Affiliations:
1Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1125546              
2Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 MPIS_PROJECTS: Cluster
 Abstract: We have investigated the oxygen escape-to-capture ratio from the high-altitude cusp regions for various geomagnetic activity levels by combining EDI and CODIF measurements from the Cluster spacecraft. Using a magnetic field model, we traced the observed oxygen ions to one of three regions: plasma sheet, solar wind beyond a distant X-line or dayside magnetosheath. Our results indicate that 69 % of high-altitude oxygen escapes the magnetosphere, from which most escapes beyond the distant X-line (50 % of total oxygen flux). Convection of oxygen to the plasma sheet shows a strong dependence on geomagnetic activity. We used the Dst index as a proxy for geomagnetic storms and separated data into quiet conditions (Dst>0 nT), moderate conditions (0>Dst>−20 nT), and active conditions (Dst<−20 nT). For quiet magnetospheric conditions we found increased escape due to low convection. For active magnetospheric conditions we found an increase in both parallel velocities and convection velocities, but the increase in convection velocities is higher, and thus most of the oxygen gets convected into the plasma sheet (73 %). The convected oxygen ions reach the plasma sheet in the distant tail, mostly beyond 50 RE.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.5194/angeo-38-491-2020
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Title: Annales Geophysicae
Source Genre: Journal
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Publ. Info: Montrouge Cedex, France : Gauthier-Villars
Pages: - Volume / Issue: 38 (2) Sequence Number: - Start / End Page: 491 - 505 Identifier: ISSN: 0992-7689
CoNE: https://pure.mpg.de/cone/journals/resource/954928606127