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Estimating the fate...
Estimating the fate of oxygen ion outflow from the high-altitude cusp
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- Krcelic, Patrik (författare)
- Max-Planck Institute for Solar Systems Research, Göttingen, Germany. Department of Geophysics, Faculty of science, University of Zagreb, Zagreb, Croatia
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- Haaland, Stein (författare)
- Max-Planck Institute for Solar Systems Research, Göttingen, Germany. Birkeland Centre for Space Science, Department of Physics and Technology, University of Bergen, Bergen, Norway
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- Maes, Lukas (författare)
- Max-Planck Institute for Solar Systems Research, Göttingen, Germany
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- Slapak, Rikard (författare)
- EISCAT Scientific Association, Kiruna, Sweden
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- Schillings, Audrey (författare)
- Luleå tekniska universitet,Rymdteknik,Swedish Institute for Space Physics, Kiruna, Sweden
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Max-Planck Institute for Solar Systems Research, Göttingen, Germany Department of Geophysics, Faculty of science, University of Zagreb, Zagreb, Croatia Max-Planck Institute for Solar Systems Research, Göttingen, Germany. Birkeland Centre for Space Science, Department of Physics and Technology, University of Bergen, Bergen, Norway (creator_code:org_t)
- 2020-04-08
- 2020
- Engelska.
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Ingår i: Annales Geophysicae. - : Copernicus Publications. - 0992-7689 .- 1432-0576. ; 38:2, s. 491-505
- Relaterad länk:
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https://angeo.copern...
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https://urn.kb.se/re...
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https://doi.org/10.5...
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Abstract
Ämnesord
Stäng
- 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" role="presentation" style="box-sizing: border-box; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">0>Dst>−20 nT), and active conditions (Dst<-20" role="presentation" style="box-sizing: border-box; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">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.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Rymd- och flygteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Aerospace Engineering (hsv//eng)
Nyckelord
- Atmosfärsvetenskap
- Atmospheric science
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