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On the source of th...
On the source of the polar wind in the polar topside ionosphere : First results from the EISCAT Svalbard radar
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Ogawa, Y. (författare)
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Häggström, I. (författare)
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- Buchert, Stephan C. (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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Oksavik, K. (författare)
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Nozawa, S. (författare)
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Hirahara, M. (författare)
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van Eyken, A. P. (författare)
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Aso, T. (författare)
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Fujii, R. (författare)
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(creator_code:org_t)
- 2009
- 2009
- Engelska.
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Ingår i: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 36:24, s. L24103-
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We present quantitative radar observations of both hydrogen ion (H+) and oxygen ion (O+) upflow in the topside polar ionosphere using measurements that were recently carried out with the EISCAT Svalbard Radar and the Reimei satellite. H+ upflow was clearly observed equatorward of the cusp above 500 km altitude. Within the cusp the H+ density was very low, and the upflow was dominated by O+ ions, but on closed field lines the H+ became the larger contributor to the upward flux above about 550 km. The total flux seemed to be conserved, and so below 550 km altitude O+ (with a small upward velocity of similar to 50 m s(-1)) appeared to determine the upward flux which was then maintained by H+! in the topside ionosphere. We also found that the H+ density in the topside polar ionosphere was several times higher than current predictions of ionospheric models like IRI2001.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Physics
- Fysik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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