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Localized field-ali...
Localized field-aligned currents in the polar cap associated with airglow patches
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- Zou, Ying (författare)
- Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA.
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- Nishimura, Yukitoshi (författare)
- Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA.;Boston Univ, Dept Elect & Comp Engn, Boston, MA USA.;Boston Univ, Ctr Space Phys, Boston, MA USA.
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- Burchill, Johnathan K. (författare)
- Univ Calgary, Dept Phys & Astron, Calgary, AB, Canada.
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- Knudsen, David J. (författare)
- Univ Calgary, Dept Phys & Astron, Calgary, AB, Canada.
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- Lyons, Larry R. (författare)
- Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA.
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- Shiokawa, Kazuo (författare)
- Nagoya Univ, Inst Space Earth Environm Res, Ctr Int Collaborat Res, Nagoya, Aichi, Japan.
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- Buchert, Stephan (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Chen, Steve (författare)
- SRI Int, Menlo Pk, CA 94025 USA.
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- Nicolls, Michael J. (författare)
- SRI Int, Menlo Pk, CA 94025 USA.
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- Ruohoniemi, J. Michael (författare)
- Virginia Tech, Bradley Dept Elect & Comp Engn, Blacksburg, VA USA.
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- McWilliams, Kathryn A. (författare)
- Univ Saskatchewan, Inst Space & Atmospher Studies, Saskatoon, SK, Canada.
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- Nishitani, Nozomu (författare)
- Nagoya Univ, Solar Terr Environm Lab, Nagoya, Aichi, Japan.
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Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA.;Boston Univ, Dept Elect & Comp Engn, Boston, MA USA.;Boston Univ, Ctr Space Phys, Boston, MA USA. (creator_code:org_t)
- 2016
- 2016
- Engelska.
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Ingår i: Journal of Geophysical Research - Space Physics. - 2169-9380 .- 2169-9402. ; 121:10, s. 10172-10189
- 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
- Airglow patches have been recently associated with channels of enhanced antisunward ionospheric flows propagating across the polar cap from the dayside to nightside auroral ovals. However, how these flows maintain their localized nature without diffusing away remains unsolved. We examine whether patches and collocated flows are associated with localized field-aligned currents (FACs) in the polar cap by using coordinated observations of the Swarm spacecraft, a polar cap all-sky imager, and Super Dual Auroral Radar Network (SuperDARN) radars. We commonly (66% of cases) identify substantial FAC enhancements around patches, particularly near the patches' leading edge and center, in contrast to what is seen in the otherwise quiet polar cap. These FACs have densities of 0.1-0.2 mu A/m(-2) and have a distribution of width peaking at similar to 75 km. They can be approximated as infinite current sheets that are orientated roughly parallel to patches. They usually exhibit a Region 1 sense, i.e., a downward FAC lying eastward of an upward FAC. With the addition of Resolute Bay Incoherent Scatter radar data, we find that the FACs can close through Pedersen currents in the ionosphere, consistent with the locally enhanced dawn-dusk electric field across the patch. Our results suggest that ionospheric polar cap flow channels are imposed by structures in the magnetospheric lobe via FACs, and thus manifest mesoscale magnetosphere-ionosphere coupling embedded in large-scale convection.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
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Zou, Ying
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Nishimura, Yukit ...
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Burchill, Johnat ...
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Knudsen, David J ...
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Lyons, Larry R.
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Shiokawa, Kazuo
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visa fler...
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Buchert, Stephan
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Chen, Steve
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Nicolls, Michael ...
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Ruohoniemi, J. M ...
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McWilliams, Kath ...
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Nishitani, Nozom ...
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visa färre...
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