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An Ephemeral Red Ar...
An Ephemeral Red Arc Appeared at 68 degrees MLat at a Pseudo Breakup During Geomagnetically Quiet Conditions
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- Oyama, S. (author)
- Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan.;Univ Oulu, Space Phys & Astron Res Unit, Oulu, Finland.;Natl Inst Polar Res, Tachikawa, Tokyo, Japan.
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- Shinbori, A. (author)
- Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan.
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- Ogawa, Y. (author)
- Natl Inst Polar Res, Tachikawa, Tokyo, Japan.
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- Kellinsalmi, M. (author)
- Finnish Meteorol Inst, Helsinki, Finland.
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- Raita, T. (author)
- Univ Oulu, Sodankyla Geophys Observ, Oulu, Finland.
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- Aikio, A. (author)
- Univ Oulu, Space Phys & Astron Res Unit, Oulu, Finland.
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- Vanhamaeki, H. (author)
- Univ Oulu, Space Phys & Astron Res Unit, Oulu, Finland.
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- Shiokawa, K. (author)
- Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan.
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- Virtanen, I. (author)
- Univ Oulu, Space Phys & Astron Res Unit, Oulu, Finland.
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- Cai, Lei (author)
- KTH,Rymd- och plasmafysik
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- Workayehu, A. B. (author)
- Univ Oulu, Space Phys & Astron Res Unit, Oulu, Finland.
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- Pedersen, M. (author)
- Univ Oulu, Space Phys & Astron Res Unit, Oulu, Finland.
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- Kauristie, K. (author)
- Finnish Meteorol Inst, Helsinki, Finland.
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- Tsuda, T. T. (author)
- Univ Electrocommun, Dept Comp & Network Engn, Chofu, Tokyo, Japan.
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- Kozelov, B. (author)
- Polar Geophys Inst, Apatity, Russia.
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- Demekhov, A. (author)
- Polar Geophys Inst, Apatity, Russia.
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- Yahnin, A. (author)
- Polar Geophys Inst, Apatity, Russia.
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- Tsuchiya, F. (author)
- Tohoku Univ, Grad Sch Sci, Sendai, Miyagi, Japan.
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- Kumamoto, A. (author)
- Tohoku Univ, Grad Sch Sci, Sendai, Miyagi, Japan.
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- Kasahara, Y. (author)
- Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa, Japan.
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- Matsuoka, A. (author)
- Kyoto Univ, Kyoto, Japan.
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- Shoji, M. (author)
- Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan.
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- Teramoto, M. (author)
- Kyushu Inst Technol, Dept Space Syst Engn, Kitakyushu, Fukuoka, Japan.
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- Lester, M. (author)
- Univ Leicester, Dept Phys & Astron, Leicester, Leics, England.
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Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan;Univ Oulu, Space Phys & Astron Res Unit, Oulu, Finland.;Natl Inst Polar Res, Tachikawa, Tokyo, Japan. Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan. (creator_code:org_t)
- American Geophysical Union (AGU), 2020
- 2020
- English.
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In: Journal of Geophysical Research - Space Physics. - : American Geophysical Union (AGU). - 2169-9380 .- 2169-9402. ; 125:10
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Various subauroral optical features have been studied by analyzing data collected during periods of geomagnetic disturbances. Most events have been typically found at geomagnetic latitudes of 45-60 degrees. In this study, however, we present a red arc event found at geomagnetic 68 degrees north (L approximate to 7.1) in the Scandinavian sector during a period of geomagnetically quiet conditions within a short intermission between two high-speed solar wind events. The red arc appeared to coincide with a pseudo breakup at geomagnetic 71-72 degrees N and a rapid equatorward expansion of the polar cap. However, the red arc disappeared in approximately 7 min. Simultaneous measurements with the Swarm A/C satellites indicated the appearance of the red arc at the ionospheric trough minimum and a conspicuous enhancement of the electron temperature, suggesting the generation of the arc by heat flux. Since there are meaningful differences in the red arc features from already-known subauroral optical features such as the stable auroral red (SAR) arc, we considered that the red arc is a new phenomenon. We suggest that the ephemeral red arc may represent the moment of SAR arc birth associated with substorm particle injection, which is generally masked by bright dynamic aurorae.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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To the university's database
- By the author/editor
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Oyama, S.
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Shinbori, A.
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Ogawa, Y.
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Kellinsalmi, M.
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Raita, T.
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Aikio, A.
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Vanhamaeki, H.
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Shiokawa, K.
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Virtanen, I.
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Cai, Lei
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Workayehu, A. B.
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Pedersen, M.
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Kauristie, K.
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Tsuda, T. T.
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Kozelov, B.
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Demekhov, A.
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Yahnin, A.
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Tsuchiya, F.
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Kumamoto, A.
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Kasahara, Y.
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Matsuoka, A.
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Shoji, M.
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Teramoto, M.
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Lester, M.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
- Articles in the publication
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Journal of Geoph ...
- By the university
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Royal Institute of Technology