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An Ephemeral Red Arc Appeared at 68 degrees MLat at a Pseudo Breakup During Geomagnetically Quiet Conditions
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- Oyama, S. (författare)
- 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. (författare)
- Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan.
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- Ogawa, Y. (författare)
- Natl Inst Polar Res, Tachikawa, Tokyo, Japan.
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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
- Engelska.
- Ingår i: Journal of Geophysical Research - Space Physics. - : American Geophysical Union (AGU). - 2169-9380 .- 2169-9402. ; 125:10
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- 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.
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- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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- Oyama, S.
- Shinbori, A.
- Ogawa, Y.
- Kellinsalmi, M.
- Raita, T.
- Aikio, A.
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- Vanhamaeki, H.
- Shiokawa, K.
- Virtanen, I.
- Cai, Lei
- Workayehu, A. B.
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- Tsuda, T. T.
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- Demekhov, A.
- Yahnin, A.
- Tsuchiya, F.
- Kumamoto, A.
- Kasahara, Y.
- Matsuoka, A.
- Shoji, M.
- Teramoto, M.
- Lester, M.
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