Post-midnight purple arc and patches appeared on the high latitude part of the auroral oval: Dawnside counterpart of STEVE?
Abstract The phenomenon known as strong thermal emission velocity enhancement (STEVE) is a purple/mauve arc-shaped atmospheric glow observed at lower latitudes of the auroral oval on the duskside. Simultaneous observations using a ground-based camera and a low-altitude satellite have shown that STEV...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-04-01
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| Series: | Earth, Planets and Space |
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| Online Access: | https://doi.org/10.1186/s40623-024-01995-9 |
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| author | Sota Nanjo Gabriel Arne Hofstra Kazuo Shiokawa Atsuki Shinbori Satonori Nozawa Keisuke Hosokawa |
| author_facet | Sota Nanjo Gabriel Arne Hofstra Kazuo Shiokawa Atsuki Shinbori Satonori Nozawa Keisuke Hosokawa |
| author_sort | Sota Nanjo |
| collection | DOAJ |
| description | Abstract The phenomenon known as strong thermal emission velocity enhancement (STEVE) is a purple/mauve arc-shaped atmospheric glow observed at lower latitudes of the auroral oval on the duskside. Simultaneous observations using a ground-based camera and a low-altitude satellite have shown that STEVE is accompanied by rapid westward ion flows. Such fast ion flows are termed the subauroral ion drift (SAID) or subauroral polarization stream (SAPS). Similarly, an eastward fast ion flow known as the dawnside auroral polarization stream (DAPS) is observed within the Region 1 current on the dawnside. If the optical phenomenon triggered by SAID/SAPS corresponds to STEVE, a comparable optical phenomenon should be driven by DAPS. Thus far, however, such a phenomenon has not been reported. This study discovers, for the first time, a purple-colored optical phenomenon characterized by the fast eastward ion flows, a possible signature of DAPS, occurring poleward of the bright green arc in the post-midnight sector. We present color all-sky images obtained by a ground-based commercial digital camera, along with wide-coverage optical measurements and in-situ data from low-altitude satellites. The results imply that this glow requires not only a high-speed ion flow but also its sharp latitudinal gradient at the boundary between the Region 1 and 2. Graphical Abstract |
| first_indexed | 2024-04-24T09:55:20Z |
| format | Article |
| id | doaj.art-666cea50343b4f7c820a5b78f65c5fca |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2024-04-24T09:55:20Z |
| publishDate | 2024-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Earth, Planets and Space |
| spelling | doaj.art-666cea50343b4f7c820a5b78f65c5fca2024-04-14T11:09:53ZengSpringerOpenEarth, Planets and Space1880-59812024-04-0176111410.1186/s40623-024-01995-9Post-midnight purple arc and patches appeared on the high latitude part of the auroral oval: Dawnside counterpart of STEVE?Sota Nanjo0Gabriel Arne Hofstra1Kazuo Shiokawa2Atsuki Shinbori3Satonori Nozawa4Keisuke Hosokawa5The University of Electro-CommunicationsPhotographerInstitute for Space-Earth Environmental Research, Nagoya UniversityInstitute for Space-Earth Environmental Research, Nagoya UniversityInstitute for Space-Earth Environmental Research, Nagoya UniversityThe University of Electro-CommunicationsAbstract The phenomenon known as strong thermal emission velocity enhancement (STEVE) is a purple/mauve arc-shaped atmospheric glow observed at lower latitudes of the auroral oval on the duskside. Simultaneous observations using a ground-based camera and a low-altitude satellite have shown that STEVE is accompanied by rapid westward ion flows. Such fast ion flows are termed the subauroral ion drift (SAID) or subauroral polarization stream (SAPS). Similarly, an eastward fast ion flow known as the dawnside auroral polarization stream (DAPS) is observed within the Region 1 current on the dawnside. If the optical phenomenon triggered by SAID/SAPS corresponds to STEVE, a comparable optical phenomenon should be driven by DAPS. Thus far, however, such a phenomenon has not been reported. This study discovers, for the first time, a purple-colored optical phenomenon characterized by the fast eastward ion flows, a possible signature of DAPS, occurring poleward of the bright green arc in the post-midnight sector. We present color all-sky images obtained by a ground-based commercial digital camera, along with wide-coverage optical measurements and in-situ data from low-altitude satellites. The results imply that this glow requires not only a high-speed ion flow but also its sharp latitudinal gradient at the boundary between the Region 1 and 2. Graphical Abstracthttps://doi.org/10.1186/s40623-024-01995-9STEVEDAPSCommercial digital cameraOptical observationSwarmNOAA VIIRS |
| spellingShingle | Sota Nanjo Gabriel Arne Hofstra Kazuo Shiokawa Atsuki Shinbori Satonori Nozawa Keisuke Hosokawa Post-midnight purple arc and patches appeared on the high latitude part of the auroral oval: Dawnside counterpart of STEVE? Earth, Planets and Space STEVE DAPS Commercial digital camera Optical observation Swarm NOAA VIIRS |
| title | Post-midnight purple arc and patches appeared on the high latitude part of the auroral oval: Dawnside counterpart of STEVE? |
| title_full | Post-midnight purple arc and patches appeared on the high latitude part of the auroral oval: Dawnside counterpart of STEVE? |
| title_fullStr | Post-midnight purple arc and patches appeared on the high latitude part of the auroral oval: Dawnside counterpart of STEVE? |
| title_full_unstemmed | Post-midnight purple arc and patches appeared on the high latitude part of the auroral oval: Dawnside counterpart of STEVE? |
| title_short | Post-midnight purple arc and patches appeared on the high latitude part of the auroral oval: Dawnside counterpart of STEVE? |
| title_sort | post midnight purple arc and patches appeared on the high latitude part of the auroral oval dawnside counterpart of steve |
| topic | STEVE DAPS Commercial digital camera Optical observation Swarm NOAA VIIRS |
| url | https://doi.org/10.1186/s40623-024-01995-9 |
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