Simultaneous observation of auroral substorm onset in Polar satellite global images and ground-based all-sky images
Substorm onset has originally been defined as a longitudinally extended sudden auroral brightening (Akasofu initial brightening: AIB) followed a few minutes later by an auroral poleward expansion in ground-based all-sky images (ASIs). In contrast, such clearly marked two-stage development has not be...
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ftkyotouniv:oai:repository.kulib.kyoto-u.ac.jp:2433/235015 2023-05-15T17:13:27+02:00 Simultaneous observation of auroral substorm onset in Polar satellite global images and ground-based all-sky images Ieda, Akimasa Kauristie, Kirsti Nishimura, Yukitoshi Miyashita, Yukinaga Frey, Harald U. Juusola, Liisa Whiter, Daniel Nosé, Masahito Fillingim, Matthew O. Honary, Farideh Rogers, Neil C. Miyoshi, Yoshizumi Miura, Tsubasa Kawashima, Takahiro Machida, Shinobu 能勢, 正仁 2018-05-04 application/pdf http://hdl.handle.net/2433/235015 eng eng Springer Nature 10.1186/s40623-018-0843-3 1880-5981 http://hdl.handle.net/2433/235015 Earth, Planets and Space 70 73 16K05568 / 26247082 / 16H04057 / 26610143 © The Author(s) 2018. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. CC-BY Substorm Auroral breakup Aurora Substorm onset Global images All-sky images Journal Article 2018 ftkyotouniv 2018-11-16T00:12:00Z Substorm onset has originally been defined as a longitudinally extended sudden auroral brightening (Akasofu initial brightening: AIB) followed a few minutes later by an auroral poleward expansion in ground-based all-sky images (ASIs). In contrast, such clearly marked two-stage development has not been evident in satellite-based global images (GIs). Instead, substorm onsets have been identified as localized sudden brightenings that expand immediately poleward. To resolve these differences, optical substorm onset signatures in GIs and ASIs are compared in this study for a substorm that occurred on December 7, 1999. For this substorm, the Polar satellite ultraviolet global imager was operated with a fixed-filter (170 nm) mode, enabling a higher time resolution (37 s) than usual to resolve the possible two-stage development. These data were compared with 20-s resolution green-line (557.7 nm) ASIs at Muonio in Finland. The ASIs revealed the AIB at 2124:50 UT and the subsequent poleward expansion at 2127:50 UT, whereas the GIs revealed only an onset brightening that started at 2127:49 UT. Thus, the onset in the GIs was delayed relative to the AIB and in fact agreed with the poleward expansion in the ASIs. The fact that the AIB was not evident in the GIs may be attributed to the limited spatial resolution of GIs for thin auroral arc brightenings. The implications of these results for the definition of substorm onset are discussed herein. Article in Journal/Newspaper Muonio Kyoto University Research Information Repository (KURENAI) Muonio ENVELOPE(23.833,23.833,67.833,67.833) |
institution |
Open Polar |
collection |
Kyoto University Research Information Repository (KURENAI) |
op_collection_id |
ftkyotouniv |
language |
English |
topic |
Substorm Auroral breakup Aurora Substorm onset Global images All-sky images |
spellingShingle |
Substorm Auroral breakup Aurora Substorm onset Global images All-sky images Ieda, Akimasa Kauristie, Kirsti Nishimura, Yukitoshi Miyashita, Yukinaga Frey, Harald U. Juusola, Liisa Whiter, Daniel Nosé, Masahito Fillingim, Matthew O. Honary, Farideh Rogers, Neil C. Miyoshi, Yoshizumi Miura, Tsubasa Kawashima, Takahiro Machida, Shinobu Simultaneous observation of auroral substorm onset in Polar satellite global images and ground-based all-sky images |
topic_facet |
Substorm Auroral breakup Aurora Substorm onset Global images All-sky images |
description |
Substorm onset has originally been defined as a longitudinally extended sudden auroral brightening (Akasofu initial brightening: AIB) followed a few minutes later by an auroral poleward expansion in ground-based all-sky images (ASIs). In contrast, such clearly marked two-stage development has not been evident in satellite-based global images (GIs). Instead, substorm onsets have been identified as localized sudden brightenings that expand immediately poleward. To resolve these differences, optical substorm onset signatures in GIs and ASIs are compared in this study for a substorm that occurred on December 7, 1999. For this substorm, the Polar satellite ultraviolet global imager was operated with a fixed-filter (170 nm) mode, enabling a higher time resolution (37 s) than usual to resolve the possible two-stage development. These data were compared with 20-s resolution green-line (557.7 nm) ASIs at Muonio in Finland. The ASIs revealed the AIB at 2124:50 UT and the subsequent poleward expansion at 2127:50 UT, whereas the GIs revealed only an onset brightening that started at 2127:49 UT. Thus, the onset in the GIs was delayed relative to the AIB and in fact agreed with the poleward expansion in the ASIs. The fact that the AIB was not evident in the GIs may be attributed to the limited spatial resolution of GIs for thin auroral arc brightenings. The implications of these results for the definition of substorm onset are discussed herein. |
author2 |
能勢, 正仁 |
format |
Article in Journal/Newspaper |
author |
Ieda, Akimasa Kauristie, Kirsti Nishimura, Yukitoshi Miyashita, Yukinaga Frey, Harald U. Juusola, Liisa Whiter, Daniel Nosé, Masahito Fillingim, Matthew O. Honary, Farideh Rogers, Neil C. Miyoshi, Yoshizumi Miura, Tsubasa Kawashima, Takahiro Machida, Shinobu |
author_facet |
Ieda, Akimasa Kauristie, Kirsti Nishimura, Yukitoshi Miyashita, Yukinaga Frey, Harald U. Juusola, Liisa Whiter, Daniel Nosé, Masahito Fillingim, Matthew O. Honary, Farideh Rogers, Neil C. Miyoshi, Yoshizumi Miura, Tsubasa Kawashima, Takahiro Machida, Shinobu |
author_sort |
Ieda, Akimasa |
title |
Simultaneous observation of auroral substorm onset in Polar satellite global images and ground-based all-sky images |
title_short |
Simultaneous observation of auroral substorm onset in Polar satellite global images and ground-based all-sky images |
title_full |
Simultaneous observation of auroral substorm onset in Polar satellite global images and ground-based all-sky images |
title_fullStr |
Simultaneous observation of auroral substorm onset in Polar satellite global images and ground-based all-sky images |
title_full_unstemmed |
Simultaneous observation of auroral substorm onset in Polar satellite global images and ground-based all-sky images |
title_sort |
simultaneous observation of auroral substorm onset in polar satellite global images and ground-based all-sky images |
publisher |
Springer Nature |
publishDate |
2018 |
url |
http://hdl.handle.net/2433/235015 |
long_lat |
ENVELOPE(23.833,23.833,67.833,67.833) |
geographic |
Muonio |
geographic_facet |
Muonio |
genre |
Muonio |
genre_facet |
Muonio |
op_relation |
10.1186/s40623-018-0843-3 1880-5981 http://hdl.handle.net/2433/235015 Earth, Planets and Space 70 73 16K05568 / 26247082 / 16H04057 / 26610143 |
op_rights |
© The Author(s) 2018. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
op_rightsnorm |
CC-BY |
_version_ |
1766070561099743232 |