Spatial scaling of optical fluctuations during substorm-time aurora
A study of statistical features of auroras during substorm activity is presented, emphasizing characteristics which are commonly applied to turbulent flows. Data from all-sky television (TV) observations from the Barentsburg observatory (Svalbard) have been used. Features of the probability density...
Published in: | Annales Geophysicae |
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ftcopernicus:oai:publications.copernicus.org:angeo36155 2023-05-15T15:39:16+02:00 Spatial scaling of optical fluctuations during substorm-time aurora Kozelov, B. V. Rypdal, K. 2018-09-27 application/pdf https://doi.org/10.5194/angeo-25-915-2007 https://angeo.copernicus.org/articles/25/915/2007/ eng eng doi:10.5194/angeo-25-915-2007 https://angeo.copernicus.org/articles/25/915/2007/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.5194/angeo-25-915-2007 2020-07-20T16:27:05Z A study of statistical features of auroras during substorm activity is presented, emphasizing characteristics which are commonly applied to turbulent flows. Data from all-sky television (TV) observations from the Barentsburg observatory (Svalbard) have been used. Features of the probability density function (PDF) of auroral fluctuations have been examined at different spatial scales. We find that the observed PDFs generally have a non-Gaussian, heavy-tailed shape. The generalized structure function (GSF) for the auroral luminosity fluctuations has been analyzed to determine the scaling properties of the higher (up to 6) order moments, and the evolution of the scaling indices during the actual substorm event has been determined. The scaling features obtained can be interpreted as signatures of turbulent motion of the magnetosphere-ionosphere plasma. Relations to previously obtained results of avalanche analysis of the same event, as well as possible implications for the validity of self-organized criticality models and turbulence models of the substorm activity, are discussed. Text Barentsburg Svalbard Copernicus Publications: E-Journals Barentsburg ENVELOPE(14.212,14.212,78.064,78.064) Svalbard Annales Geophysicae 25 4 915 927 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
A study of statistical features of auroras during substorm activity is presented, emphasizing characteristics which are commonly applied to turbulent flows. Data from all-sky television (TV) observations from the Barentsburg observatory (Svalbard) have been used. Features of the probability density function (PDF) of auroral fluctuations have been examined at different spatial scales. We find that the observed PDFs generally have a non-Gaussian, heavy-tailed shape. The generalized structure function (GSF) for the auroral luminosity fluctuations has been analyzed to determine the scaling properties of the higher (up to 6) order moments, and the evolution of the scaling indices during the actual substorm event has been determined. The scaling features obtained can be interpreted as signatures of turbulent motion of the magnetosphere-ionosphere plasma. Relations to previously obtained results of avalanche analysis of the same event, as well as possible implications for the validity of self-organized criticality models and turbulence models of the substorm activity, are discussed. |
format |
Text |
author |
Kozelov, B. V. Rypdal, K. |
spellingShingle |
Kozelov, B. V. Rypdal, K. Spatial scaling of optical fluctuations during substorm-time aurora |
author_facet |
Kozelov, B. V. Rypdal, K. |
author_sort |
Kozelov, B. V. |
title |
Spatial scaling of optical fluctuations during substorm-time aurora |
title_short |
Spatial scaling of optical fluctuations during substorm-time aurora |
title_full |
Spatial scaling of optical fluctuations during substorm-time aurora |
title_fullStr |
Spatial scaling of optical fluctuations during substorm-time aurora |
title_full_unstemmed |
Spatial scaling of optical fluctuations during substorm-time aurora |
title_sort |
spatial scaling of optical fluctuations during substorm-time aurora |
publishDate |
2018 |
url |
https://doi.org/10.5194/angeo-25-915-2007 https://angeo.copernicus.org/articles/25/915/2007/ |
long_lat |
ENVELOPE(14.212,14.212,78.064,78.064) |
geographic |
Barentsburg Svalbard |
geographic_facet |
Barentsburg Svalbard |
genre |
Barentsburg Svalbard |
genre_facet |
Barentsburg Svalbard |
op_source |
eISSN: 1432-0576 |
op_relation |
doi:10.5194/angeo-25-915-2007 https://angeo.copernicus.org/articles/25/915/2007/ |
op_doi |
https://doi.org/10.5194/angeo-25-915-2007 |
container_title |
Annales Geophysicae |
container_volume |
25 |
container_issue |
4 |
container_start_page |
915 |
op_container_end_page |
927 |
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1766370776313757696 |