Association of ionospheric storms and substorms of Global Electron Content with proxy AE index
Storm time modeling of Global Electron Content (GEC) calculated from GIM-TEC for 1999-2013 is associated with new proxy of Auroral Electrojet variability expressed as a smoothed and normalized Auroral Electrojet index (AEsn). The variability in GEC is captured by the computation of DGEC which is obt...
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ftbilkentuniv:oai:repository.bilkent.edu.tr:11693/23203 2023-05-15T13:38:16+02:00 Association of ionospheric storms and substorms of Global Electron Content with proxy AE index Yenen, S.D. Gulyaeva, T.L. Arikan F. Arikan, O. 2015 application/pdf http://hdl.handle.net/11693/23203 https://doi.org/10.1016/j.asr.2015.06.025 English eng Elsevier Ltd http://dx.doi.org/10.1016/j.asr.2015.06.025 2731177 http://hdl.handle.net/11693/23203 doi:10.1016/j.asr.2015.06.025 Advances in Space Research Auroral Electrojet (AE) index Geomagnetic storms Global Electron Content (GEC) Ionosphere Space weather Total Electron Content (TEC) Atmospheric electricity Electrons Geomagnetism Auroral electrojet indices Geomagnetic storm Total electron content Storms Article 2015 ftbilkentuniv https://doi.org/10.1016/j.asr.2015.06.025 2022-04-13T19:23:07Z Storm time modeling of Global Electron Content (GEC) calculated from GIM-TEC for 1999-2013 is associated with new proxy of Auroral Electrojet variability expressed as a smoothed and normalized Auroral Electrojet index (AEsn). The variability in GEC is captured by the computation of DGEC which is obtained by taking the hourly ratio of instant GEC to median of GEC values at the same hour of 7 preceding days. The storm onset is determined by a joint analysis of variations in IMF-B magnitude, its derivative (dB/dt) and direction of IMF-Bz together with sudden increase in AE exceeding 900 nT. The start of the pre-storm period is chosen to be 7 h prior to the storm onset time and the storm recovery period ends 41 h after the storm onset. The hourly AEsn is related to DGEC during the storm period through a polynomial whose coefficients are estimated in the linear least squares sense. Estimated coefficients are examined and grouped with respect to different kinds of auroral storms. Examples of modeling methodology are provided using four different kinds of intense storms and substorms, namely, Positive Arctic, Positive Antarctic, Negative Arctic and Negative Antarctic that occurred between 1999 and 2013. The estimated coefficients for storm periods are compared with those of non-storm periods. It is observed that the positive correlation between the increase of AE and GEC can be a promising precursor of space weather variability. © 2015 COSPAR. Published by Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Arctic Bilkent University: Institutional Repository Antarctic Arctic Advances in Space Research 56 7 1343 1353 |
institution |
Open Polar |
collection |
Bilkent University: Institutional Repository |
op_collection_id |
ftbilkentuniv |
language |
English |
topic |
Auroral Electrojet (AE) index Geomagnetic storms Global Electron Content (GEC) Ionosphere Space weather Total Electron Content (TEC) Atmospheric electricity Electrons Geomagnetism Auroral electrojet indices Geomagnetic storm Total electron content Storms |
spellingShingle |
Auroral Electrojet (AE) index Geomagnetic storms Global Electron Content (GEC) Ionosphere Space weather Total Electron Content (TEC) Atmospheric electricity Electrons Geomagnetism Auroral electrojet indices Geomagnetic storm Total electron content Storms Yenen, S.D. Gulyaeva, T.L. Arikan F. Arikan, O. Association of ionospheric storms and substorms of Global Electron Content with proxy AE index |
topic_facet |
Auroral Electrojet (AE) index Geomagnetic storms Global Electron Content (GEC) Ionosphere Space weather Total Electron Content (TEC) Atmospheric electricity Electrons Geomagnetism Auroral electrojet indices Geomagnetic storm Total electron content Storms |
description |
Storm time modeling of Global Electron Content (GEC) calculated from GIM-TEC for 1999-2013 is associated with new proxy of Auroral Electrojet variability expressed as a smoothed and normalized Auroral Electrojet index (AEsn). The variability in GEC is captured by the computation of DGEC which is obtained by taking the hourly ratio of instant GEC to median of GEC values at the same hour of 7 preceding days. The storm onset is determined by a joint analysis of variations in IMF-B magnitude, its derivative (dB/dt) and direction of IMF-Bz together with sudden increase in AE exceeding 900 nT. The start of the pre-storm period is chosen to be 7 h prior to the storm onset time and the storm recovery period ends 41 h after the storm onset. The hourly AEsn is related to DGEC during the storm period through a polynomial whose coefficients are estimated in the linear least squares sense. Estimated coefficients are examined and grouped with respect to different kinds of auroral storms. Examples of modeling methodology are provided using four different kinds of intense storms and substorms, namely, Positive Arctic, Positive Antarctic, Negative Arctic and Negative Antarctic that occurred between 1999 and 2013. The estimated coefficients for storm periods are compared with those of non-storm periods. It is observed that the positive correlation between the increase of AE and GEC can be a promising precursor of space weather variability. © 2015 COSPAR. Published by Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Yenen, S.D. Gulyaeva, T.L. Arikan F. Arikan, O. |
author_facet |
Yenen, S.D. Gulyaeva, T.L. Arikan F. Arikan, O. |
author_sort |
Yenen, S.D. |
title |
Association of ionospheric storms and substorms of Global Electron Content with proxy AE index |
title_short |
Association of ionospheric storms and substorms of Global Electron Content with proxy AE index |
title_full |
Association of ionospheric storms and substorms of Global Electron Content with proxy AE index |
title_fullStr |
Association of ionospheric storms and substorms of Global Electron Content with proxy AE index |
title_full_unstemmed |
Association of ionospheric storms and substorms of Global Electron Content with proxy AE index |
title_sort |
association of ionospheric storms and substorms of global electron content with proxy ae index |
publisher |
Elsevier Ltd |
publishDate |
2015 |
url |
http://hdl.handle.net/11693/23203 https://doi.org/10.1016/j.asr.2015.06.025 |
geographic |
Antarctic Arctic |
geographic_facet |
Antarctic Arctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
Advances in Space Research |
op_relation |
http://dx.doi.org/10.1016/j.asr.2015.06.025 2731177 http://hdl.handle.net/11693/23203 doi:10.1016/j.asr.2015.06.025 |
op_doi |
https://doi.org/10.1016/j.asr.2015.06.025 |
container_title |
Advances in Space Research |
container_volume |
56 |
container_issue |
7 |
container_start_page |
1343 |
op_container_end_page |
1353 |
_version_ |
1766103262978637824 |