Empirical modelling of auroral absorption during disturbed periods of interplanetary coronal mass ejection events
Energetic charged particle precipitation associated with solar wind perturbations causes enhanced high-frequency radiowave absorption in the high-latitude ionosphere. This study models 38.2 MHz cosmic noise absorption (CNA) by utilising measurements from the Imaging Riometer for Ionospheric Studies...
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ftulancaster:oai:eprints.lancs.ac.uk:144771 2023-08-27T04:10:24+02:00 Empirical modelling of auroral absorption during disturbed periods of interplanetary coronal mass ejection events Ogunmodimu, Olugbenga Honary, Farideh Rogers, Neil Richardson, Ian Nwankwo, Victor Adebisi, Bamidele 2020-06-20 text https://eprints.lancs.ac.uk/id/eprint/144771/ https://eprints.lancs.ac.uk/id/eprint/144771/1/Ogunmodimu_et_al._2020_accepted_manuscript.pdf https://doi.org/10.1016/j.jastp.2020.105364 en eng https://eprints.lancs.ac.uk/id/eprint/144771/1/Ogunmodimu_et_al._2020_accepted_manuscript.pdf Ogunmodimu, Olugbenga and Honary, Farideh and Rogers, Neil and Richardson, Ian and Nwankwo, Victor and Adebisi, Bamidele (2020) Empirical modelling of auroral absorption during disturbed periods of interplanetary coronal mass ejection events. Journal of Atmospheric and Solar-Terrestrial Physics. ISSN 1364-6826 creative_commons_attribution_noncommercial_noderivatives_4_0_international_license Journal Article PeerReviewed 2020 ftulancaster https://doi.org/10.1016/j.jastp.2020.105364 2023-08-03T22:38:17Z Energetic charged particle precipitation associated with solar wind perturbations causes enhanced high-frequency radiowave absorption in the high-latitude ionosphere. This study models 38.2 MHz cosmic noise absorption (CNA) by utilising measurements from the Imaging Riometer for Ionospheric Studies (IRIS) at Kilpisjärvi, Finland obtained during solar cycle 23 (1996-2009) associated with the passage of interplanetary coronal mass ejections (ICMEs) past Earth; ICMEs are a major driver of enhanced geomagnetic activity. Superposed epoch analysis suggests that the absorption vs. time profile depends on whether ICME arrival occurs in the day-time (10-14 MLT) or night-time (22-02 MLT) for IRIS, with peak absorption occurring ~2-3 hours ahead of ICME arrival or ~4 hours after ICME arrival, respectively. We determine which combinations of solar wind and IMF parameters show the best correlation with the absorption associated with day-time or night-time arriving ICMEs using superposed epoch analysis and the least squares estimation method. Various combinations of solar wind parameters (including bulk velocity v, density n, and the interplanetary magnetic field north and south components Bz and the SYMH geomagnetic index), have been ranked to obtain the best coupling function for the absorption associated with day- and night-time arriving ICMEs. The absorption for day-time events is found to correlate closely with the solar wind dynamic pressure, SYMH, and the northward direction of the Bz while the absorption for night-time events is most closely related to the direction of the Bz and SYMH. The coupling functions are found to model the observed absorption successfully, with correlation coefficients of ~0.7-0.8 between the observed and modelled absorption. Article in Journal/Newspaper Kilpisjärvi Lancaster University: Lancaster Eprints Kilpisjärvi ENVELOPE(20.767,20.767,69.034,69.034) Journal of Atmospheric and Solar-Terrestrial Physics 207 105364 |
institution |
Open Polar |
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Lancaster University: Lancaster Eprints |
op_collection_id |
ftulancaster |
language |
English |
description |
Energetic charged particle precipitation associated with solar wind perturbations causes enhanced high-frequency radiowave absorption in the high-latitude ionosphere. This study models 38.2 MHz cosmic noise absorption (CNA) by utilising measurements from the Imaging Riometer for Ionospheric Studies (IRIS) at Kilpisjärvi, Finland obtained during solar cycle 23 (1996-2009) associated with the passage of interplanetary coronal mass ejections (ICMEs) past Earth; ICMEs are a major driver of enhanced geomagnetic activity. Superposed epoch analysis suggests that the absorption vs. time profile depends on whether ICME arrival occurs in the day-time (10-14 MLT) or night-time (22-02 MLT) for IRIS, with peak absorption occurring ~2-3 hours ahead of ICME arrival or ~4 hours after ICME arrival, respectively. We determine which combinations of solar wind and IMF parameters show the best correlation with the absorption associated with day-time or night-time arriving ICMEs using superposed epoch analysis and the least squares estimation method. Various combinations of solar wind parameters (including bulk velocity v, density n, and the interplanetary magnetic field north and south components Bz and the SYMH geomagnetic index), have been ranked to obtain the best coupling function for the absorption associated with day- and night-time arriving ICMEs. The absorption for day-time events is found to correlate closely with the solar wind dynamic pressure, SYMH, and the northward direction of the Bz while the absorption for night-time events is most closely related to the direction of the Bz and SYMH. The coupling functions are found to model the observed absorption successfully, with correlation coefficients of ~0.7-0.8 between the observed and modelled absorption. |
format |
Article in Journal/Newspaper |
author |
Ogunmodimu, Olugbenga Honary, Farideh Rogers, Neil Richardson, Ian Nwankwo, Victor Adebisi, Bamidele |
spellingShingle |
Ogunmodimu, Olugbenga Honary, Farideh Rogers, Neil Richardson, Ian Nwankwo, Victor Adebisi, Bamidele Empirical modelling of auroral absorption during disturbed periods of interplanetary coronal mass ejection events |
author_facet |
Ogunmodimu, Olugbenga Honary, Farideh Rogers, Neil Richardson, Ian Nwankwo, Victor Adebisi, Bamidele |
author_sort |
Ogunmodimu, Olugbenga |
title |
Empirical modelling of auroral absorption during disturbed periods of interplanetary coronal mass ejection events |
title_short |
Empirical modelling of auroral absorption during disturbed periods of interplanetary coronal mass ejection events |
title_full |
Empirical modelling of auroral absorption during disturbed periods of interplanetary coronal mass ejection events |
title_fullStr |
Empirical modelling of auroral absorption during disturbed periods of interplanetary coronal mass ejection events |
title_full_unstemmed |
Empirical modelling of auroral absorption during disturbed periods of interplanetary coronal mass ejection events |
title_sort |
empirical modelling of auroral absorption during disturbed periods of interplanetary coronal mass ejection events |
publishDate |
2020 |
url |
https://eprints.lancs.ac.uk/id/eprint/144771/ https://eprints.lancs.ac.uk/id/eprint/144771/1/Ogunmodimu_et_al._2020_accepted_manuscript.pdf https://doi.org/10.1016/j.jastp.2020.105364 |
long_lat |
ENVELOPE(20.767,20.767,69.034,69.034) |
geographic |
Kilpisjärvi |
geographic_facet |
Kilpisjärvi |
genre |
Kilpisjärvi |
genre_facet |
Kilpisjärvi |
op_relation |
https://eprints.lancs.ac.uk/id/eprint/144771/1/Ogunmodimu_et_al._2020_accepted_manuscript.pdf Ogunmodimu, Olugbenga and Honary, Farideh and Rogers, Neil and Richardson, Ian and Nwankwo, Victor and Adebisi, Bamidele (2020) Empirical modelling of auroral absorption during disturbed periods of interplanetary coronal mass ejection events. Journal of Atmospheric and Solar-Terrestrial Physics. ISSN 1364-6826 |
op_rights |
creative_commons_attribution_noncommercial_noderivatives_4_0_international_license |
op_doi |
https://doi.org/10.1016/j.jastp.2020.105364 |
container_title |
Journal of Atmospheric and Solar-Terrestrial Physics |
container_volume |
207 |
container_start_page |
105364 |
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1775352405607579648 |