The statistical dependence of auroral absorption on geomagnetic and solar wind parameters

Data from the Imaging Riometer for Ionospheric Studies (IRIS) at Kilpisjärvi, Finland, have been compiled to form statistics of auroral absorption based on seven years of observations. In a previous study a linear relationship between the logarithm of the absorption and the Kp index provided a link...

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Published in:Annales Geophysicae
Main Authors: Kavanagh, A. J., Kosch, M. J., Honary, F., Senior, A., Marple, S. R., Woodfield, E. E., McCrea, I. W.
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2004
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Online Access:https://doi.org/10.5194/angeo-22-877-2004
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spelling ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00035003 2023-05-15T17:03:44+02:00 The statistical dependence of auroral absorption on geomagnetic and solar wind parameters Kavanagh, A. J. Kosch, M. J. Honary, F. Senior, A. Marple, S. R. Woodfield, E. E. McCrea, I. W. 2004-03 electronic https://doi.org/10.5194/angeo-22-877-2004 https://noa.gwlb.de/receive/cop_mods_00035003 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00034957/angeo-22-877-2004.pdf https://angeo.copernicus.org/articles/22/877/2004/angeo-22-877-2004.pdf eng eng Copernicus Publications Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-22-877-2004 https://noa.gwlb.de/receive/cop_mods_00035003 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00034957/angeo-22-877-2004.pdf https://angeo.copernicus.org/articles/22/877/2004/angeo-22-877-2004.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2004 ftnonlinearchiv https://doi.org/10.5194/angeo-22-877-2004 2022-02-08T22:44:56Z Data from the Imaging Riometer for Ionospheric Studies (IRIS) at Kilpisjärvi, Finland, have been compiled to form statistics of auroral absorption based on seven years of observations. In a previous study a linear relationship between the logarithm of the absorption and the Kp index provided a link between the observations of precipitation with the level of geomagnetic activity. A better fit to the absorption data is found in the form of a quadratic in Kp for eight magnetic local time sectors. Past statistical investigations of absorption have hinted at the possibility of using the solar wind velocity as a proxy for the auroral absorption, although the lack of available satellite data made such an investigation difficult. Here we employ data from the solar wind monitors, WIND and ACE, and derive a linear relationship between the solar wind velocity and the cosmic noise absorption at IRIS for the same eight magnetic local time sectors. As far as the authors are aware this is the first time that in situ measurements of the solar wind velocity have been used to create a direct link with absorption on a statistical basis. The results are promising although, it is clear that some other factor is necessary in providing reliable absorption predictions. Due to the substorm related nature of auroral absorption, this is likely formed by the recent time history of the geomagnetic activity, or by some other indicator of the energy stored within the magnetotail. For example, a dependence on the southward IMF (interplanetary magnetic field) is demonstrated with absorption increasing with successive decreases in Bz; a northward IMF appears to have little effect and neither does the eastward component, By. Key words. Magnetospheric physics (energetic particles, precipitating; solar wind-magnetosphere interactions) – Ionosphere (modeling and forecasting) Article in Journal/Newspaper Kilpisjärvi Niedersächsisches Online-Archiv NOA Kilpisjärvi ENVELOPE(20.767,20.767,69.034,69.034) Annales Geophysicae 22 3 877 887
institution Open Polar
collection Niedersächsisches Online-Archiv NOA
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language English
topic article
Verlagsveröffentlichung
spellingShingle article
Verlagsveröffentlichung
Kavanagh, A. J.
Kosch, M. J.
Honary, F.
Senior, A.
Marple, S. R.
Woodfield, E. E.
McCrea, I. W.
The statistical dependence of auroral absorption on geomagnetic and solar wind parameters
topic_facet article
Verlagsveröffentlichung
description Data from the Imaging Riometer for Ionospheric Studies (IRIS) at Kilpisjärvi, Finland, have been compiled to form statistics of auroral absorption based on seven years of observations. In a previous study a linear relationship between the logarithm of the absorption and the Kp index provided a link between the observations of precipitation with the level of geomagnetic activity. A better fit to the absorption data is found in the form of a quadratic in Kp for eight magnetic local time sectors. Past statistical investigations of absorption have hinted at the possibility of using the solar wind velocity as a proxy for the auroral absorption, although the lack of available satellite data made such an investigation difficult. Here we employ data from the solar wind monitors, WIND and ACE, and derive a linear relationship between the solar wind velocity and the cosmic noise absorption at IRIS for the same eight magnetic local time sectors. As far as the authors are aware this is the first time that in situ measurements of the solar wind velocity have been used to create a direct link with absorption on a statistical basis. The results are promising although, it is clear that some other factor is necessary in providing reliable absorption predictions. Due to the substorm related nature of auroral absorption, this is likely formed by the recent time history of the geomagnetic activity, or by some other indicator of the energy stored within the magnetotail. For example, a dependence on the southward IMF (interplanetary magnetic field) is demonstrated with absorption increasing with successive decreases in Bz; a northward IMF appears to have little effect and neither does the eastward component, By. Key words. Magnetospheric physics (energetic particles, precipitating; solar wind-magnetosphere interactions) – Ionosphere (modeling and forecasting)
format Article in Journal/Newspaper
author Kavanagh, A. J.
Kosch, M. J.
Honary, F.
Senior, A.
Marple, S. R.
Woodfield, E. E.
McCrea, I. W.
author_facet Kavanagh, A. J.
Kosch, M. J.
Honary, F.
Senior, A.
Marple, S. R.
Woodfield, E. E.
McCrea, I. W.
author_sort Kavanagh, A. J.
title The statistical dependence of auroral absorption on geomagnetic and solar wind parameters
title_short The statistical dependence of auroral absorption on geomagnetic and solar wind parameters
title_full The statistical dependence of auroral absorption on geomagnetic and solar wind parameters
title_fullStr The statistical dependence of auroral absorption on geomagnetic and solar wind parameters
title_full_unstemmed The statistical dependence of auroral absorption on geomagnetic and solar wind parameters
title_sort statistical dependence of auroral absorption on geomagnetic and solar wind parameters
publisher Copernicus Publications
publishDate 2004
url https://doi.org/10.5194/angeo-22-877-2004
https://noa.gwlb.de/receive/cop_mods_00035003
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00034957/angeo-22-877-2004.pdf
https://angeo.copernicus.org/articles/22/877/2004/angeo-22-877-2004.pdf
long_lat ENVELOPE(20.767,20.767,69.034,69.034)
geographic Kilpisjärvi
geographic_facet Kilpisjärvi
genre Kilpisjärvi
genre_facet Kilpisjärvi
op_relation Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576
https://doi.org/10.5194/angeo-22-877-2004
https://noa.gwlb.de/receive/cop_mods_00035003
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00034957/angeo-22-877-2004.pdf
https://angeo.copernicus.org/articles/22/877/2004/angeo-22-877-2004.pdf
op_rights uneingeschränkt
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op_doi https://doi.org/10.5194/angeo-22-877-2004
container_title Annales Geophysicae
container_volume 22
container_issue 3
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