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The Dst index underestimates the solar cycle variation of geomagnetic activity

It is known that the correction of the Kyoto Dst index for the secular variation of the Earth's internal field produces a discontinuity in the Kyoto Dst index at the end of each year. We show that this secular correction also introduces a significant baseline error to the Kyoto Dst index that l...

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Detalles Bibliográficos
Autores principales: Temerin, Michael, Li, Xinlin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5036309/
https://www.ncbi.nlm.nih.gov/pubmed/27708993
http://dx.doi.org/10.1002/2015JA021467
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author Temerin, Michael
Li, Xinlin
author_facet Temerin, Michael
Li, Xinlin
author_sort Temerin, Michael
collection PubMed
description It is known that the correction of the Kyoto Dst index for the secular variation of the Earth's internal field produces a discontinuity in the Kyoto Dst index at the end of each year. We show that this secular correction also introduces a significant baseline error to the Kyoto Dst index that leads to an underestimate of the solar cycle variation of geomagnetic activity and of the strength of the ring current as measured by the Kyoto Dst index. Thus, the average value of the Kyoto Dst index would be approximately 13 nT more negative for the active year 2003 compared to quiet years 2006 and 2009 if the Kyoto Dst index properly measured the effects of the ring current and other currents that influence the Dst observatories. Discontinuities in the Kyoto Dst index at the end of each year have an average value of about 5 nT, but the discontinuity at the end of year 2002 was approximately 12 nT, and the discontinuity at the end of year 1982 may have been as large as 20 nT.
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spelling pubmed-50363092016-10-03 The Dst index underestimates the solar cycle variation of geomagnetic activity Temerin, Michael Li, Xinlin J Geophys Res Space Phys Research Articles It is known that the correction of the Kyoto Dst index for the secular variation of the Earth's internal field produces a discontinuity in the Kyoto Dst index at the end of each year. We show that this secular correction also introduces a significant baseline error to the Kyoto Dst index that leads to an underestimate of the solar cycle variation of geomagnetic activity and of the strength of the ring current as measured by the Kyoto Dst index. Thus, the average value of the Kyoto Dst index would be approximately 13 nT more negative for the active year 2003 compared to quiet years 2006 and 2009 if the Kyoto Dst index properly measured the effects of the ring current and other currents that influence the Dst observatories. Discontinuities in the Kyoto Dst index at the end of each year have an average value of about 5 nT, but the discontinuity at the end of year 2002 was approximately 12 nT, and the discontinuity at the end of year 1982 may have been as large as 20 nT. John Wiley and Sons Inc. 2015-07-23 2015-07 /pmc/articles/PMC5036309/ /pubmed/27708993 http://dx.doi.org/10.1002/2015JA021467 Text en ©2015. The Authors. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs (http://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
spellingShingle Research Articles
Temerin, Michael
Li, Xinlin
The Dst index underestimates the solar cycle variation of geomagnetic activity
title The Dst index underestimates the solar cycle variation of geomagnetic activity
title_full The Dst index underestimates the solar cycle variation of geomagnetic activity
title_fullStr The Dst index underestimates the solar cycle variation of geomagnetic activity
title_full_unstemmed The Dst index underestimates the solar cycle variation of geomagnetic activity
title_short The Dst index underestimates the solar cycle variation of geomagnetic activity
title_sort dst index underestimates the solar cycle variation of geomagnetic activity
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5036309/
https://www.ncbi.nlm.nih.gov/pubmed/27708993
http://dx.doi.org/10.1002/2015JA021467
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