Reconstruction of geomagnetic activity and near-Earth interplanetary conditions over the past 167 yr – Part 2: A new reconstruction of the interplanetary magnetic field
We present a new reconstruction of the interplanetary magnetic field (IMF, <i>B</i>) for 1846–2012 with a full analysis of errors, based on the homogeneously constructed IDV(1d) composite of geomagnetic activity presented in Part 1 (Lockwood et al., 2013a). Analysis of the dependence...
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Copernicus Publications
2013-11-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/31/1979/2013/angeo-31-1979-2013.pdf |
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doaj-01e9f13e5585471496593c369792a65f2020-11-25T00:01:40ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762013-11-01311979199210.5194/angeo-31-1979-2013Reconstruction of geomagnetic activity and near-Earth interplanetary conditions over the past 167 yr – Part 2: A new reconstruction of the interplanetary magnetic fieldM. Lockwood0L. Barnard1H. Nevanlinna2M. J. Owens3R. G. Harrison4A. P. Rouillard5C. J. Davis6Meteorology Department, University of Reading, Reading, Berkshire, UKMeteorology Department, University of Reading, Reading, Berkshire, UKFinnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, FinlandMeteorology Department, University of Reading, Reading, Berkshire, UKMeteorology Department, University of Reading, Reading, Berkshire, UKInstitut de Recherche en Astrophysique et Planétologie, 9 Ave. du Colonel Roche, BP 44 346, 31028 Toulouse Cedex 4, FranceMeteorology Department, University of Reading, Reading, Berkshire, UKWe present a new reconstruction of the interplanetary magnetic field (IMF, <i>B</i>) for 1846–2012 with a full analysis of errors, based on the homogeneously constructed IDV(1d) composite of geomagnetic activity presented in Part 1 (Lockwood et al., 2013a). Analysis of the dependence of the commonly used geomagnetic indices on solar wind parameters is presented which helps explain why annual means of interdiurnal range data, such as the new composite, depend only on the IMF with only a very weak influence of the solar wind flow speed. The best results are obtained using a polynomial (rather than a linear) fit of the form <i>B</i> = χ · (IDV(1d) − β)<sup>α</sup> with best-fit coefficients χ = 3.469, β = 1.393 nT, and α = 0.420. The results are contrasted with the reconstruction of the IMF since 1835 by Svalgaard and Cliver (2010).https://www.ann-geophys.net/31/1979/2013/angeo-31-1979-2013.pdf |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
M. Lockwood L. Barnard H. Nevanlinna M. J. Owens R. G. Harrison A. P. Rouillard C. J. Davis |
| spellingShingle |
M. Lockwood L. Barnard H. Nevanlinna M. J. Owens R. G. Harrison A. P. Rouillard C. J. Davis Reconstruction of geomagnetic activity and near-Earth interplanetary conditions over the past 167 yr – Part 2: A new reconstruction of the interplanetary magnetic field Annales Geophysicae |
| author_facet |
M. Lockwood L. Barnard H. Nevanlinna M. J. Owens R. G. Harrison A. P. Rouillard C. J. Davis |
| author_sort |
M. Lockwood |
| title |
Reconstruction of geomagnetic activity and near-Earth interplanetary conditions over the past 167 yr – Part 2: A new reconstruction of the interplanetary magnetic field |
| title_short |
Reconstruction of geomagnetic activity and near-Earth interplanetary conditions over the past 167 yr – Part 2: A new reconstruction of the interplanetary magnetic field |
| title_full |
Reconstruction of geomagnetic activity and near-Earth interplanetary conditions over the past 167 yr – Part 2: A new reconstruction of the interplanetary magnetic field |
| title_fullStr |
Reconstruction of geomagnetic activity and near-Earth interplanetary conditions over the past 167 yr – Part 2: A new reconstruction of the interplanetary magnetic field |
| title_full_unstemmed |
Reconstruction of geomagnetic activity and near-Earth interplanetary conditions over the past 167 yr – Part 2: A new reconstruction of the interplanetary magnetic field |
| title_sort |
reconstruction of geomagnetic activity and near-earth interplanetary conditions over the past 167 yr – part 2: a new reconstruction of the interplanetary magnetic field |
| publisher |
Copernicus Publications |
| series |
Annales Geophysicae |
| issn |
0992-7689 1432-0576 |
| publishDate |
2013-11-01 |
| description |
We present a new reconstruction of the
interplanetary magnetic field (IMF, <i>B</i>) for 1846–2012 with a full analysis of
errors, based on the homogeneously constructed IDV(1d) composite of geomagnetic
activity presented in Part 1 (Lockwood et al., 2013a). Analysis of the dependence of the
commonly used geomagnetic indices on solar wind parameters is presented
which helps explain why annual means of interdiurnal range data, such as the
new composite, depend only on the IMF with only a very weak influence of the
solar wind flow speed. The best results are obtained using a polynomial
(rather than a linear) fit of the form <i>B</i> = χ · (IDV(1d) − β)<sup>α</sup>
with best-fit coefficients χ = 3.469, β =
1.393 nT, and α = 0.420. The results are contrasted with the
reconstruction of the IMF since 1835 by Svalgaard and Cliver (2010). |
| url |
https://www.ann-geophys.net/31/1979/2013/angeo-31-1979-2013.pdf |
| work_keys_str_mv |
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