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Centennial changes in the solar wind speed and in the open solar flux

Rouillard, A. P., Lockwood, M. and Finch, I. (2007) Centennial changes in the solar wind speed and in the open solar flux. Journal of Geophysical Research, 112. A05103. ISSN 0148-0227

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To link to this article DOI: 10.1029/2006JA012130

Abstract/Summary

We use combinations of geomagnetic indices, based on both variation range and hourly means, to derive the solar wind flow speed, the interplanetary magnetic field strength at 1 AU and the total open solar flux between 1895 and the present. We analyze the effects of the regression procedure and geomagnetic indices used by adopting four analysis methods. These give a mean interplanetary magnetic field strength increase of 45.1 ± 4.5% between 1903 and 1956, associated with a 14.4 ± 0.7% rise in the solar wind speed. We use averaging timescales of 1 and 2 days to allow for the difference between the magnetic fluxes threading the coronal source surface and the heliocentric sphere at 1 AU. The largest uncertainties originate from the choice of regression procedure: the average of all eight estimates of the rise in open solar flux is 73.0 ± 5.0%, but the best procedure, giving the narrowest and most symmetric distribution of fit residuals, yields 87.3 ± 3.9%.

Item Type:Article
Refereed:Yes
Divisions:No Reading authors. Back catalogue items
Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:38542
Uncontrolled Keywords:open solar flux; solar wind; long-term change
Publisher:American Geophysical Union

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