J. Space Weather Space Clim.
Volume 7, 2017
|Number of page(s)||19|
|Published online||24 October 2017|
Space climate and space weather over the past 400 years: 1. The power input to the magnetosphere
Department of Meteorology, University of Reading,
RG6 6BB, UK
* Corresponding author: firstname.lastname@example.org
Accepted: 16 August 2017
Using information on geomagnetic activity, sunspot numbers and cosmogenic isotopes, supported by historic eclipse images and in conjunction with models, it has been possible to reconstruct annual means of solar wind speed and number density and heliospheric magnetic field (HMF) intensity since 1611, when telescopic observations of sunspots began. These models are developed and tuned using data recorded by near-Earth interplanetary spacecraft and by solar magnetograms over the past 53 years. In this paper, we use these reconstructions to quantify power input into the magnetosphere over the past 400 years. For each year, both the annual mean power input is computed and its distribution in daily means. This is possible because the distribution of daily values divided by the annual mean is shown to maintain the same lognormal form with a constant variance. This study is another important step towards the development of a physics-based, long-term climatology of space weather conditions.
Key words: magnetosphere / space environment / interplanetary medium / historical records / energy deposition
© M. Lockwood et al., Published by EDP Sciences 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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