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Near-Earth heliospheric magnetic field intensity since 1750. Part 1: sunspot and geomagnetic reconstructions

Owens, M. J., Cliver, E., McCracken, K. G., Beer, J., Barnard, L., Lockwood, M., Rouillard, A., Passos, D., Riley, P., Usoskin, I. and Wang, Y.-M. (2016) Near-Earth heliospheric magnetic field intensity since 1750. Part 1: sunspot and geomagnetic reconstructions. Journal of Geophysical Research: Space Physics, 121 (7). pp. 6048-6063. ISSN 2169-9402

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To link to this item DOI: 10.1002/2016JA022529

Abstract/Summary

We present two separate time series of the near-Earth heliospheric magnetic field strength (B) based on geomagnetic data and sunspot number (SSN). The geomagnetic-based B series from 1845-2013 is a weighted composite of two series that employ the interdiurnal variability index; this series is highly correlated with in situ spacecraft measurements of B (correlation coefficient, r = 0.94; mean square error, MSE = 0.16 nT2). The SSN-based estimate of B, from 1750-2013, is a weighted composite of eight time series derived from two separate reconstruction methods applied to four different SSN time series, allowing determination of the uncertainty from both the underlying sunspot records and the B-reconstruction methods. The SSN-based composite is highly correlated with direct spacecraft measurements of B and with the composite geomagnetic B time series from 1845-2013 (r = 0.91; MSE = 0.24 nT2), demonstrating that B can accurately reconstructed by both geomagnetic and sunspot-based methods. The composite sunspot and geomagnetic B time series, with uncertainties, are provided as supplementary electronic material.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:65901
Publisher:American Geophysical Union

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