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Leif Svalgaard   Submitted: 2008-01-15 05:55

McCracken (2007) inverted the galactic cosmic ray record for the interval 1428-2005 to estimate annual averages of the heliomagnetic field (HMF) near Earth during this interval. Quoting from his abstract, ?There is good agreement with the results obtained by others using two independent methodologies based upon the sunspot [Solanki, Sch?ssler, and Fligge, 2002] and geomagnetic [Lockwood, Stamper, and Wild, 1999] records ? There is disagreement with another method based on the geomagnetic record [Svalgaard and Cliver, 2005] that needs to be resolved.? In this comment, we address the reported disagreement of our long-term reconstruction of the HMF strength with that obtained in the other three studies. We show that a recent reconstruction of the HMF by Rouillard, Lockwood, and Finch [2007] agrees much more closely with that of Svalgaard and Cliver than that of Lockwood, Stamper and Wild. We also point out that the Solanki et al. model was developed to reproduce the Lockwood et al. HMF time variation; it does not provide independent support for the Lockwood et al. time series. We suggest that the discrepancy between McCracken?s cosmic-ray-based HMF reconstruction and those based on geomagnetic data originates in the Forbush and Neher ionization chamber data (1933-1957) used to bridge the time gap between the 10Be time series (1428-1930) and the Climax neutron monitor record (1951-present).

Authors: Leif Svalgaard, Edward W. Cliver
Projects: None

Publication Status: Under Review, Journal of Geophysical Research
Last Modified: 2008-01-15 10:16
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