Near-Earth heliospheric magnetic field intensity since 1750: 2. Cosmogenic radionuclide reconstructions - Archive ouverte HAL Access content directly
Journal Articles Journal of Geophysical Research: Space Physics Year : 2016

Near-Earth heliospheric magnetic field intensity since 1750: 2. Cosmogenic radionuclide reconstructions

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1
M. J. Owens
  • Function : Author
E. Cliver
  • Function : Author
K. G. Mccracken
  • Function : Author
J. Beer
  • Function : Author
L. Barnard
  • Function : Author
M. Lockwood
  • Function : Author
D. Passos
  • Function : Author
P. Riley
  • Function : Author
I. Usoskin
  • Function : Author
Y. -M. Wang
  • Function : Author

Abstract

This is Part 2 of a study of the near-Earth heliospheric magnetic field strength, B, since 1750. Part 1 produced composite estimates of B from geomagnetic and sunspot data over the period 1750-2013. Sunspot-based reconstructions can be extended back to 1610, but the paleocosmic ray (PCR) record is the only data set capable of providing a record of solar activity on millennial timescales. The process for converting 10Be concentrations measured in ice cores to B is more complex than with geomagnetic and sunspot data, and the uncertainties in B derived from cosmogenic nuclides (~20% for any individual year) are much larger. Within this level of uncertainty, we find reasonable overall agreement between PCR-based B and the geomagnetic- and sunspot number-based series. This agreement was enhanced by excising low values in PCR-based B attributed to high-energy solar proton events. Other discordant intervals, with as yet unspecified causes remain included in our analysis. Comparison of 3 year averages centered on sunspot minimum yields reasonable agreement between the three estimates, providing a means to investigate the long-term changes in the heliospheric magnetic field into the past even without a means to remove solar proton events from the records.
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insu-03669464 , version 1 (17-05-2022)

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M. J. Owens, E. Cliver, K. G. Mccracken, J. Beer, L. Barnard, et al.. Near-Earth heliospheric magnetic field intensity since 1750: 2. Cosmogenic radionuclide reconstructions. Journal of Geophysical Research: Space Physics, 2016, 121, pp.6064-6074. ⟨10.1002/2016JA022550⟩. ⟨insu-03669464⟩
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