Meteoritic evidence for the Maunder minimum in solar activity

Details Meteoritic evidence for the Maunder minimum in solar activity Meteoritic evidence for the Maunder minimum in solar activity

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..219f&link_type=abstract

Geophysical Research Letters, vol. 5, Mar. 1978, p. 219-222.

Physics

Cosmic Rays, Interplanetary Medium, Solar Activity Effects, Solar Terrestrial Interactions, Sunspot Cycle, Argon Isotopes, Carbon 14, Radioactive Age Determination, Solar Activity

Scientific paper

Concentrations of argon-39 produced by cosmic rays in the metal in 30 meteorites are remarkably similar, but they are slightly higher than expected for the present solar-cycle-averaged flux of cosmic rays. This supports the idea suggested by Eddy (1976) that there were prolonged minima in solar activity before 1715 which caused the deVries maximum in carbon-14 in earth's atmosphere by reducing the amount of cosmic-ray modulation in interplanetary space. The observations are easily consistent with 180 years of 'sunspot minimum' modulation during the Maunder and Spoerer minima, and possibly with virtually no solar modulation at all during that time. This would indicate that the solar wind then contained very little magnetic turbulence or whatever it is in the solar wind that causes the modulation of galactic cosmic rays.

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