NASA NTRS · 19720058758
Change in the eleven-year modulation at the time of the June 8, 1969, Forbush decrease.
Abstract
The functional form of the modulation for the 11-year variation changed abruptly after the Forbush decrease of June 8, 1969. This change in the 11-year modulation suggests that this Forbush decrease was an integral part of the 11-year variation. Some details of the change as observed by neutron monitors and by spacecraft at low energies are discussed.
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Lockwood, J. A., Lezniak, J. A., Webber, W. R.. 1972-09-01. Change in the eleven-year modulation at the time of the June 8, 1969, Forbush decrease.. https://ntrs.nasa.gov/citations/19720058758
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