NASA NTRS · 19850026748
Spectral analysis of the Forbush decrease of 13 July 1982
Abstract
The maximum entropy method has been applied in the spectral analysis of high-energy cosmic-ray intensity during the large Forbush event of July 13, 1982. An oscillation with period of about 2 hours and amplitude of 1 to 3% was found to be present during the decrease phase. This oscillation can be related to a similar periodicity in the magnetospheric field. However, the variation was not observed at all neutron monitor stations. In the beginning of the recovery phase, the intensity oscillated with a period of about 10 hours and amplitude of 3%.
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Vainikka, E., Torsti, J. J., Valtonen, E., Lumme, M., Nieminen, M., Peltonen, J., Arvela, H.. 1985-08-01. Spectral analysis of the Forbush decrease of 13 July 1982. https://ntrs.nasa.gov/citations/19850026748
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