Physics
Scientific paper
Aug 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996soph..167..409v&link_type=abstract
Solar Physics, Volume 167, Issue 1-2, pp. 409-417
Physics
38
Scientific paper
Using the maximum entropy method (MEM), the cosmic-ray power spectral density in the frequency range 3 × 10-9 2 × 10-7 Hz has been estimated for the period 1947 1990. Cosmic-ray intensity data were integrated from the ion chamber at Huancayo and the neutron monitor at Deep River, following the method of Nagashima and Morishita (1980). The estimated spectrum shows power-law dependence (f -1.62), with several peaks superimposed. Periodicities of the different peaks are identified and related to solar activity phenomena; most of them were reported in the past. Once the 11-yr variation is eliminated, the most prominent feature in the spectrum is a variation, not reported before, with a period of 1.68 yr (604.8 d). This peak is correlated with fluctuations of similar periodicities found in the southern coronal hole area and in large active regions. The importance that this variation may have to elucidate the solar magnetic flux emergence and the activity cycle is discussed.
Otaola J. A.
Perez-Enriquez Roman
Valdés-Galicia Francisco J.
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