Physics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988em%26p...41..279x&link_type=abstract
Earth, Moon, and Planets (ISSN 0167-9295), vol. 41, June 1988, p. 279-288.
Physics
Frequency Distribution, Interplanetary Magnetic Fields, Interplanetary Medium, Solar Activity, Accuracy, Annual Variations, Power Spectra
Scientific paper
The analysis of the mean frequency of occurrence of the sector boundaries of the interplanetary magnetic field within successive Bartels rotations have revealed sporadic periodicities of 14 and 28 Bartels rotations which correspond to yearly and biennial variations. In addition, the differences of the five moving average time series of the sector boundary occurrences from the mean frequency sector boundary occurrences show significant periodicities of 6 and 4 Bartels rotations. It is pointed out that an analytical expression which contains periodic terms of 28, 14, 6, and 4 Bartels rotations can approximate in a high accuracy level the observed values of the mean frequency of the sector boundary occurrences.
Tritakis Vasilis
Xanthakis John
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