
doi: 10.1007/bf00113989
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.
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