Physics
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..248h&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 4, p. 248-253.
Physics
18
Geomagnetism, Solar Activity Effects, Solar Cycles, Solar Terrestrial Interactions, Magnetic Disturbances, Periodic Variations, Solar Wind, Time Series Analysis
Scientific paper
Solar cycle variations in the 27-day recurrence of geomagnetic activity during cycles 17-21 are examined using an event analysis technique rather than the usual approach of time series analysis. The 'events' were recurrent storm days. The observed numbers of events are compared against those expected from chance coincidence using the well-known chi-squared statistic. Thus it is straightforward to assess the statistical significance of any changes in the rates of occurrence of events. This analysis shows that there were significant peaks in the rate of occurrence of 27-day activity in the second half of the declining phase of each cycle. This peak was much larger for the two even-numbered cycles than for the three odd-numbered cycles. Thus we may conclude that the solar cycle modulation in the 27-day activity was more marked in the even-numbered cycles than in the odd. This evidence suggests that there is a double solar cycle in 27-day activity. It is shown that this result is consistent with in situ observations of corotating streams for cycles 20 and 21.
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