Long-term variation of the solar wind stream pattern in the declining portion of solar activity

Details Long-term variation of the solar wind stream pattern in the declining portion of solar activity Long-term variation of the solar wind stream pattern in the declining portion of solar activity

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37..297n&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 37, March 1989, p. 297-310.

Computer Science

2

Solar Activity, Solar Terrestrial Interactions, Solar Wind, Twenty-Seven Day Variation, Coronal Holes, Geomagnetism, Solar Cycles, Sunspot Cycle

Scientific paper

Long-term changes of the 27 day variation of the geomagnetic disturbances were investigated to study the solar cycle dependence of the solar wind stream pattern. Harmonic analysis was performed for each declining portion from solar cycle 11 to 21. The amplitude of the first harmonic component exhibits the semiannual enhancement in the declining portion of the even cycles. The second harmonic component exhibits quasi-constancy in the phase in the declining portion of the solar cycle 12, 16 and 20 but not in the solar cycle 14 and 18. In the odd cycles, there is no systematic feature in the first and second components.

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