Semiannual fluctuation and efficiency factors in sun-weather relations

Details Semiannual fluctuation and efficiency factors in sun-weather relations Semiannual fluctuation and efficiency factors in sun-weather relations

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9714923b&link_type=abstract

Journal of Geophysical Research, Volume 97, Issue A10, p. 14923-14928

Physics

Geophysics

10

Meteorology And Atmospheric Dynamics: Climatology, History Of Geophysics: Solar/Planetary Relationships, Geomagnetism And Paleomagnetism: Time Variations-Diurnal To Secular

Scientific paper

The changing nature of the Sun-weather relations over a 119-year period has been studied by using the geomagnetic aa index. The analysis yields consistent results on several time scales. The most important fluctuation found is a semiannual variation which can be related to the well-known variation of the geomagnetic activity. A threshold value of about aa≃19-20 nT is necessary to detect any solar influence on the weather. The role of the aa index (i.e., corpuscular influences) seems to be determinant in certain cases.

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