Physics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..668b&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 10, no. 9, p. 668-675.
Physics
9
Geomagnetism, Secular Variations, Solar Activity Effects, Solar Terrestrial Interactions, Coronal Holes, Correlation Coefficients, Sunspot Cycle
Scientific paper
Long-term features in solar-terrestrial relations have been studied for the 1868-1988 time period using correlative analyses between monthly values of the aa indices and Rz numbers. Emphasis is placed on the role of each type of solar wind sources for interplanetary macroperturbations in connection with the different S-cycle phases. It is hypothesized that the solar transient activity dominates the ascending phases, while coronal hole features dominate the descending ones. The r-periodicity for A-phases appears to be shorter than that for the D-phases. It is concluded that the understanding of solar-induced effects on the terrestrial environment necessitates a better knowledge of the physical interplay between coronal holes and sunspots and of their relationship with the heliomagnetic field.
Borello-Filisetti O.
Mussino Vittorio
Parisi Mario
Storini Marisa
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