Physics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9317631b&link_type=abstract
Unknown
Physics
Geomagnetism, Solar Activity Effects, Solar Terrestrial Interactions, Solar Wind, Long Term Effects, Magnetic Disturbances, Solar Corona, Transient Response
Scientific paper
The long term features in solar-terrestrial relations from 1868 to 1988 were studied by means of correlative analyses between monthly values of the aa index and Rz numbers. The role of each type of solar wind sources is underlined in connection with the different sunspot cycle phases. It is suggested that in general the solar transient activity dominates the ascending phases, while coronal hole features dominate the descending ones. The geomagnetic response to transient and corotating interplanetary disturbances seems to be the origin of such behavior, provided that the considered aa set be used as proxy data for solar wind features in the near Earth environment. An interplay between sunspot heliographic positions and polar coronal hole extensions towards the equator exists, as it comes out from the analysis of the sunspot cycle N.19.
Borello Filisetti Ottavia
Mussino Vittorio
Parisi Mario
Storini Marisa
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