Physics
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1212b&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 108, Issue A5, pp. SSH 10-1, CiteID 1212, DOI 10.1029/2002JA009553
Physics
Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Solar Cycle Variations (7536), Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Interplanetary Physics: Solar Wind Plasma
Scientific paper
The present work focuses on the annual/semiannual behavior of those parameters which can be considered to be the most relevant factors from the point of view of geoeffectiveness. These are the interplanetary magnetic field (IMF) components, Bz and By (in both the Geocentric Solar Magnetospheric (GSM) system and Geocentric Solar Ecliptic (GSE) system), the bulk speed of the plasma, and the number of hours spent by the Earth in domains of either positive or negative GSM By. In all cases, monthly mean values were used. As a criterion of geoeffectiveness, we adopted the values Kp > 3. The consecutive solar dipole cycles were separately studied, and definite differences were found between the annual variations of the mean values. When the solar dipole is opposite to the terrestrial one, the mean Bz does not exhibit the Russell-McPherron effect in the GSM system because there are strong inverse annual variations in the GSE system. However, the Russell-McPherron effect can be detected in the occurrence of the negative and positive GSM By values. The case is opposite in those years when the solar and terrestrial dipoles are parallel: the Russell-McPherron effect is detectable in the opposite annual variations of the mean GSM Bz but not in the occurrence of GSM By values. The mean bulk speed of geoeffective events also shows a dipole cycle dependence in its average value, and it shows a semiannual character in the parallel years.
Baranyi Tunde
Ludmány András
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