Physics
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3112808e&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 12, CiteID L12808
Physics
6
Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Solar Cycle Variations (7536), Magnetospheric Physics: Solar Wind/Magnetosphere Interactions
Scientific paper
Interplanetary magnetic field (IMF) polarity data for the years 1927-2002 were studied by wavelet analysis technique, which permits the identification of non-steady features in the IMF polarity data. It was found that the annual variation in the IMF polarity (the Rosenberg-Coleman effect) is present only during the rise phase of solar cycles. This result is confirmed by the observed Bx (radial) solar wind measurements since 1964. This asymmetry could be caused by a more stable and flat heliospheric current sheet being present only in the rise phase of solar cycles, with co-rotating high speed streams disturbing it during the descending phases. This finding bears on the generally accepted explanation of the 22-year geomagnetic activity cycle.
Echer Ezequiel
Svalgaard Leif
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