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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 12, issue 4
Ann. Geophys., 12, 279–285, 1994
https://doi.org/10.1007/s00585-994-0279-x
© European Geosciences Union 1994
Ann. Geophys., 12, 279–285, 1994
https://doi.org/10.1007/s00585-994-0279-x
© European Geosciences Union 1994

  31 Mar 1994

31 Mar 1994

A search for north-south asymmetry of interplanetary magnetic field and solar plasma

I. Sabbah I. Sabbah

Abstract. An analysis of interplanetary magnetic field (IMF) and plasma data taken near 1 AU during solar activity cycle 21 reveals the following. 1. The yearly averaged spiral angle shows a solar cycle dependence. 2. The spiral angle north of the current sheet is 2.4° higher than south of it during both epochs of positive and negative polarities. 3. The included angle is 4.8° higher during the epoch of positive polarity than during the epoch of negative polarity. 4. The asymmetries in the number of away and toward IMF days are correlated with the asymmetries in solar activity. 5. The solar plasma north of the current sheet is hotter, faster and less dense than south of it during the epoch of negative polarity. 6. An asymmetry in the averaged filed magnitude is absent for solar cycle 21.

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