North-South asymmetry of the daily interplanetary magnetic field spiral during the period: 1965–1990 |
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Authors: | I Sabbah |
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Institution: | (1) Department of Physics, Faculty of Science, University of Alexandria, Alexandria, Egypt |
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Abstract: | We have extended our earlier study of the dependance of interplanetary magnetic field (IMF) spiral on the magnetic polarity to cover the 26-year period 1965–1990. Our analysis reveals that: 1. The spiral angle north of the current sheet is higher than south of it. 2. During both of negative solar polarity epochs the IMF spiral is stable; it shows more variation during positive polarity epoch. 3. The included angle is lower than 180° during negative polarity epochs and higher than 180° during positive polarity epoch. 4. The Earth spent more time north of the current sheet during our period of analysis. |
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