Poleward migration of the magnetic neutral line and the reversal of the polar fields on the Sun |
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Authors: | V I Makarov K R Sivaraman |
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Institution: | (1) The Kislovodsk Station of the Pulkovo Observatory, 357741 Kislovodsk, U.S.S.R.;(2) Indian Institute of Astrophysics, 560 034 Bangalore, India |
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Abstract: | Poleward migration of the magnetic neutral line on the Sun has been calculated for the periods 1945–1950 and 1955–1981 using synoptic charts based on H observations. Epochs of sign reversal of the solar magnetic field at latitudes 50° to 90° have been determined for these periods. During the cycles 19 and 20 a threefold sign reversal took place in the northern hemisphere. During all the above cycles both the solar poles were of one polarity for a period ranging from 0.5 to 1 year. The poleward drift velocity of the magnetic neutral line varies from 6 to 29 m s–1 and seems to depend on the strength of the cycle. |
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