The Long-Term Variation of the Sun's Magnetic Field

Details The Long-Term Variation of the Sun's Magnetic Field The Long-Term Variation of the Sun's Magnetic Field

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh52a01z&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH52A-01

Physics

2134 Interplanetary Magnetic Fields, 7509 Corona, 7524 Magnetic Fields, 7529 Photosphere

Scientific paper

Measurements of the near-Earth interplanetary magnetic field (IMF) has been examined and it is revealed that the least-squares-fit line of the annual means of the amplitude of the radial IMF component has risen by a factor of 1.4 from 1964 to 1995 (Stamper et al., JGR, 104, 28325, 1999). This changes in the interplanetary magnetic field have been linked with long-term changes in geomagnetic activity and in total cloud cover over the Earth (Lockwood et al., Nature, 399, 437, 1999). Is the changes in the interplanetary magnetic field caused by changes in Sun's magnetic field? We examine the photospheric magnetic field observed by the Wilcox Solar Observatory and the Kitt Peak Solar Observatory over 26 years and find that the change of the total magnetic flux in the photosphere follows closely the change of sunspot number. The coronal magnetic field computed near the Alfven critical point using the three-layer coronal magnetic field model does show a trend of increase from 1976 to the end of 1991, similar to the trend found in the interplanetary magnetic field. However, the trend after 1992 appears to be decreasing. The cause of the discrepancy is discussed.

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