The mean magnetic field of the Sun: Observations at Stanford
A solar telescope has been built at Stanford University to study the organization and evolution of large-scale solar magnetic fields and velocities. The observations are made using a Babcock-type magnetograph which is connected to a 22.9 m vertical Littrow spectrograph. Sun-as-a-star integrated light measurements of the mean solar magnetic field have been made daily since May 1975. The typical mean field magnitude has been about 0.15 G with typical measurement error less than 0.05 G. The mean field polarity pattern is essentially identical to the interplanetary magnetic field sector structure (see near the Earth with a 4 day lag). The differences in the observed structures can be understood in terms of a ‘warped current sheet’ model.
KeywordsMagnetic Field Current Sheet Interplanetary Magnetic Field Field Polarity Typical Measurement
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- Beckers, J. M.: 1968, Solar Phys. 5, 15.Google Scholar
- Howard, R.: 1974, Solar Phys. 38, 283.Google Scholar
- Howard, R., Tanenbaum, A. S., and Wilcox, J. M.: 1968, Solar Phys. 4, 286.Google Scholar
- Scherrer, P. H., Wilcox, J. M., Kotov, V. A., Severny, A. B., and Howard, R.: 1977, Solar Phys. 52, 3.Google Scholar
- Severny, A. B.: 1971, in R. Howard (ed.), ‘Solar Magnetic Fields’, IAU Symp. 43, 675.Google Scholar
- Severny, A. B., Wilcox, J. M., Scherrer, P. H., and Colburn, D. S.: 1970, Solar Phys. 15, 3.Google Scholar
- Svalgaard, L., Wilcox, J. M., Scherrer, P. H., and Howard, R.: 1975, Solar Phys. 45, 83.Google Scholar
- Svalgaard, L. and Wilcox, J. M.: 1976, Nature 262, 766.Google Scholar
- Stix, M.: 1974, Solar Phys. 37, 493.Google Scholar