Computer Science
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977stin...7829027d&link_type=abstract
Unknown
Computer Science
Photosphere, Solar Magnetic Field, Solar Rotation, Solar Velocity, Electric Current, Magnetic Signatures, Solar Cycles
Scientific paper
Magnetograms are used to derive the average poloidal and toroidal components of the photospheric magnetic field near solar minimum as a function of the poloidal field near the poles is found to have the dipolar structure characteristic of solar minimum with a positive field in the north and negative field in the south, both with a measured strength of approximately 1 gauss. At lower latitudes the poloidal field has the same polarity as the pole in that hemisphere but the field strength has the reduced magnitude of approximately 0.1 gauss. A toroidal field of broad latitude extent is found to have opposite sense in the two solar hemispheres and a magnitude of approximately 0.1 gauss. The sense of the toroidal field is the same as that of the assumed subsurface toroidal field giving rise to active regions solar cycle 21. The toroidal field is used to derive the electric current crossing the photosphere in conjunction with the magnetogram observations, an accurate determination of the relative wavelength shift of the spectral line is made for each position on the solar disk. The solar rotation, the limb effect on the disk and the possibility of a mean meridional circulation in the photosphere are studied.
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