The large-scale solar magnetic field

Details The large-scale solar magnetic field The large-scale solar magnetic field

Nov 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974soph...39....3a&link_type=abstract

Solar Physics, vol. 39, Nov. 1974, p. 3-17.

Physics

29

Harmonic Analysis, Photosphere, Solar Magnetic Field, Spherical Harmonics, Magnetic Dipoles, Solar Cycles, Solar Flares, Time Response

Scientific paper

A spherical harmonic expansion was used as a tool to describe succinctly the complex patterns of the large-scale photospheric magnetic field for the years 1959 through 1972. Most often the harmonic pattern of the photospheric magnetic field is a simple east-west dipole or 2-sector structure. There was also a significant zonal harmonic in which both solar poles had the same magnetic polarity, opposite to that at the equator. At the end of 1962 and lasting through 1964, a sector structure with four sectors often became the dominant harmonic. In 1965 and 1966, in the postminimum part of the solar cycle, the north-south dipole component became significant. From the end of 1967 to 1970, the equatorial dipole component was most often the dominant harmonic. The harmonic analysis of 1969 through 1972 looks very similar to that of the years 1959 to 1962, a solar cycle earlier. Rapid changes in the global harmonics suggest either that the global field is not very deep or that very strong fluid flows couple the photosphere with deeper layers.

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