Physics
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975sciam.232..106h&link_type=abstract
Scientific American, vol. 232, Apr. 1975, p. 106-114.
Physics
2
Angular Momentum, Momentum Transfer, Solar Magnetic Field, Solar Rotation, Astronomical Models, Chromosphere, Doppler Effect, Line Spectra, Photosphere, Solar Atmosphere, Solar Oblateness, Solar Physics, Solar Spectra, Solar Wind, Sunspots
Scientific paper
The nonuniform rotation of the sun is discussed. Timing of tracers (such as sunspots) and differential Doppler shifting of spectrographs indicate that the material near the sun's equator rotates faster than the material near its poles. Moreover, rotation of markers, all of which are associated with magnetic fields, is faster than rotation of gas as determined by photospheric spectra; this means that the solar magnetic field rotates faster than the mass of the sun. A rapidly rotating core, as evinced by an observed oblateness greater than that calculated from the sun's observed rotation rate, could explain the differential rotations of mass and field. A transportation of angular momentum from high solar latitudes to low solar latitudes may account for nonuniform mass rotation; several mechanisms for this transfer are considered.
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