The origin of broad-band circular polarization in sunspots

Details The origin of broad-band circular polarization in sunspots The origin of broad-band circular polarization in sunspots

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....64...67a&link_type=abstract

Astronomy and Astrophysics, vol. 64, no. 1-2, Mar. 1978, p. 67-71.

Physics

70

Circular Polarization, Solar Atmosphere, Solar Physics, Sunspots, Broadband, Flow Velocity, Magnetic Flux, Radiative Transfer, Stellar Models, Thermodynamic Equilibrium, Velocity Distribution, Zeeman Effect

Scientific paper

An analysis is performed to demonstrate that the net circular polarization previously discovered in broadband observations of sunspots cannot be explained by either a net continuum polarization or Zeeman line splitting in a static atmosphere. It is shown that a velocity gradient is necessary and sufficient for producing a net circular polarization and that the observations can be explained if macroscopic motions comparable to some unspecified thermal motions are involved. The magnetic-field strength and flow velocities required to explain the cited sunspot observations are estimated.

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