High-sensitivity circular polarimetry of the Sun, 0.5 - 1.7 microns

Details High-sensitivity circular polarimetry of the Sun, 0.5 - 1.7 microns High-sensitivity circular polarimetry of the Sun, 0.5 - 1.7 microns

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982saosr.392a.191k&link_type=abstract

In Smithsonian Astrophysics Observatory 2nd Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, Vol. 1 p 191-197 (

Physics

Magnetic Fields, Photoelasticity, Polarimetry, Solar Physics, Statistical Analysis, Sunspots, Broadband, Correlation, Line Spectra, Optical Properties, Sensitivity, Telescopes

Scientific paper

Using an isometric (symmetrical) photoelastic-modulator polarimeter and a Cassegrain telescope, broadband polarization measures of the Sun were obtained with unprecedented sensitivity. With an instrumental background of x 10 to the minus 6th power differential effects delta q = V/I of 1 x 10 to the minus 7th power were detectable. Some results: (1) the lambda dependence of broadband circular polarization in spots was observed out to 1.7 mu, extending the visible-light measurements of Illing, Landman, and Mickey. The q drops to of the order of 1 x 10 to the minus 5 power at 1.2 mu (in a strong spot), then rises at 1.6 mu. While molecules or other special mechanisms must play a role in the visible-light polarization, at lambda 1.5 mu the q values seem consistent with gray magneto-opacity. (2) By surveying inactive regions upper limits are set to broadband polarization due to global or deep-seated magnetic fields. For a double-toroidal pattern a differential measure is found, qb = (qne + qsw - qnw - q- se) 14, at 1.7 mu, of (+1.2 + or = 0.7) x 10 to the minus 7th power a mean from three series in 1981. Based on a simple estimate by L. Biermann this would correspond to deep-down toroidal fields of or approx 2000 gauss. Extension of this work are discussed.

Affiliated with

Also associated with

No associations

Rating

High-sensitivity circular polarimetry of the Sun, 0.5 - 1.7 microns does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with High-sensitivity circular polarimetry of the Sun, 0.5 - 1.7 microns, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-sensitivity circular polarimetry of the Sun, 0.5 - 1.7 microns will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1648399