An investigation of the linear polarization in emission features of active regions

Physics

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H Alpha Line, H Beta Line, Linear Polarization, Solar Activity, Solar Spectra, Emission Spectra, Solar Flares, Stokes Law Of Radiation

Scientific paper

A study has been made of linear polarization in 'moustaches' using the H-alpha and H-beta lines. A Wollaston prism and an achromatic lambda 2-plate were employed in the study. In the course of the observations, the major axis of the plate was placed at 0 deg and 22.5 deg with respect to the horizontal axis of the installation. The Stokes parameters J, Q, and U were recorded, thus enabling the degree of polarization and the field azimuth to be determined. During the first three minutes of the existence of the moustaches, the two lines revealed a linear polarization of about 7 percent located at the center of the lines. No polarization was found during the later stage of the moustaches lifetimes. Whenever the linear polarization is present, there is a tendency for the polarization to decrease rapidly, in accompaniment of a turning of the azimuth. Several mechanisms for interpreting the polarization observed in the moustaches are examined. Some suggestions are made in support of the excitaton of hydrogen moustaches initiated by a high-energy electron flux or vertical heat conduction.

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