On Polarimetric and Color Observations of the Inner K-corona

Details On Polarimetric and Color Observations of the Inner K-corona On Polarimetric and Color Observations of the Inner K-corona

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.3.66k&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

Not a single current space project is devoted to the most inner K-corona (< 1.4 solar radii), which is the single manifestation of coronal electrons in optics. The high-precision visual continuum polarimetry (1% for linear polarization degree and 1 deg for orientation of polarization plane) could give knowledge on tangential and radial electron velocity fields. Quasi-space totality sky brightness and the use of the low-scattered light feeding optics result in significantly improved the "signal-to-noise" ratio for the I, U, and Q-Stokes recording. Our recent total solar eclipse broad-band RGB linear polarization and color data are used to show the feasibility for future space researches aimed at electron velocity field in the most inner range. The 2D distributions of the linear polarization degree and the polarization direction are interpreted in the frame of scattering the photosphere radiation at moving electrons in non-relativistic approximation. A conclusion on observational evidences for different scale electrical currents is made. Opportunity to search for radial velocity field of coronal electrons is tested by measuring the so-called relative color index. The 2D distributions of the relative "color index" for the March 29, 2008 corona evidently reveal different color for different coronal structures, bluing effect in the most inner regions and reddening with distance. Interpretation in the frame of Doppler effect is suggested for non-relativistic approximation. Researches are supported by the grant # 08-02-00975 of RFBR.

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