Polarization effects in RATAN-600 solar observations in the “Southern sector with a flat reflector” mode

We report the results of numerical simulations of the instrumental signal in the Stokes V channel of circular polarization as observed by RATAN-600 radio telescope operating in the “Southern sector with a flat reflector” mode. Our simulations are based on an improved algorithm of the beam pattern co...

Full description

Saved in:
Bibliographic Details
Published in:Astrophysical bulletin 2012, Vol.67 (1), p.90-114
Main Authors: Opeikina, L. V., Majorova, E. K., Korzhavin, A. N.
Format: Article
Language:English
Subjects:
Algorithms
Antennas
Astronomy
Astrophysics and Cosmology
Channels
Computation
Computer simulation
Mathematical models
Physics
Physics and Astronomy
Reflectors
Space telescopes
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report the results of numerical simulations of the instrumental signal in the Stokes V channel of circular polarization as observed by RATAN-600 radio telescope operating in the “Southern sector with a flat reflector” mode. Our simulations are based on an improved algorithm of the beam pattern computation that takes into account diffraction in the space between the telescope mirrors. The computations cover a wide range of wavelengths in the case of a focused antenna and in the presence of aberrations. We analyze the structure and properties of the element M 41 of the Mueller matrix and of the parasite signal from the solar disk in various cases of the antenna irradiation. We estimate the differences between the left- and right-polarization power-beam patterns of the telescope. We report the computed M 11 and M 41 elements for the case of observation of the right- and left-polarized radiation at different points of the focal line of the secondary mirror, and analyze their variations as a function of a number of parameters, including, in particular, the shift applied to correct the displacement of scans.
ISSN:1990-3413
1990-3421
DOI:10.1134/S1990341312010099