Physics
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...50..465s&link_type=abstract
Solar Physics, vol. 50, Nov.-Dec. 1976, p. 465-480.
Physics
10
Crab Nebula, Faraday Effect, Polarized Electromagnetic Radiation, Radio Waves, Solar Corona, Electron Density (Concentration), Solar Magnetic Field, Solar X-Rays, Standard Deviation
Scientific paper
Results are reported for observations of Faraday rotation of linearly polarized 4170-MHz radio waves from the Crab Nebula during occulations of that nebula by the solar corona in June of 1971, 1973, 1974, and 1975. The intrinsic position angle of polarization at 4170 MHz is determined to be about 142 deg, and the degree of polarization is estimated to be approximately 4.7%. It is found that the position angle varied around its intrinsic value by 20 to 50 deg on days when the nebula most closely approached the sun and that the position-angle variation became smaller as the years proceeded, suggesting that the Faraday effect depends on solar-cycle phase. The results are compared with those obtained from observations of coronal magnetic fields and X-ray coronal holes. The comparison indicates that the rotation of the polarization plane is enhanced when the line of sight to the nebula passes across radial extensions of strong magnetic fields associated with helmetlike streamers but is suppressed when the line of sight passes through large coronal holes.
Kawabata Kiyoshi
Kawajiri N.
Sofue Yoshiaki
Takahashi Fuminobu
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