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High resolution polarimetry of the Sun at 3. 7 and 11. 1 cm wavelengths. [Stokes parameters, polarization]

Journal Article:

Abstract

The four Stokes parameters are presented for interferometric observations of the Sun at wavelengths of lambda=3.7 cm and lambda=11 cm with angular resolutions between 2.7 and 36.7 seconds of arc. An H..cap alpha.. solar flare of importance SN and type C has a radio wavelength (lambda=3.7 cm) size of 5 seconds of arc, a flux density of 0.3 x 10/sup -22/Wm/sup -2/Hz/sup -1/, and a brightness temperature on the order of 10/sup 7/K. The radio flare is 30% left circularly polarized at lambda=3.7 cm, 70% left circularly polarized at lambda=11 cm, and no detectable linear polarization was observed at either wavelength. During a forty hour observation of sunspot region McMath No 13926 no substantial variations in circular polarization were observed, whereas one hour prior to the eruption of a solar flare dramatic changes in circular polarization were observed. Small scale features whose angular sizes are on the order of five seconds of arc exhibit changes of circular polarization of up to 80%. At times other than those immediately preceding flare emission, the degree of circular polarization was the same as the two wavelengths but the sign was reversed. This situation can be explained if magnetic fields of intensity H<=1000 G  More>>
Authors:
Lang, K R [1] 
  1. Tufts Univ., Medford, Mass. (USA). Dept. of Physics
Publication Date:
Apr 01, 1977
Product Type:
Journal Article
Reference Number:
AIX-08-342001; EDB-78-040149
Resource Relation:
Journal Name: Sol. Phys.; (Netherlands); Journal Volume: 52:1
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; SOLAR FLARES; FLUX DENSITY; RADIOWAVE RADIATION; SUN; INTERFEROMETRY; BALMER LINES; BRIGHTNESS; ELECTRON DENSITY; MAGNETIC FIELDS; POLARIZATION; SOLAR RADIATION; STOKES PARAMETERS; ELECTROMAGNETIC RADIATION; OPTICAL PROPERTIES; PHYSICAL PROPERTIES; RADIATIONS; SOLAR ACTIVITY; STARS; 640104* - Astrophysics & Cosmology- Solar Phenomena; 640103 - Astrophysics & Cosmology- Quasi-Stellar, Radio, & X-Ray Sources- (-1987)
OSTI ID:
5331491
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: SLPHA
Submitting Site:
INIS
Size:
Pages: 63-68
Announcement Date:

Journal Article:

Citation Formats

Lang, K R. High resolution polarimetry of the Sun at 3. 7 and 11. 1 cm wavelengths. [Stokes parameters, polarization]. Netherlands: N. p., 1977. Web.
Lang, K R. High resolution polarimetry of the Sun at 3. 7 and 11. 1 cm wavelengths. [Stokes parameters, polarization]. Netherlands.
Lang, K R. 1977. "High resolution polarimetry of the Sun at 3. 7 and 11. 1 cm wavelengths. [Stokes parameters, polarization]." Netherlands.
@misc{etde_5331491,
title = {High resolution polarimetry of the Sun at 3. 7 and 11. 1 cm wavelengths. [Stokes parameters, polarization]}
author = {Lang, K R}
abstractNote = {The four Stokes parameters are presented for interferometric observations of the Sun at wavelengths of lambda=3.7 cm and lambda=11 cm with angular resolutions between 2.7 and 36.7 seconds of arc. An H..cap alpha.. solar flare of importance SN and type C has a radio wavelength (lambda=3.7 cm) size of 5 seconds of arc, a flux density of 0.3 x 10/sup -22/Wm/sup -2/Hz/sup -1/, and a brightness temperature on the order of 10/sup 7/K. The radio flare is 30% left circularly polarized at lambda=3.7 cm, 70% left circularly polarized at lambda=11 cm, and no detectable linear polarization was observed at either wavelength. During a forty hour observation of sunspot region McMath No 13926 no substantial variations in circular polarization were observed, whereas one hour prior to the eruption of a solar flare dramatic changes in circular polarization were observed. Small scale features whose angular sizes are on the order of five seconds of arc exhibit changes of circular polarization of up to 80%. At times other than those immediately preceding flare emission, the degree of circular polarization was the same as the two wavelengths but the sign was reversed. This situation can be explained if magnetic fields of intensity H<=1000 G and electron densities of Nsub(e)>=10/sup 7/cm/sup -3/ are present.}
journal = {Sol. Phys.; (Netherlands)}
volume = {52:1}
journal type = {AC}
place = {Netherlands}
year = {1977}
month = {Apr}
}