Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..660w&link_type=abstract
Astrophysical Journal, Part 1, vol. 264, Jan. 15, 1983, p. 660-666.
Astronomy and Astrophysics
Astrophysics
16
Interferometry, Millimeter Waves, Solar Limb, Solar Radio Emission, Brightness Temperature, Limb Darkening, Photosphere
Scientific paper
Observations of the solar limb at 2.6mm have been obtained which provide a 6-arcsec FWHM resolution one-dimensional synthesized beam that suffices for the resolution of the spicule forest's contribution, when it is seen edge-on at the solar limb. The data are analyzed by (1) direct interpretation of the simple dependence of observed amplitudes and phases on spatial frequency; (2) performing one-dimensional aperture synthesis; and (3) fitting the observed amplitudes and phases to assumed limb profiles by least-squares fitting. In each case, the observations showed limb darkening at the extreme limb, with no evidence for a limb spike. The solar radius at 2.6 mm is found to be 8 to 12 arcsec larger than the photospheric radius, and the width of the limb, at 1.3 arcsec, is significantly sharper than expected on the basis of optical data.
Hurford Gordon J.
Seielstad George A.
Wannier Peter G.
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