Abstract
view Abstract Citations (21) References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Interferometric observations of solar limb structure at 2.6 millimeters Wannier, P. G. ; Hurford, G. J. ; Seielstad, G. A. Abstract 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. Publication: The Astrophysical Journal Pub Date: January 1983 DOI: 10.1086/160639 Bibcode: 1983ApJ...264..660W Keywords: Interferometry; Millimeter Waves; Solar Limb; Solar Radio Emission; Brightness Temperature; Limb Darkening; Photosphere; Solar Physics full text sources ADS |
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