Measurement of the solar limb brightness profile at 3 millimeters during the total eclipse of 1991 July 11
1992; IOP Publishing; Volume: 400; Linguagem: Inglês
10.1086/172031
ISSN1538-4357
AutoresLeila Belkora, G. J. Hurford, Dale E. Gary, D. P. Woody,
Tópico(s)Solar Radiation and Photovoltaics
Resumoview Abstract Citations (26) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Measurement of the Solar Limb Brightness Profile at 3 Millimeters during the Total Eclipse of 1991 July 11 Belkora, L. ; Hurford, G. J. ; Gary, Dale E. ; Woody, D. P. Abstract Observations of the solar limb at the point of first contact during the eclipse of 1991 July 11, with a spatial resolution of about 1.6 arcsec, are reported. The visibility amplitude and phase were modeled to yield the height of the 3-mm limb above the visible photosphere, and the data were differentiated to yield the brightness profile of the limb in strips about 1.6 arcsec wide. The 3-mm limb was found to extend 7.5 +/- 0.8 arcsec above the visible photosphere, with no evidence of a limb spike. The 3-mm limb, at a temperature of about 6500 K, extends to altitudes far beyond the expected location of the transition region in the model of Vernazza et al. (1981). A comparison of the 3-mm profile and an off-band H-alpha photograph of the limb reveals a close correspondence between the 3-mm limb and the height of H-alpha spicules. Publication: The Astrophysical Journal Pub Date: December 1992 DOI: 10.1086/172031 Bibcode: 1992ApJ...400..692B Keywords: Brightness Distribution; Brightness Temperature; Solar Eclipses; Solar Limb; Millimeter Waves; Radio Astronomy; Solar Physics; ECLIPSES; SUN: RADIO RADIATION full text sources ADS |
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