Submillimeter extensions of the solar limb determined from observations of the total eclipse of 1981 July 31

Physics

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Solar Eclipses, Solar Limb, Submillimeter Waves, C-141 Aircraft, Chromosphere, Fine Structure, Infrared Radiation, Light (Visible Radiation)

Scientific paper

First results are presented of observations of a lunar occultation of the solar limb made from the Kuiper Airborne Observatory in the 30 micrometr, 50 micrometer, 100 micrometer, and 200 micrometer continuum during the total solar eclipse of 1981 July 31. The solar limb was extended at the longer wavelengths up to 1000 km higher than predicted from smooth plane-parallel chromospheric models. Results at both second and third contact show the infrared limb extensions to be approximately 0".8, 1"5, 2".5 and 3".0 above the visible limb in the observed bands, respectively. A possible interpretation proposes chromospheric fine structure inhomogeneities of greater density than presently incorporated in models of the middle chromosphere.

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