Abstract
Observations of the intensity distribution near the solar limb at 2.43 and 22.5 μ, show the absence of limb brightening to within 1 or 2 arc sec of the limb. Observations at 1.2 mm indicate limb brightening at this wavelength. These results are compared with the Utrecht Reference Photosphere and with existing data on the solar flux in the millimeter range, and suggest that the temperature minimum is broad and extends above τ5000 = 2 × 10−3. A sharp rise of temperature is required above τ5000 = 10−5.
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© 1968 D. Reidel Publishing Company, Dordrecht, Holland
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Noyes, R.W., Beckers, J.M., Low, F.J. (1968). Observational Studies of the Solar Intensity Profile in the Far Infrared and Millimeter Regions. In: de Jager, C. (eds) The Structure of the Quiet Photosphere and the Low Chromosphere. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-3470-8_4
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DOI: https://doi.org/10.1007/978-94-010-3470-8_4
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