The 3.3-mm brightness distribution of the quiet sun |
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| Authors: | F I Shimabukuro |
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| Institution: | (1) The Aerospace Corporation, El Segundo, Calif., U.S.A. |
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| Abstract: | Center-to-limb brightness distribution measurements of the quiet Sun at a wavelength of 3.3 mm show that there is a slight
limb brightening at this wavelength. Within the measurement accuracy of the system used, the limb brightening function is
only radially dependent. At 3.3 mm, the measurements are consistent with a solar brightness curve that is flat to about r = 0.8 with a rapid increase to a peak value of about 1.3 at the limb. The results show that most of the central disk 3.3-mm
emission comes from a thin layer of relatively constant temperature about 1500–3500 km above the photosphere.
This work was supported by the U.S. Air Force under Contract No. F04701-69-C-0066. |
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