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P. T. Spickler (Bridgewater College), D. C. Benner (College of William and Mary), J. M. Russell, III (Hampton University)
Solar data from the Halogen Occultation Experiment (HALOE) were analyzed to determine umbra to photosphere intensity ratios at eight infrared wavelengths from 2.45 to 10 microns. A nonlinear least squares method was used to analyze HALOE solar data that included information on photospheric relative intensity as well as the relative intensity of sunspots. These data showed the general trend of umbra to photosphere intensity ratios increasing with wavelength, which is not unexpected since this follows the trend reported by Albregtsen, Joras, and Maltby (1984, Solar Physics 90, 17) at shorter wavelengths. For two sunspots, however, the umbra to photosphere intensity ratios increased with wavelength from 2.45 to 3.46 microns and then decreased from 5.26 to 10 microns. The mechanism that causes this behavior is not well understood.
This research was partially supported by a grant from NASA administered by the American Astronomical Society.
The author(s) of this abstract have provided an email address for comments about the abstract: pspickler@bridgewater.edu