Sunspot Intensity Variations at Infrared Wavelengths

Details Sunspot Intensity Variations at Infrared Wavelengths Sunspot Intensity Variations at Infrared Wavelengths

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.8803s&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #88.03; Bulletin of the American Astronomical Society, Vol. 33, p.1433

Physics

Scientific paper

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.

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