Limb Brightening and Darkening of Solar Active Regions at Ultraviolet Wavelengths Determined from UARS/SUSIM Ultraviolet Irradiance Measurements

Details Limb Brightening and Darkening of Solar Active Regions at Ultraviolet Wavelengths Determined from UARS/SUSIM Ultraviolet Irradiance Measurements Limb Brightening and Darkening of Solar Active Regions at Ultraviolet Wavelengths Determined from UARS/SUSIM Ultraviolet Irradiance Measurements

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp32b04c&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP32B-04

Physics

7537 Solar And Stellar Variability, 7538 Solar Irradiance, 7549 Ultraviolet Emissions

Scientific paper

We report the first quantitative measurements of the limb brightening and darkening of solar active regions at ultraviolet wavelengths, based upon Fourier analysis of the rotationally modulated mid-resolution (1.1- nm) ultraviolet irradiances measured by the Solar Ultraviolet Spectral Irradiance Monitor (SUSIM) on the Upper Atmospheric Research Satellite (UARS). Significant results have been obtained for the wavelength range 142-265 nm. We find weak limb brightening at short wavelengths and weak, perhaps insignificant, limb darkening at long wavelengths. Sharp transitions occur at the Si I and Al I edges at 168.2 nm and 207.6 nm, respectively, which bound a region of strong limb darkening. The quiet disk also exhibits weak limb brightening at short wavelengths, but has transitions to weak/medium and medium limb darkening at the Si I and Al I edges at 152.1 nm and 207.6 nm, respectively. Analysis of the Ly- (121.6 nm) index illustrates how the field-of-view response can introduce a significant instrumental effect to such measurements. This work was supported by NASA-Defense Purchase Requests S14798D and S10108X.

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