Solar Irradiance Variability Modeled Near Mg II Using Plage and Sunspot Contrast Factors Measured by HRTS
Abstract
Empirical models of solar spectral irradiance varaibility combine areas and locations of plage and sunspots with wavelength dependent contrast factors in order to estimate the solar spectrum. At UV wavelengths, these models have relied on estimated or calculated contrast factors that are often at low resolution. Using quiet sun, plage, and sunspot spectra near Mg II at ~ 2800Å measured by the NRL HRTS instrument, we have recently determined the wavelength dependent contrast factors for plage and sunspots. In this presentation we will discuss the use of measured contrast factors in a spectral irradiance model of the 2765 - 2885Å region and the preliminary comparisons of model results with SUSIM observations. These comparisons will examine spectral irradiance variations on solar rotational and solar cycle time scales.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2001
- Bibcode:
- 2001AGUFMSH11C0733M
- Keywords:
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- 1650 Solar variability;
- 7536 Solar activity cycle (2162);
- 7537 Solar and stellar variability;
- 7538 Solar irradiance;
- 7549 Ultraviolet emissions