34th Solar Physics Division Meeting, June 2003
Session 19 The Changing Solar Interior I
Poster, Wednesday, June 18, 2003, 3:30-5:00pm, Mezzanine

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[19.09] High Resolution Limb Darkening Function Near 2800 /AA/ Measured by HRTS

J. S. Morrill, K. P. Dere, C. M. Korendyke (E. O. Hulburt Center for Space Research, Naval Research Laboratory, Washington DC)

We are currently developing an empirical model of solar spectral irradiance varaibility. This model will combine ground based observations of the areas and locations of plage and sunspots with measured wavelength dependent contrast factors in order to estimate the solar spectrum. One important component of this model is the wavelength dependent limb darking function that must be determined at high resolution. Using quiet sun spectra near Mg II at about 2800 /AA/ measured by the NRL HRTS instrument, we have recently determined this function for the quiet sun. This function shows many features similar to those seen in the active region contast that we have reported earlier. In this presentation we will discuss the method of determining the limb darkening function in the 2765 -2885 /AA/ region and it's impact on the irradiance model.

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