National Aeronautics and Space Administration

Living With A Star

Targeted Research and Technology

Sources of Solar Irradiance Variability: 200-400nm

ROSES ID: NRA-01-OSS-01      Selection Year: 2002      

Program Element: Independent Investigation: Solar Helio LWS

Principal Investigator: Jeff S. Morrill

Affiliation(s): Naval Research Laboratory


The proposed research will examine the sources of solar spectral irradiance variability in the 200-400 nm wavelength range and how the variability of these sources impacts our ability to explain the observed full-disk spectrum. This will involve the analysis of high resolution (~0.01 nm) spectral observations made by the NRL HRTS-9 rocket and SKYLAB spectrograph. The HRTS observations have a spatial resolution of ~ 1 arc-second and the SKYLAB spectra are averaged over spectrograph slit (~60x1 arc-second^2). The three main topics to be examined in this study will be: (1) Use a 3-component model with HRTS-9 plage and sunspot contrast to estimate solar spectral irradiance variability in the region near MgII (283 +/-3 nm) and compare with SUSIM and SOLTICE observations. (2) Use SKYLAB spectral observations in the 200-400 nm range to determine wavelength dependent contrast of plage and contrast variation within the quiet sun. (3) Use above model to compare predicted vs observed intensity over 200-400 nm range.


Performance YearReferenceInvestigation TypeActions
1Sources of Solar Irradiance Variability: 200-400nm - Morrill...
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Performance YearReferenceActions
1Morill, J. S.; (2003), A Model of Solar Spectral Irradiance ...
1Morrill, J.; Korendyke, C.; Dere, K.; (2004), A Compari...
1Morrill, J.; Korendyke, C.; Dere, K.; (2004), Solar UV...

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