Physics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........92l&link_type=abstract
Thesis (PH.D.)--MICHIGAN STATE UNIVERSITY, 1992.Source: Dissertation Abstracts International, Volume: 54-01, Section: B, page: 0
Physics
Scientific paper
The solar irradiance was observed to be varying with time scale of days to the 11 years solar cycle time scale. The daily variations were well correlated with the passage of the dark sunspots and bright facular area on the photosphere. However, the cause of the small irradiance variation with amplitude of 10^{-3 } of the total solar irradiance correlated with the solar cycle is not well understood. Several scenarios with observable surface effects were suggested by various authors to explain this phenomenon, but no observational confirmation is available up to date. Thus, a precision Solar Photometric Telescope (SPT) was constructed to study the large scale brightness structure of the solar photosphere. This instrument does full disk, broad band (10 nm FWHM), two colors (500 nm and 650 nm) imaging of the solar photosphere. Photometry with a newly constructed Infrared Array Camera (IAC) extends these measurements to 1.2, 1.6 and 2.2 micron. This dissertation reports the observations done with these instruments, which revealed low contrast brightness structures with scale ranging from 10^4 km to some fraction of the solar disk on the solar photosphere. The contribution of these structures to the total solar irradiance were discussed.
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