A program of photometric measurements of solar irradiance fluctuations from ground-based observations

Details A program of photometric measurements of solar irradiance fluctuations from ground-based observations A program of photometric measurements of solar irradiance fluctuations from ground-based observations

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3086...16c&link_type=abstract

In NASA, Goddard Space Flight Center, Climate Impact of Solar Variability p 16-20 (SEE N91-12456 03-92)

Computer Science

Faculae, Irradiance, Photometry, Radiometers, Solar Activity Effects, Solar Radiation, Sun, Sunspots, Variations, Bolometers, Cavities, Light (Visible Radiation), Monitors, Observatories, Telescopes, Viewing

Scientific paper

Photometric observations of the sun have been carried out at the San Fernando Observatory since early 1985. Since 1986, observations have been obtained at two wavelengths in order to separately measure the contributions of sunspots and bright facular to solar irradiance variations. Researchers believe that the contributions of sunspots can be measured to an accuracy of about plus or minus 30 ppm. The effect of faculae is much less certain, with uncertainties in the range of plus or minus 300 ppm. The larger uncertainty for faculae reflects both the greater difficulty in measuring the facular area, due to their lower contrast compared to sunspots, and the greater uncertainty in their contrast variation with viewing angle on the solar disk. Recent results from two separate photometric telescopes will be compared with bolometric observations from the active cavity radiometer irradiance monitor (ACRIM) that was on board the Solar Max satellite.

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