Physics
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ncar.reptq....w&link_type=abstract
Final Report National Center for Atmospheric Research, Boulder, CO. High Altitude Observatory.
Physics
Airglow, Calibrating, Magnetic Flux, Solar Activity, Solar Magnetic Field, Solar Radiation, Solar Spectra, Solar Spectrometers, Chromosphere, Extreme Ultraviolet Radiation, Heating, Irradiance, San Marco Satellites, Solar Corona, Solar Mesosphere Explorer, Time Series Analysis
Scientific paper
The analysis of the solar spectral irradiance from the Airglow-Solar Spectrometer Instrument (ASSI) on the San Marco 5 satellite is the focus for this research grant. A pre-print copy of the paper describing the calibrations of and results from the San Marco ASSI is attached to this report. The calibration of the ASSI included (1) transfer of photometric calibration from a rocket experiment and the Solar Mesosphere Explorer (SME), (2) use of the on-board radioactive calibration sources, (3) validation of the ASSI sensitivity over its field of view, and (4) determining the degradation of the spectrometers. We have determined that the absolute values for the solar irradiance needs adjustment in the current proxy models of the solar UV irradiance, and the amount of solar variability from the proxy models are in reasonable agreement with the ASSI measurements. This research grant also has supported the development of a new solar EUV irradiance proxy model. We expected that the magnetic flux is responsible for most of the heating, via Alfen waves, in the chromosphere, transition region, and corona. From examining time series of solar irradiance data and magnetic fields at different levels, we did indeed find that the chromospheric emissions correlate best with the large magnetic field levels.
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