Finding the Sources of Irradiance Variation at Sunspot Minimum

Details Finding the Sources of Irradiance Variation at Sunspot Minimum Finding the Sources of Irradiance Variation at Sunspot Minimum

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh51e..02r&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH51E-02

Physics

7538 Solar Irradiance, 1650 Solar Variability

Scientific paper

In 2006-2007 the Solar Bolometric Imager (SBI) and the Multi-Spectral Imager (MSI) will operate in the polar stratosphere where near-space conditions can be attained for 10 to 20 days. The instruments will provide bolometric (wavelength-integrated light) and color temperature images of the Sun. At the upcoming sunspot minimum, SBI observations will be able to detect subtle sources of solar irradiance variation with the least confusion by signals from the magnetic fields. This is the best observational approach to characterizing potential causes of the long-term irradiance variations. Possible predicted sources of secular variability include torsional waves and meridional flow variations. SBI uses a 30-cm diameter F/12 Dall-Kirkham telescope with uncoated mirrors, and neutral density filters to provide broadband (bolometric) sensitivity that varies only by ±7 percent over the wavelengths from 0.28 microns to 2.6 microns. The MSI is a CCD-based imager that will provide diagnostics of solar magnetic and thermal structures while SBI assesses their radiance. Sunspots, faculae and magnetic network will be identified from the MSI images. Sonic filtering of the MSI images will isolate the oscillatory signal. That signal will be used to remove oscillations from SBI averages to reduce the solar noise. Inferred solar irradiance variations will be compared with SORCE/TIM and ACRIMSAT measurements. The images and data products will be openly available via the Web.

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