Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh43a1503y&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH43A-1503
Physics
7537 Solar And Stellar Variability (1650), 7538 Solar Irradiance, 7974 Solar Effects
Scientific paper
We don't have direct measurement of the past solar spectral irradiance before achievement of its measurement from the space. The SORCE satellite (Rottman, et al., 2005), which was launched in 2003, is monitoring solar spectra from UV to IR wavelengths. It makes possible to know daily solar spectral irradiance variations due to various features on the solar surface, and this kind of observations are useful for the earth's atmospheric model to yield progress in understanding a connection between the sun and global climate change. Some studies (e.g., Unruh, et al., 2000) adopted three components (sunspot, facular, and quiet region) for modeling solar irradiance variations. Here, we also regarded these components as solar features for spectral irradiance variations. Firstly, we tried to estimate average spectrum of these three components respectively from the SORCE data as accurate as possible. Additionally, we used Ca K image data taken by the Big Bear Solar Observatory in order to find counterparts of solar spectral variations in the solar features. One of the reasons why we used Ca K data is that there are abundant historical data of Ca K observation nearly 90 years long. Also, it might make it easy to analogize the relationship between solar and stellar chromospheric variability and let it introduce to long term solar spectral variations. These advantages will be related to the further studies. In this study, we focused on July 2004. This period is characterized by the minimum of total solar irradiance through the year 2004. We defined certain thresholds from intensity distribution of a Ca K image and then estimated sunspot and facular areas. For this analysis, we used only good quality SORCE data without any discontinuity in spectrum. Finally, considering that there is a one-to-one correspondence between surface coverage rates of three components and spectral variations, we carried out a regression analysis and obtained solar spectra of sunspot, facular and quiet region respectively.
Masuda Seiji
Sato Joe
Yokoyama Makoto
No associations
LandOfFree
Reconstruction of the Past Solar Spectra (1) Deduced Solar Spectra of Sunspots, Faculae and Quiet Regions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Reconstruction of the Past Solar Spectra (1) Deduced Solar Spectra of Sunspots, Faculae and Quiet Regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reconstruction of the Past Solar Spectra (1) Deduced Solar Spectra of Sunspots, Faculae and Quiet Regions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-968431