Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9201m&link_type=abstract
American Astronomical Society Meeting 210, #92.01; Bulletin of the American Astronomical Society, Vol. 39, p.208
Astronomy and Astrophysics
Astronomy
Scientific paper
In the summer of 2006 the minimum umbral intensity of sunspots was studied for over 3000 sunspots observed by the Kitt Peak Vacuum Telescope from November, 1992, to September, 2003. A trend was found in the variation of the minimum intensity that was tied to the solar cycle--minimum umbral intensity increased from solar maximum to minimum, and decreased from solar minimum to maximum. These results agreed with several previous works on the subject. In the fall of 2006 the minimum umbral intensity was investigated once more using sunspots observed through the Michaelson Doppler Imager (MDI) instrument on the Solar and Heliospheric Observatory (SOHO) satellite. The same analysis software was used on the MDI data as on the KPVT data, studying over 4500 sunspots from June, 1996, to December, 2005. Results of this analysis will be compared with the KPVT results, and with those of previous works.
This work is carried out through the National Solar Observatory Research Experiences for Undergraduate (REU) site program, which is co-funded by the Department of Defense in partnership with the National Science Foundation REU Program.
MacDonald Rachel
Penn Matt J.
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