Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1602m&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #16.02; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
This project investigated archival data from the Kitt Peak Vacuum Telescope, to see if there were any time-varying trends in the minimum umbral intensity of sunspots. Using spectroheliograms taken at 8688 Å a sample of over 3000 sunspot observations was gathered, covering the time period from November, 1992 to September 2003. Analysis of this data revealed that there is a pattern to the umbral intensity variation, and that it is tied to the solar cycle. The minimum umbral intensity of sunspots increased from solar maximum to minimum, and decreased from solar minimum to maximum. These results agree with a study of infrared spectra of sunspot umbra, and with a study using data from the Michelson Doppler Imager (MDI) on the SOHO satellite.
This work was 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.
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