I wanted to thank Kurt for giving the heads up about the sunspot. We looked at it yesterday around 6 p.m. along with four neighbors who wandered over to see what we were up to now. In an unscientific mode, we all decided the pattern inside the spot looked suspiciously like at duck face grinning at us. How long do sunspots typically stay visible? Thanks again! Ann M. Blanchard Executive Assistant to the Assoc. VP Undergraduate Studies 110 Sill University of Utah (801) 581-3188 a.blanchard@ugs.utah.edu
Ann, sunspots can form and dissipate at any time, but- It takes the sun just under a month to rotate once on it's axis, so if you catch the spot as soon as it rotates into view, you have about a two-week period of visibility assuming it doesn't dissipate before it rotates out-of-view. Sometimes they last long enough to come around again. But no guarantees. I keep a small white-light solar telescope in my office and often check the sun at lunchtime, weather permitting. On 5/1/07, Ann Blanchard <a.blanchard@ugs.utah.edu> wrote: How long do sunspots typically stay visible?
A scope a work sounds great, is yours a Coronado? Ann M. Blanchard Executive Assistant to the Assoc. VP Undergraduate Studies 110 Sill University of Utah (801) 581-3188 a.blanchard@ugs.utah.edu -----Original Message----- From: utah-astronomy-bounces+a.blanchard=ugs.utah.edu@mailman.xmission.com [mailto:utah-astronomy-bounces+a.blanchard=ugs.utah.edu@mailman.xmission .com] On Behalf Of Chuck Hards Sent: Tuesday, May 01, 2007 9:22 AM To: Utah Astronomy Subject: Re: [Utah-astronomy] Sunspot Ann, sunspots can form and dissipate at any time, but- It takes the sun just under a month to rotate once on it's axis, so if you catch the spot as soon as it rotates into view, you have about a two-week period of visibility assuming it doesn't dissipate before it rotates out-of-view. Sometimes they last long enough to come around again. But no guarantees. I keep a small white-light solar telescope in my office and often check the sun at lunchtime, weather permitting. On 5/1/07, Ann Blanchard <a.blanchard@ugs.utah.edu> wrote: How long do sunspots typically stay visible? _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.utahastronomy.com
No, it's home-made as is most of my equipment. White-light only, using Baader filter material. I don't purchase very many commercial items. I've got all the materials I need to build my own coronascope, which is a home-made substitute for a H-a filtered-scope. It uses a diffraction grating to isolate specific wavelengths, instead of a narrow-passband filter. Old-school stuff. On 5/1/07, Ann Blanchard <a.blanchard@ugs.utah.edu> wrote:
A scope a work sounds great, is yours a Coronado?
Just a friendly reminder about the hazards of solar observing when using unsafe solar filters: http://www.lpl.arizona.edu/~rhill/temp/unsafe_solar_filters.jpg :o) __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
participants (3)
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Ann Blanchard -
Chuck Hards -
Richard Tenney