Sunspot!

Always view the Sun safely!
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Christopher K.
Posts: 4562
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

Sunspot!

Post by Christopher K. » December 19th, 2009, 1:13 pm

...and a quite sizable one, too!

Does this mean the beginning of the new cycle? The Solar Weather Prediction Center's x-ray flux graph (http://www.swpc.noaa.gov/today.html#xray) shows much more activity in the past few days than has been seen. However, there are no geomagnetic storms, solar radiation storms or radio blackouts.

Tad Cook reports (http://www.arrl.org/news/stories/2009/12/11/11243/?nc=1) a sunspot appeared 9 December following sixteen days of no sunspots. We have known for some time that sunspots occur; Theophrastus noted them in 325BC.

At the SOHO site, viewers can see current Michelson Doppler Imager scenes. Scientists can use MDI data to "look" below the surface of the Sun. Its limit is ~100,000 kilometers.

MDI-Magnetogram from SOHO:
http://sohowww.nascom.nasa.gov/data/rea ... i_mag/512/

Christopher K.
Posts: 4562
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

Re: Sunspot!

Post by Christopher K. » April 29th, 2014, 4:22 pm

Sometimes a single sunspot can leave the viewer breathless. Sometimes they are visible at 1x magnification (though, I'll say it again, never "glance quickly" at the Sun). On 5 January, Jürg Alean captured an unaided-eye sunspot (AR1944) from his vantage point in Switzerland.

Cardboard solar viewers are still available at the Highland Road Park Observatory; these viewers not only are excellent for these last few months of Solar Cycle 24, but also will come in handy during the partial solar eclipse in October.

The Alean picture was the 8 January APOD:
http://apod.nasa.gov/apod/ap140108.html

Christopher K.
Posts: 4562
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

Re: Sunspot!

Post by Christopher K. » December 28th, 2018, 2:02 pm

Sunspots will be the topic at the next Baton Rouge Astronomical Society meeting, on Monday 14 January at the Highland Road Park Observatory. The speaker will be club member Jim Gutierrez.

Jim may touch upon the beginning of Solar Cycle 25; the meeting starts at 7pm. The Sun was spotless for sixty percent of the 2018 calendar year.

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