Sunspot 904


  John C McConnell
  Maghaberry, County Antrim, Northern Ireland
Time and Date taken
  12th August 2006 1012ut
13th August 2006 1550ut
17th August 2006 0904ut
20th August 2006 0955ut
20th August 2006 1623ut
21st August 2006 0953ut
Equipment used
  Meade ETX 90mm, Thousand Oaks Glass Solar Filter
Capturing device used
  Philips TouCam Pro 2
Technical details
  10fps, 1/100 shutter speed, frames aligned, stacked and wavelet processed in Registax. Final de-interlace in Paint Shop Pro

Sunspot 904 is continually changing shape and size. We must remember that the sun’s “surface” is not solid; it is composed of a boiling mass of material continually moving. Large sunspot groups are made of pure magnetism. The two ragged components (inside edges) of sunspot 904 are actually magnetic poles. Solar flares occur when opposite magnetic polarities clash together. Perhaps the reason why sunspot 904 has been so quiet is because its poles are so far apart. Almost 100,000 kilometres separate the two components. They are now starting to converge, so that might start some fireworks in the “flare department”. If this happens when the group is on or close to the sun’s meridian, then we might get some aurora from the resulting material’s impact with Earth’s magnetic field. The last picture shows 904 tight on the limb which was a very difficult image to acquire.


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Last Updated : Thursday, August 24, 2021

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