Subject: ASZ000097h

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• by jules

  Just curious why this is classed as alpha when it appears to have 2 polarities? (I think!)

  Posted March 4, 2014 12:40 PM

• by jules

  Hmm. Maybe what I'm seeing as black south pointing magnetic polarity spots actually aren't. Oh well back to the drawing board-much to learn!

  Posted March 4, 2014 12:53 PM

• by pahiggins

  Good question! It is likely because there is only one sunspot in this image. The hale class only cares about sunspots, not 'mag. fragments'

  Posted March 5, 2014 1:59 AM

• by pahiggins

  Ex: http://solarmonitor.org/region_pop.php?date=20140218&type=shmi_maglc&region=11976 click on the yellow img at bottom to see why its alpha

  Posted March 5, 2014 2:06 AM

• by jules

  Thank you pahiggins! Something has just clicked! I use solarmonitor.org to check solar orientation for my obs and images. Now another use!

  Posted March 6, 2014 9:02 PM

• by pahiggins

  Something I just noticed now: you can click the 'context' button under the image above to see the full-disk image, and determine orientation

  Posted March 7, 2014 1:04 AM