New Iterative Method of the Azimuth Ambiguity Resolution

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New Iterative Method of the Azimuth Ambiguity
Resolution
Dr. A. Pevtsov National Solar Observatory
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• Magnetic field in the photosphere is not
  current-/force- free
• HOWEVER
• Low resolution magnetograms are well represented
  by
• the potential magnetic field
• Non-potentiality increases with (higher) spatial
  resolution

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Select/change degree of smoothing (Box)
Potential Field (or Up-Down)
(first run)
Original Data
Smoothed magnetogram
Reference azimuths
Ambiguity resolution (acute angle with reference)
(if Box gt pixel)
(if Box size pixel)
Final azimuths
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Current problems/Advantages

• need high resolution magnetograms
• (low res. does not have enough pixels for
  iterations)
• - averaging at 0-360 boundary

y
x

• Advantages
• Fast
• Resolution is done in image plane (full disk
  magnetograms)