Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows

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Time Series of Magnetograms Evolution,
Interpretations, Inferring Flows

• G. Fisher, Y. Li, B. Welsch

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Discussion Topics

• G. Fisher LCT, ILCT
• Y. Li LCT applied to data, masking (thr),
  convergence/cancellation/rotation
• 12 May 1997
• 25-26 Sept. 1996
• 28-29 Oct. 2003
• B. Welsch reality check FGE data

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Flare Genesis Experiment

• Balloon-borne (Antarctic) observations of NOAA
  8844, 25 Jan 2000
• 54 vector magnetograms, 2.3/5.3 min. per
• hi-res 18 pixels (130.5 km), 520 x 520 pix
• LCT at ti differenced over ti /-10, for
• Dt 85 min.
• Doppler maps, too! (No info. on method.)
• Tracking of white light images underway

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Test velocity inversion methods

• Data movie
• Doppler movie
• LCT
• ILCT
• MEF

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FGE Data Movie
(BACK)
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FGE Doppler Map
(BACK)
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LCT Results
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MEF Horiz
(LCT)
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MEF V_z
(DOPPLER)
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ILCT Horiz
(LCT)
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ILCT V_z
(DOPPLER)
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ADC V_z
(DOPPLER)
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ILCT Reinterpret LCT, a la Demoulin Berger
(2003)

• Apparent horizontal motion can be either true
  horizontal motion, or vertical motion of a tilted
  field geometry.

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ILCT, contd Find

• Similar to MEF, use scalar potentials
• As w/MEF indn eqn. fixes
  assd.
• Instead of minimizing energy to find ,
  ILCT uses LCT to constrain