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Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows

Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows. G. Fisher, Y. Li, B. Welsch. 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

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Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows

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  1. Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows G. Fisher, Y. Li, B. Welsch

  2. 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

  3. 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…

  4. Test velocity inversion methods… • Data movie • Doppler movie • LCT • ILCT • MEF

  5. FGE Data Movie (BACK)

  6. FGE Doppler Map (BACK)

  7. LCT Results

  8. MEF Horiz (LCT)

  9. MEF V_z (DOPPLER)

  10. ILCT Horiz (LCT)

  11. ILCT V_z (DOPPLER)

  12. ADC V_z (DOPPLER)

  13. 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.

  14. ILCT, cont’d: Find • Similar to MEF, use scalar potentials: • As w/MEF: indn eqn. fixes ; ass’d. • Instead of minimizing ‘energy’ to find , ILCT uses LCT to constrain :

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