Download - Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows G. Fisher, Y. Li, B. Welsch
![Page 1: Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows G. Fisher, Y. Li, B. Welsch](https://reader030.vdocuments.site/reader030/viewer/2022032703/56649d255503460f949fba6f/html5/thumbnails/1.jpg)
Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows
G. Fisher, Y. Li, B. Welsch
![Page 2: Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows G. Fisher, Y. Li, B. Welsch](https://reader030.vdocuments.site/reader030/viewer/2022032703/56649d255503460f949fba6f/html5/thumbnails/2.jpg)
Discussion Topics
• G. Fisher: LCT, ILCT
• Y. Li: LCT applied to data, masking (thr), convergence/cancellation/rotation
1. 12 May 1997
2. 25-26 Sept. 1996
3. 28-29 Oct. 2003
• B. Welsch: reality check – FGE data
![Page 3: Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows G. Fisher, Y. Li, B. Welsch](https://reader030.vdocuments.site/reader030/viewer/2022032703/56649d255503460f949fba6f/html5/thumbnails/3.jpg)
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
t ~85 min.• Doppler maps, too! (No info. on method.)• Tracking of white light images underway…
![Page 4: Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows G. Fisher, Y. Li, B. Welsch](https://reader030.vdocuments.site/reader030/viewer/2022032703/56649d255503460f949fba6f/html5/thumbnails/4.jpg)
Test velocity inversion methods…
• Data movie
• Doppler movie
• LCT
• ILCT
• MEF
![Page 5: Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows G. Fisher, Y. Li, B. Welsch](https://reader030.vdocuments.site/reader030/viewer/2022032703/56649d255503460f949fba6f/html5/thumbnails/5.jpg)
FGE Data Movie
(BACK)
![Page 6: Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows G. Fisher, Y. Li, B. Welsch](https://reader030.vdocuments.site/reader030/viewer/2022032703/56649d255503460f949fba6f/html5/thumbnails/6.jpg)
FGE Doppler Map
(BACK)
![Page 7: Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows G. Fisher, Y. Li, B. Welsch](https://reader030.vdocuments.site/reader030/viewer/2022032703/56649d255503460f949fba6f/html5/thumbnails/7.jpg)
LCT Results
![Page 8: Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows G. Fisher, Y. Li, B. Welsch](https://reader030.vdocuments.site/reader030/viewer/2022032703/56649d255503460f949fba6f/html5/thumbnails/8.jpg)
MEF Horiz(LCT)
![Page 9: Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows G. Fisher, Y. Li, B. Welsch](https://reader030.vdocuments.site/reader030/viewer/2022032703/56649d255503460f949fba6f/html5/thumbnails/9.jpg)
MEF V_z
(DOPPLER)
![Page 10: Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows G. Fisher, Y. Li, B. Welsch](https://reader030.vdocuments.site/reader030/viewer/2022032703/56649d255503460f949fba6f/html5/thumbnails/10.jpg)
ILCT Horiz(LCT)
![Page 11: Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows G. Fisher, Y. Li, B. Welsch](https://reader030.vdocuments.site/reader030/viewer/2022032703/56649d255503460f949fba6f/html5/thumbnails/11.jpg)
ILCT V_z(DOPPLER)
![Page 12: Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows G. Fisher, Y. Li, B. Welsch](https://reader030.vdocuments.site/reader030/viewer/2022032703/56649d255503460f949fba6f/html5/thumbnails/12.jpg)
ADC V_z(DOPPLER)
![Page 13: Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows G. Fisher, Y. Li, B. Welsch](https://reader030.vdocuments.site/reader030/viewer/2022032703/56649d255503460f949fba6f/html5/thumbnails/13.jpg)
• Apparent horizontal motion can be either true horizontal motion, or vertical motion of a tilted field geometry.
zzzzz
vB - vB uBvB
B - v u
ILCT: Reinterpret LCT, a la Demoulin & Berger (2003)
![Page 14: Time Series of Magnetograms: Evolution, Interpretations, Inferring Flows G. Fisher, Y. Li, B. Welsch](https://reader030.vdocuments.site/reader030/viewer/2022032703/56649d255503460f949fba6f/html5/thumbnails/14.jpg)
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 :
)uB( 2LCTz
)z (vB-BvuB- zzz
0Bv