Overlays of coronal observations:

• Target dates and times
• ~ 14:05 UT, August 19, 1999 (mature filament)
• ~ 18:21 UT, August 21, 1999 (disappearing filament and brightening)
• prejet < 21:00, jet ~ 21:00-22:30 UT, August 26, 1999

• People involved
• MDI - Liu/Zhao/Hoeksema
• BBSO - Qiu
• SOON - Nitta
• CDS - Gibson/Mason/Pike
• TRACE - Fletcher
• EIT - Thompson
• Yohkoh SXT - Alexander
• MLSO Chip&Pics - Gibson/Burkepile/Gilbert/Holzer
• LASCO - Biesecker/St. Cyr

 
• Overlays:

 
• CDS: 8/19 Variation of sigmoidal filament (seen in absorption) with wavelength
• CDS and TRACE: 8/19 CDS contours overlaid on TRACE 171, 284
• SXT and TRACE: 8/19 SXT contours overlaid on TRACE 171, 284
• TRACE and BBSO: 8/19 BBSO H-alpha contours overlaid on TRACE 171
• BBSO and MDI: 8/19 MDI contours overlaid on BBSO H-alpha
• MDI and BBSO: 8/19 BBSO H-alpha contours overlaid on MDI
• BBSO and SXT: 8/19 SXT contours overlaid on BBSO H-alpha
• SXT and BBSO: 8/19 BBSO contours overlaid on SXT
• SXT and MDI: 8/19 MDI contours overlaid on SXT
• SXT and CDS: 8/19 CDS Mg10 contours overlaid on SXT
• MDI and SXT: 8/19 SXT contours overlaid on MDI
• MDI and CDS: 8/19 CDS Mg10 contours overlaid on MDI

 
• CDS:  8/21 Variation of bright sigmoid with wavelength, overlay of Fe 19 contour on other lines
• CDS and TRACE: 8/21 CDS contours overlaid on TRACE 171, 284
• SXT and TRACE: 8/21 SXT contours overlaid on TRACE 171, 284
• CDS, SXT, and TRACE: 8/21 CDS and SXT contours overlaid on TRACE 284
• BBSO and SXT: 8/21 SXT contours overlaid on BBSO H-alpha
• BBSO and TRACE: 8/21 TRACE 284 contours overlaid on BBSO H-alpha
• BBSO and MDI: 8/21 MDI contours overlaid on BBSO
• MDI and SXT: 8/21 SXT contours overlaid on MDI
• SXT and MDI: 8/21 MDI contours overlaid on SXT
• SXT and Mg10: 8/21 CDS Mg10 contours overlaid on SXT
• MDI and Mg10: 8/21 CDS Mg10 contours overlaid on MDI
• Mg10 and MDI: 8/21 MDI contours overlaid on CDS Mg10
• He1 and MDI: 8/21 MDI contours overlaid on CDS He1
• O5 and MDI: 8/21 MDI contours overlaid on CDS O5
• MDI and O5 and He1: 8/21 CDS O5 and He1 overlaid on MDI
• BBSO and O5 and He1: 8/21 CDS O5 and He1 overlaid on BBSO

 
• pre-jet:
• 8/26 PICS: H-alpha contours overlaid on CDS: OV
• 8/26 PICS: H-alpha contours overlaid on CDS: OIV
• 8/26 PICS: H-alpha contours overlaid on CDS: He1
• 8/26 CDS: He1 contours overlaid on CHIP:He10830

• During jet: CDS and MLSO:
• 8/26 Overlays of Chip and CDS He (10830 and 584.33 Ang)
• 8/26 Overlay of Chip and all the CDS lines

Plan of action: Analysis and master overlays (for a single "snapshot" in time, 8/19, 8/21, 8/26) will be supervised by Gibson.  These will be interpreted together in context with the evolution of the sigmoid.

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Whole Sun Month Sigmoid Structure and Evolution Working Group page