19991228.175053

December 28, 1999

19991228.175053_mk4

Center =138.94+/-0.53 degrees PA (SE quadrant) (red radial line)	Maximum height = 1.62+/-0.02 Rsun
Width (at 1.20 Rsun) = 27.23+/-0.37 degrees latitude (measured between edges -- vertical dashed lines at inflection points)	Width (at 1.41 Rsun) = 19.99+/-0.70 degrees latitude
Cavity depletion, equatorward (1.20 Rsun) = 0.37+/-0.013 (ratio of red to blue dashed line)	Cavity depletion, equatorward (at 1.41 Rsun) = 0.08+/-0.018 (ratio of red to blue dashed line)
Cavity depletion, poleward (1.20 Rsun) = 0.17+/-0.017 (ratio of green to blue dashed line) Minimum intensity in cavity (1.20 Rsun) = 3.2e-07+/-3.2e-09 (Bsun) (blue dashed lines);	Cavity depletion, poleward (1.41 Rsun) = 0.15+/-0.017 (ratio of green to blue dashed line) Minimum intensity in cavity (1.41 Rsun) = 1.2e-07+/-1.2e-09 (Bsun) (blue dashed lines);
Slope at equatorward cavity edge (1.20 Rsun) = -2.3e-08+/-6.5e-09 (Bsun/degree)	Slope at equatorward cavity edge (1.41 Rsun) = -6.4e-09+/-2.4e-09 (Bsun/degree)
Slope at poleward cavity edge (1.20 Rsun) = 1.4e-08+/-6.5e-09 (Bsun/degree)	Slope at poleward cavity edge (1.41 Rsun) = -8.2e-10+/-2.4e-09 (Bsun/degree)

length lower limit = 2 days visible in white light at limb December 26***; -28 (LASCO/EIT CME (29)!);
No Recurrence analyzed
Evolution comments = Angled CF-S -- originally mistaken for part of Sept - Dec 99 cavity system, but turns out higher latitude, related to different filament channel. Nice and bulbous cavity Dec 26. Bad Mk4 data Dec 27, poss visible 28, gone 29 -- and indeed, the PCF appears to erupt in EIT and LASCO on Dec 29. Too early for Mk4, unfortunately.

Neutral line orientation at the limb =
CME/dimmings association = CME LASCO December 29; prominence eruption on December 29;
Active region association = N/A
Filament/FC association = Angled CF-S; Angled CF-S
Other comments: N/A
Filament - only visible in H-alpha or EUV
Necking - bulging neck

Cavity list (e.g. Tables 2 + 3)
Full list of cavity days observed
List of best cavity days (SET 1) observed (e.g. Table 1)
CMEs associated with cavities (e.g. Tables 7 + 8)
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