December 17,1998



19981217.181641_mk4

Center =195.33+/-0.99 degrees PA (SW quadrant) (red radial line)
Maximum height = 1.34+/-0.02 Rsun
Width (at 1.20 Rsun) = 6.57+/-1.02 degrees latitude (measured between edges -- vertical dashed lines at inflection points)
Width (at 1.27 Rsun) = 6.14+/-0.97 degrees latitude

Cavity depletion, equatorward (at 1.27 Rsun) = 0.30+/-0.014 (ratio of red to blue dashed line)

Cavity depletion, poleward (1.27 Rsun) = 0.19+/-0.023 (ratio of green to blue dashed line) Minimum intensity in cavity (1.27 Rsun) = 4.5e-07+/-4.5e-09 (Bsun) (blue dashed lines);

Slope at equatorward cavity edge (1.27 Rsun) = 2.3e-08+/-9.0e-09 (Bsun/degree)

Slope at poleward cavity edge (1.27 Rsun) = -2.3e-08+/-9.0e-09 (Bsun/degree)

length lower limit = 8 days visible in white light at limb December 12; -13; -14; -15***; -16**; -17; -18; -19 (CME!);

Also visibile Feb 4-5 1999
Evolution comments = PCF-S which erupts Dec 19 -- visible in Mk4, but not great quality. Also visible Feb 4-5 1999.

Neutral line orientation at the limb =
CME/dimmings association = CME December 19; prominence eruption on December 19;

Active region association = N/A

Filament/FC association = PCF-S; PCF

Other comments: N/A

Filament - visible in white light

Necking - straight up and down 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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