20011222.174955

December 22, 2001

20011222.174955_mk4

Center =165.94+/-1.16 degrees PA (SE quadrant) (red radial line)	Maximum height = 1.53+/-0.06 Rsun
Width (at 1.20 Rsun) = 26.90+/-0.60 degrees latitude (measured between edges -- vertical dashed lines at inflection points)	Width (at 1.36 Rsun) = 17.82+/-1.73 degrees latitude
Cavity depletion, equatorward (1.20 Rsun) = 0.08+/-0.026 (ratio of red to blue dashed line)	Cavity depletion, equatorward (at 1.36 Rsun) = 0.11+/-0.023 (ratio of red to blue dashed line)
Cavity depletion, poleward (1.20 Rsun) = 0.12+/-0.023 (ratio of green to blue dashed line) Minimum intensity in cavity (1.20 Rsun) = 2.2e-07+/-3.5e-09 (Bsun) (blue dashed lines);	Cavity depletion, poleward (1.36 Rsun) = 0.12+/-0.023 (ratio of green to blue dashed line) Minimum intensity in cavity (1.36 Rsun) = 1.2e-07+/-1.8e-09 (Bsun) (blue dashed lines);
Slope at equatorward cavity edge (1.20 Rsun) = -1.3e-08+/-4.4e-09 (Bsun/degree)	Slope at equatorward cavity edge (1.36 Rsun) = -4.4e-09+/-2.4e-09 (Bsun/degree)
Slope at poleward cavity edge (1.20 Rsun) = 9.6e-09+/-4.4e-09 (Bsun/degree)	Slope at poleward cavity edge (1.36 Rsun) = 5.0e-09+/-2.4e-09 (Bsun/degree)

length lower limit = 3 days visible in white light at limb December 19; -20; -22*** (LASCO/EIT CME (23)!;
No Recurrence analyzed
Evolution comments = Wide cavity over S pole from PCF-S parallel to limb. Also visible Dec 19. No Mk4 data Dec 18, nothing really Dec 17. Visible still Dec 22, no Mk4 data 21, nothing really 23 -- EIT shows erupting filament from the region early Dec 23, and there is a little puff in LASCO, not identified specifically as a CME, and H-alpha shows PCF has disappeared. Note also Dec 20 SW (near equator) cavity eruption (cavity small but visible Dec 19)

Neutral line orientation at the limb =
CME/dimmings association = CME December 23; prominence eruption on December 23;
Active region association = N/A
Filament/FC association = PCF-S nearly parallel to limb; N/A
Other comments: CME on West limb Dec 20 (just South of equator) arises from pre-cursor cavity
Filament - only visible in H-alpha or EUV
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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