19990218.175253

February 18, 1999

19990218.175253_mk4

Center =20.72+/-0.75 degrees PA (NE quadrant) (red radial line)	Maximum height = 1.32+/-0.03 Rsun
Width (at 1.20 Rsun) = 6.37+/-0.53 degrees latitude (measured between edges -- vertical dashed lines at inflection points)	Width (at 1.26 Rsun) = 4.65+/-0.97 degrees latitude
Cavity depletion, equatorward (1.20 Rsun) = 0.49+/-0.035 (ratio of red to blue dashed line)	Cavity depletion, equatorward (at 1.26 Rsun) = 0.42+/-0.032 (ratio of red to blue dashed line)
Cavity depletion, poleward (1.20 Rsun) = 0.10+/-0.018 (ratio of green to blue dashed line) Minimum intensity in cavity (1.20 Rsun) = 3.0e-07+/-3.0e-09 (Bsun) (blue dashed lines);	Cavity depletion, poleward (1.26 Rsun) = 0.13+/-0.040 (ratio of green to blue dashed line) Minimum intensity in cavity (1.26 Rsun) = 2.3e-07+/-6.8e-09 (Bsun) (blue dashed lines);
Slope at equatorward cavity edge (1.20 Rsun) = 3.9e-08+/-6.0e-09 (Bsun/degree)	Slope at equatorward cavity edge (1.26 Rsun) = 3.0e-08+/-4.6e-09 (Bsun/degree)
Slope at poleward cavity edge (1.20 Rsun) = -1.2e-08+/-6.0e-09 (Bsun/degree)	Slope at poleward cavity edge (1.26 Rsun) = -1.9e-08+/-4.6e-09 (Bsun/degree)

length lower limit = 2 days visible in white light at limb February 18; -19***;
No Recurrence analyzed
Evolution comments = PCF-N. Feb 18 19 visible -- no Mk4 Feb 20-21-22. No SOHO CME movies Feb 15-19. No EIT for several days after that. No Mk4 data March 2-7 so do not know if recurs.

Neutral line orientation at the limb =
CME/dimmings association = N/A
Active region association = N/A
Filament/FC association = PCF-N; N/A
Other comments: N/A
Filament - only visible in H-alpha or EUV
Necking - no 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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