20000413B.165926

April 13, 2000 (East limb)

20000413B.165926_mk4

Center =146.73+/-0.74 degrees PA (SE quadrant) (red radial line)	Maximum height = 1.42+/-0.02 Rsun
Width (at 1.20 Rsun) = 13.87+/-0.99 degrees latitude (measured between edges -- vertical dashed lines at inflection points)	Width (at 1.31 Rsun) = 10.26+/-0.48 degrees latitude
Cavity depletion, equatorward (1.20 Rsun) = 0.23+/-0.015 (ratio of red to blue dashed line)	Cavity depletion, equatorward (at 1.31 Rsun) = 0.07+/-0.019 (ratio of red to blue dashed line)
Cavity depletion, poleward (1.20 Rsun) = 0.15+/-0.017 (ratio of green to blue dashed line) Minimum intensity in cavity (1.20 Rsun) = 2.6e-07+/-2.6e-09 (Bsun) (blue dashed lines);	Cavity depletion, poleward (1.31 Rsun) = 0.14+/-0.017 (ratio of green to blue dashed line) Minimum intensity in cavity (1.31 Rsun) = 1.5e-07+/-1.5e-09 (Bsun) (blue dashed lines);
Slope at equatorward cavity edge (1.20 Rsun) = -1.3e-08+/-5.2e-09 (Bsun/degree)	Slope at equatorward cavity edge (1.31 Rsun) = -3.9e-09+/-3.1e-09 (Bsun/degree)
Slope at poleward cavity edge (1.20 Rsun) = 1.2e-08+/-5.2e-09 (Bsun/degree)	Slope at poleward cavity edge (1.31 Rsun) = 8.8e-09+/-3.1e-09 (Bsun/degree)

length lower limit = 1 days visible in white light at limb April 13;
Recurrence =West limb March 27*; March 30; East limb April 13; Also visible Sep-Dec 1999
Evolution comments = Part of 8 month supersystem -- but other limb from other Feb-Apr piece. Also visible March 14,16... West limb -- many other days. Possible eruption April 15 -- but no Mk4 data -- and may be too far from pole. System probably exist longer than shown here. At least two Mk4 eruptions, Feb 5 and Mar 3.

Neutral line orientation at the limb =
CME/dimmings association = CME March 3 (also Feb 5); prominence eruption on March 3;
Active region association = N/A
Filament/FC association = PCF-S; polar crown filament
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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