February 23, 2003



20030223.195045_mk4

Center =148.17+/-1.19 degrees PA (SE quadrant) (red radial line)
Maximum height = 1.53+/-0.07 Rsun
Width (at 1.20 Rsun) = 30.47+/-0.91 degrees latitude (measured between edges -- vertical dashed lines at inflection points)
Width (at 1.36 Rsun) = 20.03+/-1.46 degrees latitude
Cavity depletion, equatorward (1.20 Rsun) = 0.19+/-0.016 (ratio of red to blue dashed line)
Cavity depletion, equatorward (at 1.36 Rsun) = 0.11+/-0.018 (ratio of red to blue dashed line)
Cavity depletion, poleward (1.20 Rsun) = 0.07+/-0.019 (ratio of green to blue dashed line) Minimum intensity in cavity (1.20 Rsun) = 2.9e-07+/-2.9e-09 (Bsun) (blue dashed lines); Position of minimum intensity = 144.46+/-1.02 (blue star)
Cavity depletion, poleward (1.36 Rsun) = 0.03+/-0.019 (ratio of green to blue dashed line) Minimum intensity in cavity (1.36 Rsun) = 1.8e-07+/-1.8e-09 (Bsun) (blue dashed lines); Position of minimum intensity = 157.57+/-0.25 (blue star)
Slope at equatorward cavity edge (1.20 Rsun) = -1.0e-08+/-5.7e-09 (Bsun/degree)
Slope at equatorward cavity edge (1.36 Rsun) = -4.2e-09+/-3.6e-09 (Bsun/degree)
Slope at poleward cavity edge (1.20 Rsun) = 6.6e-09+/-5.7e-09 (Bsun/degree)
Slope at poleward cavity edge (1.36 Rsun) = 3.4e-09+/-3.6e-09 (Bsun/degree)

length lower limit = 2 days visible in white light at limb February 23; -24**;

Recurrence =West limb January 6**; -9; West limb February 6**; -7; -8; -9; -10; -11; East limb February 23; -24**; Visible Dec 2002. Also not shown: ~Jan 23 East limb, March 4-5-6-7-8... West limb
Evolution comments = Again only a small piece of filament visible in H-alpha, but quite high polar cavity visible recurrently for 2-3 months at least. Originally visible Dec 31, then Jan 6-9 West limb, then around Jan 23 East limb (not shown), then West limb Feb 23-24, poss 25, poss a little 26, although obscured. LASCO EIT out Feb 25-26. Possibly affected by filament erupt/CME Feb 28, although this mainly affects long, kinked CF closer to equator. Cavity shows up again nicely at West limb on March 4-5-6-7-8...

Neutral line orientation at the limb =
CME/dimmings association = CME poss. affected by CF (closer to equator) eruption Feb 28 2003; prominence eruption on February 28;

Active region association = N/A

Filament/FC association = small prom at limb -- piece of PCF; 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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