October 19, 1999



19991019.170932_mk4

Center =194.79+/-0.68 degrees PA (SW quadrant) (red radial line)
Maximum height = 1.38+/-0.06 Rsun
Width (at 1.20 Rsun) = 10.93+/-0.69 degrees latitude (measured between edges -- vertical dashed lines at inflection points)
Width (at 1.28 Rsun) = 10.94+/-0.66 degrees latitude
Cavity depletion, equatorward (1.20 Rsun) = 0.21+/-0.016 (ratio of red to blue dashed line)
Cavity depletion, equatorward (at 1.28 Rsun) = 0.11+/-0.018 (ratio of red to blue dashed line)
Cavity depletion, poleward (1.20 Rsun) = 0.23+/-0.015 (ratio of green to blue dashed line) Minimum intensity in cavity (1.20 Rsun) = 2.8e-07+/-2.8e-09 (Bsun) (blue dashed lines);
Cavity depletion, poleward (1.28 Rsun) = 0.18+/-0.016 (ratio of green to blue dashed line) Minimum intensity in cavity (1.28 Rsun) = 2.0e-07+/-2.0e-09 (Bsun) (blue dashed lines);
Slope at equatorward cavity edge (1.20 Rsun) = 1.7e-08+/-5.6e-09 (Bsun/degree)
Slope at equatorward cavity edge (1.28 Rsun) = 6.5e-09+/-4.0e-09 (Bsun/degree)
Slope at poleward cavity edge (1.20 Rsun) = -2.0e-08+/-5.6e-09 (Bsun/degree)
Slope at poleward cavity edge (1.28 Rsun) = -1.3e-08+/-4.0e-09 (Bsun/degree)

length lower limit = 1 days visible in white light at limb October 19**;

Recurrence =West limb September 18; -19; East limb October 1**; West limb October 19**; East limb November 2**; West limb November 18; -19 (CME!); West limb December 13; Also visible Feb-Apr 2000
Evolution comments = PCF-S -- 8 month supersystem. No LASCO CME movies Oct 1-5 -- but fil visible in 304 for several days so probably doesnt erupt then. No Mk4 data Oct 20-23, but no LASCO CME in the right place then. Likewise, no Mk4 dat Nov 3-7, but no LASCO CME. Cavity visible Nov 18 (no data Nov 17) and blows in a ***MK4 CME*** on Nov 19! No Mk4 Dec 1-6... Cavity visible Dec 13, then not clear soon thereafter -- no CME in LASCO, no EIT images to compare to. Dec 27 the PCF-S is not visible, but a higher, angled CF with nice bulbous cavity is that erupts (see next system). PCF-S becomes clear again in H-alpha, and eventually part of this PCF-S shows cavity Feb - Apr 2000.

Neutral line orientation at the limb =
CME/dimmings association = CME Nov 19;

Active region association = N/A

Filament/FC association = PCF-S -- note lower of two CF; PCF-S - note lower of 2 CF

Other comments: N/A

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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