Sigmoids

Sigmoids observed with Yohkoh/SXT.

(Description of sigmoid.)

1. 2000/07/14 10:00 -- 23:00 (the Bastille day flare)

Images (click to enlarge)		Movies (javascript)
00:28	13:29	FFI/PFI composites (14-Jul 00:20 -- 23:59).
		FFI/PFI composites (14-Jul 00:20 -- 23:59).

About this event :

Observed from the region NOAA 9077 at a little North of the disk center.
X5.7 flare started at 10:03 with long duration. GOES/XRS flux (1-8A)
Solid analysis by ......

2. 1999/08/16 -- 08/21 (during the 3rd Whole Sun Month campaign)

Images (click to enlarge)			Movies (javascript)
12:29 (8/17)	20:38 (8/17)	17:50 (8/21)	FFI movie (16-Aug 05:22 -- 18-Aug 11:25). PFI movie (16-Aug 07:11 -- 17-Aug 20:59). FFI movie (21-Aug 12:00 -- 22-Aug 05:12).

About this event :

Observed from the region NOAA 8668 in the NE quadrant.
C2.6 flare (8/17 12:32) followed by C5.9 flare (at 16:02, with cusps), GOES/XRS flux (1-8A)
and C2.0 (8/21 17:24, a big inverse-S shape), 4 days later.
Solid analysis by Gibson, et al.(2002) ApJ 574, 1021-1038

3. 1998/06/07 -- 06/10 (a press release event 1)

Images (click to enlarge)			Movies (javascript)
20:03 (6/7)	20:06 (6/8)	07:59 (6/9)	FFI movie (07-Jun 12:00 -- 10-Jun 12:00). PFI movie (07-Jun 14:00 -- 08-Jun 23:40).

About this event :

Observed from the region NOAA 8232 in the Southern hemisphere.
C3.2 flare (6/7 14:43) followed by C5.2 flare (6/8 15:56). GOES/XRS flux (1-8A)
Used in the press release at MSU in 1999.

4. 1997/04/06 -- 04/08 (a press release event 2)

Images (click to enlarge)			Movies (javascript)
19:05 (4/6)	00:02 (4/7)	17:40 (4/7)	FFI movie (06-Apr 12:21 -- 08-Apr 20:16). PFI movie (06-Apr 12:30 -- 07-Apr 17:52).

About this event :

Observed from the region NOAA 8027 in the Southern hemisphere.
After a few partial eruptions (e.g., B2.6 event on 4/6 18:29, B3.7 event on 4/6 23:33),
C6.8 flare (4/7 13:50) occurred forming a cusp. GOES/XRS flux (1-8A)
Used in the press release at MSU in 1999.