The sigmoidal target will be chosen using Yohkoh SXT observations on the first day that a sigmoid can be clearly established.  The target choice will then be e-mailed to the sigmoid mailing list.  Instruments should begin observing as soon as possible.  The sigmoid will probably be identified as such approximately 2-3 days before it reaches central meridian.  Observations should be taken on the disk and at the limb, to the extent that each instrument can get useful data.  This sigmoid Target of Opportunity (TOO) JOP will take precedence over other WSM3 JOPs, although these can continue at a reduced level of time commitment during the sigmoid JOP.  See Planning Page for information on the other WSM3 JOPs, and the Calendar for the scheduling of these JOPs during WSM3.

SOHO/MDI, Wilcox Solar Observatory (WSO):  High resolution observations (assuming sigmoid is in the north and near central meridian) will occur throughout the day, with focus on the period 1400 to 2400 UT.

Mees Solar Observatory:  Observations between 1700 and 2400 UT.  On disk only.

Sacramento Peak ASP: Observations taken only during the period September 1-12.  Best observations 1400 to 1700 UT.  On disk only.

Sept. 10-14:  Other ground based magnetic observations (including GCT, VTT (Tenerife) and DOT, SVST (La Palma) ) 07.00 - 17.00 UT. On disk only.

Yohkoh SXT: Starting on 18 August SXT has contact passes in the time range 08-15 UT. This means that Yohkoh input can start at about 09 UT on 18 August,  each day after that earlier by about half an hour per day.

SOHO/UVCS: Observations at the limb only, between 1500 and 2400 UT.

SOHO/LASCO:  Continuous synoptic observations. relevent to sigmoid at the limb only.

SOHO/CDS:   Observations taken between 1500 and 2300 UT. Observations will be taken for 4 days on the disk, and then after a gap of ~2 days, again for 2 days at the limb.

SOHO/EIT:  Continuous synoptic observations.

TRACE: Observations focussed on 1400 - 2400 UT.  Additional observations may occur at other hours in order to occur during the same time periods as Yohkoh's.  Observations will be taken for 4 days on the disk, and then after a gap of ~2 days, again for 2 days at the limb.

Mauna Loa Solar Observatory:  Best observations between 1700 and 2400 UT. 

Helio Research :  Best observations between 15:00 and 01:00

Modra Astronomical Observatory: Best observations between

Ooty Radio Telescope:   IPS observation.

Nagoya Radio Telescope:   Between 2200 and 0700 UT.  IPS observation.

EISCAT Radio Telescope:   September 12-17, between 0500 and 1500 UT.  IPS observation.
 

MAX Millenium study of eruptive flares associated with sigmoids :  this campaign is designed to be globe-spanning, and so observations will be taken over a range of times.