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Active Region Observing Campaign Data (1Jun92)
(from NSO, NOAO Newsletter No. 30, 1 June 1992)

The Air Force group at NSO/SP has just completed a 20-day observing
campaign on solar active region evolution. During these campaigns
target active regions are selected, normally coinciding with the Max
'91/Flare 22 targets chosen for Yohkoh and/or COMPTON and the VLA.
These regions are observed on a daily basis for periods of several
hours each day. Instruments used include the narrowband filter at the
VTT, the spectroheliograph (SHG) at the Evans Facility and the vector
magnetograph (VMG) at the Hilltop facility. In addition, the normal
activity patrol instruments are used. During April, several of the
observed regions produced flares, and thus a fairly good set of
pre-activity build-up data was obtained. Observations were obtained for
National Oceanic and Atmospheric Administration Active Regions 7124 (4
Apr), 7123 (5-10 Apr), 7128 (12, 13, 15, 16 Apr), 7131 (14 Apr), 7132
(17, 18 Apr), and 7135 (20 Apr).  The narrowband filter is tuned
through several magnetic and non-magnetic lines, using a 1/4 wave plate
to measure the magnetic field. The field of view of the narrowband
filter is about 1 arcmin in diameter, so only a portion of the active
region is imaged. The VMG uses lambda6122 to make line-of-sight and
transverse magnetic field measurements with a field of view of 4
arcmin x 5 arcmin. The SHG is used to scan the Sun in Ha and the Ca K
line. All of the data are available for collaborative studies of these
active regions. Please contact Steve Keil (505 434-7039) or K.S.
Balasubramaniam (505 434-7047) if you are interested in the data or
collaborations.

Stephen Keil

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