First light with new AO system
On 24 April 2003 we installed a new AO system at the Swedish 1-m Solar
Telescope (SST). The new system has a 37-electrode bimorph mirror from
AOptix Inc. and a 37-microlens Shack-Hartmann wavefront sensor. The
old system had 19 electrode and 19 microlenses.
The following day the seeing was not particularly good
(r0 varied between 3 cm and 7 cm). In spite of that we
managed to collect several good images of Active Region 337, close to
disk center. The best images are shown on this page and were collected
at about 16:05 UT.
G-band 430.5 nm
Note the dark cores in the penumbral filaments, perhaps most visible
(as bright cores) in the negative image. These dark cores were the
first discovery published
from the SST, which was taken into operation in May 2002.
The field of view is approximately 82 arc seconds. The image scale
of the larger images available by clicking on the panels above is
about 0.041 arc seconds per pixel.
Ca II H 396.8 nm
Note that the dark cores exist also in Ca II H light! Again, they are
perhaps easiest to spot in the negative image.
The field of view is approximately 82 arc seconds. The image scale
of the larger images available by clicking on the panels above is
about 0.082 arc seconds per pixel.
Time-stamp: <2003-04-25 23:33:07 mats>
