Date: Fri, 7 Nov 2003 11:19:33 -0600 (CST)
From: Ed Grafton <egrafton@ghg.net>

Subject: Update: Saturn November 6th 2003 

Hi Saturn Observers

Dr. Agustín Sánchez Lavega has sent along HST images that clearly shows the
structure of the dark area and the following -29 degree white spot that has
been well tracked by several observers. The dark area is most pronounced in
the HST 555nm filterd image. The white spot has more of an amorphous
structure in the 675nm HST image. These features also can be seen in the
images on the 10/24 and 10/28 images that Damian Peach sent along. Please
see Austin's comments below and the attached HST images and tracking graphic.


                        Ed Grafton


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Dear Ed,

Here is an update of the motion of the spots at -29 deg, and an
enlargement of one of them as captured by the HST at the highest possible
resolution. Your dark spot on November 6 is at the edge of the small white
spot (blue track in the graph w_spots.jpg).

Note that whereas the HST spot is "compact" and round in blue (filter 439
nm), it shows structure around it in the other filters. The spot is
located in a weak anticyclonic flow (and probably it is an anticyclone),
and southward (latitudes -35 deg) the HST images in blue-yellow show a
belt with zonal texture. It is probably a cyclonic more turbulent region,
to which your dark spot probably pertains.

I loose the observers list. Could you send this email to them?

Thanks a lot and good observations!

Agustin

****************************************************
Agustin Sanchez Lavega
Dpto. Fisica Aplicada I
Universidad del Pais Vasco
BILBAO (Spain)
e-mail: wupsalaa @ bi.ehu.es
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