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<p>I did a bit more on this today. The results distributed
yesterday were from the 'decimated' database, with 1 MHz spectral
resolution. <br>
</p>
<p>The original file has 125 kHz resolution. so I returned to this
to get better spectral resolution. Images were made for each of
the 128 channels within SPW08 (432 -- 448 MHz), utilizing all the
data over time -- 10:04 -- 15:10 IAT on Nov 04. <br>
</p>
<p>Reflected circular polarization was seen in most channels,
usually at a fairly low level, typically at -0.5 Jy or less.
(Negative means the signal is left circularly polarized -- this is
always the case). But some channels have <b>much</b> higher
levels. Most notable are the channels between 436.5 and 439.0
MHz, where the measured signal varied from -1 to -4.7 Jy. <br>
</p>
<p>To check on time variability, I selected the 'loudest' channel
(437.25 MHz), and made 14 images, one for each observation scan (9
minutes long for each). This gave quite a spectacular result --
peak 'V' signal varied from undetectable (at 13:00 IAT) to a
whopping -28.3 Jy/beam at 14:45. <br>
</p>
<p>For the two scans with the highest reflection (14:45 and 15:05,
IAT), I made full polarization snapshots. Here is a short table
of the peak brightness (always at the center of the lunar disk) in
each of the Stokes parameters: (in Jy/beam). <br>
</p>
<p>Time I Q
U V</p>
<p>---------------------------------------------------------------------------</p>
<p>14:45 37.2 -9.8
9.5 -28.3</p>
<p>15:05 34.3 -12.3
7.1 -26.4</p>
<p>----------------------------------------------------------------------------</p>
<p>For reference, the disk brightness at this frequency and
resolution is typically 1 Jy/beam. The total disk flux at this
frequency is about 70 Jy. The synthesize beam width is 220
arcseconds. <br>
</p>
<p>Although it might be useful to investigate shorter time intervals
(the data are originally sampled at 2 seconds) and more
frequencies, I have many other things to do. But if anybody wants
to poke around some more, I can export the data. <br>
</p>
<p>Rick<br>
</p>
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