[daip] stokes 'rl'
Eric Greisen
egreisen at nrao.edu
Fri Jun 10 12:01:25 EDT 2005
Jacob Eggers writes:
> What does it mean to have a wild spread of gains on the stokes 'rl'?
The numbers below indicate variations from 3 to 14 mJy on the
first baseline, 16-28 mJy on the second one and so forth. The
variation with time is I expect simply noise. A noise of 20 mJy per
baseline in 10 sec is expected so about 13 mJy in 30 sec. Calibration
of the polarization may make these numbers change (e.g. 2-13 is almost
certainly affected by bigger leakage terms than is 1-13). Data like
this are better examined after polarization calibration than before.
> Source=1635+381 : 0000, Stokes=LR , IFS= 1- 1, Chans= 1- 1
> Flux = 0.0000 Jy, Calcode = B , Freq = 4.885100000 GHz
> Amplitudes, 1000 = 0.001 Jy, averging type = Vector
>
> Baselines 1-13 2-13 3-13 4-13 5-13 6-13 7-13 8-13 9-13
> 0/12:19:50 8688 17521 9278 7279 13522 5885 2025 9887 18261
> 0/12:20:20 8865 17958 6920 5827 14991 10986 2725 13308 16101
> 0/12:20:50 5215 26307 2341 6704 12853 7163 2938 7540 15999
> 0/12:21:20 14898 16992 5336 5901 10333 8641 11915 11699 20254
> 0/12:21:50 10371 18500 8031 8163 12987 9947 4038 6036 16388
> 0/12:22:20 13622 20734 6490 11995 16332 12323 6315 12366 19197
> 0/12:22:50 3629 19229 5668 8899 10642 16223 8943 10598 22311
> 0/12:23:20 12748 27511 5247 7703 9770 10360 4590 3900 21904
> 0/12:23:45 13873 26784 9347 13693 8759 12643 931 9449 25595
>
> this is before any calibrations or flagging.
Eric Greisen
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