TPTCSPNT_080131 -- January 31, 2008 -- Slow Azimuth scans during daytime, plus daytime half-power tracks.
Note: see this page for azimuth track map analysis
Start Ka/Az track at 08:16 AM local time. Ambient temp = -11C
Clear, Sunny weather.
Blocks AzScansCW and AzScansCCW
Scan #1 Scan from -5 to +365 in azimuth; elev = 50 = 2008_01_31_13:16:24.fits (54496.55305556 -
Scan #2 Scan from +362 to -2 in azimuth; elev = 50 = 2008_01_31_15:45:28.fits - 54496.7576851852)
begun at 15:46 UT, Temp = -2C, Finished at 18:10 Temp = 3.2C
Weather is clouding up.
Starting CCB half-power tracks. Block='ccbHalfPower'
Source = 2253+1608 (3C454.3)
Scan number
-----------
3-6 peak/focus on 2253+1608 - failed due to heuristics
8-12 another peak/focus (set relaxed heuristics) (Lpcs = 0.016, -0.126) ok
13-17 repeat peak focus (LPCS=0.037, -0.056') better?
DIFFAMP* (34 GHz)
18 offset 0 in az 596
19 0.4 400
20 0.5 313
21 0.6 234
22 10 19
23 +0.5 in az, 10 minutes 292
(slope=36.90 counts/") 2008_01_31_19:03:13.fits = 2:03 PM EST
winds avg(sigma): 1.97(0.82) 1.66(0.50) 0.90(0.35)
24-28 peak/focus (LPCS = 0.051, -0.014') ok
DIFFAMP* (34 GHz)
Frank
29 offset 0 in el 600
30 0.4 402
31 0.5 368
32 0.6 258
33 10 19
34 +0.5 in el - 10 minutes 316
(slope=31.92 counts/") 2008_01_31_19:20:47.fits = 2:20 PM EST
winds avg(sigma): 2.96(0.88) 2.14(0.61) 1.22(0.55)
35-39 peak/focus (LPCs=0.092, -0.006')
DIFFAMP* (34 GHz)
40 offset 0 599
41 -0.4 in az 288
42 -0.5 in az 245
43 -0.6 248
44 -10 in az 18
45 -0.5 in az 20 min 117 (slope=8.88 counts/") )
winds avg(sigma): 3.49(1.14) 2.97(1.16) 0.91(0.73) 2008_01_31_19:40:44.fits = 2:40 PM EST
46-47 start another peak -- too long of a wait to process, starting over
48-52 peak/focus (LPCs = 0.111, 0.042)
DIFFAMP* (34 GHz)
53 offset 0 610
54 -0.4 in el 380
55 -0.5 in el 316
56 -0.6 in el 271
57 -10 in el 19
58 -0.5 in el 15 min 275 (slope=24.3 counts/") 2008_01_31_20:12:57.fits, = 3:12 PM EST
(ran into end of time)
winds avg(sigma): 3.56(1.02) 3.64(0.92) 1.12(0.74)
------------
* DIFFAMP -- this is the average difference, Beam1 minus Beam2 for
the 34.75 GHz channel, this being the closest to the
33 GHz that was used to calculate the FWHM.
This is the average after dropping the first 10 seconds of the scan.
** slope is simply calculated from the difference in the 0.6 and 0.4 FWHM offsets.
Use Brian's program "readccbotfnod.pro" to get the data.
Modified his program slightly to not object to the "Track" scan type.
Averaged the (Beam 1 - Beam 2) with minus (Beam 2 - Beam 1).
The four calibrations (+az, -az, +el, -el ) were fairly consistent
except for the -az in which, as one can see from the above lists,
the -0.4, -0.5, and -0.6 amplitudes were inconsistent with the other
calibrations. Whether this was due to the cloudy conditions or pointing error
in unclear.
Plots of the half power tracks used a slope of 30 counts/".
This is an average of the values listed above, ignoring the anomalous -az value.
- Scan 23 (+az) half-power track:
- Scan 34 (+el) half-power track:
- Scan 45 (-az) half-power track:
- Scan 58 (-el) half-power track:
These plots show the wind speeds in M/Sec during the 4 half-power scans.
One may note that there were some gusts up to 7 m/s in scan 45, which may explain
the anomalous calibration and the high rms pointing error.
- Wind speeds during Scan 23:
|
- Wind speeds during scan 34:
|
- Wind speeds during scan 45:
|
- Wind speeds during scan 58:
|
-- FrankGhigo - 31 Jan 2008
- suntrack.pdf: solar azimuth and elevation during the tilt scans
scan23hptrack.gif 
TPTCSPNT_080131.tar.gz 
suntrack.pdf 
