PAPER Polarimetry: Data Collection

Please note that the location observed by the antenna is centered on 38.4 degrees declination, and the right ascension (local sidereal time) is provided on the longer scans. See below for a summary of data runs...

Short Data Runs

OBS ID	START TIME (LST)	END TIME (LST)	GRAPH, CHAN A	GRAPH, CHAN B
DIAG_DATA_9AUG19_1	12:12:33	12:42:33	9AUG19_1A.png	9AUG19_1B.png
DIAG_DATA_9AUG19_2	12:45:22	13:15:22	9AUG19_2A.png	9AUG19_2B.png
DIAG_DATA_9AUG19_3	13:17:59	13:47:59	9AUG19_3A.png	9AUG19_3B.png
DIAG_DATA_9AUG19_4	13:50:36	14:20:36	9AUG19_4A.png	9AUG19_4B.png
DIAG_DATA_10AUG19_1	12:11:18	14:11:18	10AUG19_1A.png	10AUG19_1B.png
DIAG_DATA_11AUG19_1	12:11:36	14:11:36	11AUG19_1A.png	11AUG19_1B.png

*Note that integration times for scans on Aug. 9-11, 2019, were about 0.6 minutes long.

There seems to be a general increase in the antenna temperature levels later on in the observing sessions -- an increase of apparently 2-3 K, which seems to be consistent for all three nights.

24-Hour Data Runs

OBS ID	START TIME (LST)	OBS DURATION	GRAPH, CHAN A	GRAPH, CHAN B
DIAG_DATA_13AUG19_1	11:57:02	24 hrs	13AUG19_1A_LST.png	13AUG19_1B_LST.png
DIAG_DATA_16AUG19_1	13:01:44	24 hrs	16AUG19_1A.png	16AUG19_1B.png
DIAG_DATA_17AUG19_1	13:01:44	24 hrs	17AUG19_1A.png	17AUG19_1B.png
DIAG_DATA_19AUG19_1	15:29:55	24 hrs	19AUG19_AB.png
DIAG_DATA_20AUG19_1	13:01:44	24 hrs	20AUG19_A.png	20AUG19_B.png
DIAG_DATA_22AUG19_1	05:15:36	24 hrs	22AUG19_1A.png	22AUG19_1B.png
DIAG_DATA_24AUG19_1	06:28:27	24 hrs	24AUG19_1A.png	24AUG19_1B.png
DIAG_DATA_25AUG19_1	08:00:31	24 hrs	25AUG19_1A.png	25AUG19_1B.png
DIAG_DATA_28AUG19_1	14:00:42	24 hrs	28AUG19_1A.png	28AUG19_1B.png

*Integration times are approximately 3 mins.

Aug. 17, 2019 data

Note about Aug. 17 data: there is a mysterious signal starting around LST = 12:00:00, which looks to be RFI. Here are links to the averaged bandpass plots for both channels taken during this observation: 17AUG1A_bandpass.png and 17AUG1B_bandpass.png

It was determined that this was broadband RFI caused by lightning, which can also be seen in several other subsequent data runs.

Aug. 20, 2019 data

While most data sets' graphs are formed by averaging 100 adjacent FFT bins starting at 169.158 MHz, this piece of the spectrum contained narrowband RFI for the Aug. 20 data set. Thus, the Aug. 20 graphs are formed by averaging 100 adjacent FFT bins starting at 168.084 MHz.

-- EllieWhite - 2019-08-12