2022 Session I (c221)

EVN H-maser logs

For maser drift cf. gps logs on vlbeer, mar22, apr22 - most are offsets vs MJD. Automatic download and drift rate fitting with the evnGPS.py script.

Haystack Hs

In track C221C station Hs is to be correlated at Haystack. Bonn extracted data of scans 093-0015 093-0030 093-0045 093-0100 093-0115 and 093-0600 from stations EF, YS, OV, PT, KP, and e-transferred them 03may2022 to Haystack for processing there.

Pico Veleta

Krichbaum gathered Tsys and Log information into ftp://vlbeer.ira.inaf.it/vlb_arc/ftp/vlbi_arch/apr22/c221-pv-Logs.tgz

f221a: Lost completely due to bad weather (Snow, Wind)
c221a: A large fraction lost due to weather (Snow, Wind). Storm then passes and sky becomes clear, with low opacity tau225~0.15. Start recording at 12:00UTC. Done 11.3% of the schedule.
c221b: Done 100% under excellent weather
c221c: Done 100% with some fog and thin clouds, not affecting much the quality of the data.
c221d: Done first part with cloudy sky. Have to stop in scan no 0177 due to snow and wind. Done 66.3% of the schedule.
c221e: Bad weather keeps antenna stowed except for a window of ~1.5 hr when we can record with fog and some clouds. Done 23.7% of the schedule.

ATCA 86 GHz

Info from Cormac R. The ATCA data for Bonn are tracks A, C, E.

ATCA recordings are dual datastream 2-ch 2-bit with c221?_DAS1_*.lba files containing the first 64 MHz band (dual pol), and c221?_DAS1_*.lba the second 64 MHz band. Requires v2d format=LBASTD.

Filelists produced via DiFX chk_vlbi.py, e.g.,

ls -1 /data/c221a/atca/*.lba > atca_c221a.datafiles
chk_vlbi.py atca_c221a.datafiles > x
grep DAS1 x > at_das1.flist
grep DAS2 x > at_das2.flist

Reference antenna was on pad W102 (track A, C) and pad W45 (track E) according to DiFX Espresso atcapos.py for the VEX time ranges that AT was scheduled under tracks A/C/E. Using Espresso updatepos.py, and the env var STADB pointing to Sched 11.6 locations.dat, the corresponding VEX site coordinates are:

* W102 Tracks A and C
site_position =  -4751655.39672 m: 2791673.9797 m: -3200491.11339 m;
site_velocity =  -0.03099 m/yr: -0.00458 m/yr: 0.04203 m/yr;
site_position_epoch = 50449;

* W45 Track E
site_position =  -4752098.19972 m: 2790922.2537 m: -3200491.11339 m;
site_velocity =  -0.03099 m/yr: -0.00458 m/yr: 0.04203 m/yr;
site_position_epoch = 50449;

• https://www.atnf.csiro.au/vlbi/dokuwiki/doku.php/lbaops/lbamar2022/c221a
• https://www.atnf.csiro.au/vlbi/dokuwiki/doku.php/lbaops/lbaapr2022/c221c
• https://www.atnf.csiro.au/vlbi/dokuwiki/doku.php/lbaops/lbaapr2022/c221e

31-MAR-2022 11:24:05.500 phys_ref=10    NANT=9  REFERENCE=N13
31-MAR-2022 13:04:43.500 phys_ref=10    NANT=9  REFERENCE=N13
31-MAR-2022 13:29:55.500 phys_ref=5     NANT=10 REFERENCE=E10
05-APR-2022 06:56:11.000 phys_ref=5     NANT=10 REFERENCE=E10
ie
N13 from 31-MAR-2022 11:24:05.500 UT - 31-MAR-2022 13:04:43.500 UT, and
E10 from 31-MAR-2022 13:29:55.500 UT - 05-APR-2022 06:56:11.000 UT
ie
N13 4523926.095 468031.803 4460387.693   -0.000057  0.000936 5.906611  44.634693  2594.90290219896
E10 4524002.276 468122.784 4460301.456    0.000984 -0.000155 5.907653  44.633602  2594.9020534372