Comparison of 160 GHz and 80 GHz maps (2003 - 2004)

To check whether changes of the surface are seen both in 80 and 160 GHz maps, I have selected seven sets of 80 and 160 GHz maps which were made subsequently on the same day. The maps are listed in the following table. Adjustments of the dish have been made in between some sets of maps.

Date	Freq	Time	Freq	Time
20030118	80	235710	160	004817
adjustments 20030211 and 20030305
20030409	80	022221	160	032446
adjustments 20030514 and 20030730
20031222	80	014018	160	023408
20040424	80	224519	160	233514
adjustment 20040524
20040616	80	224347	160	233344
20040808	80	224129	160	234534
20040909	80	015400	160	024418

Then difference maps were obtained between the maps made on these six days - 15 sets of maps. The rms of the difference maps is given in the following table.

Map	rms 160	rms 80
20030409-20030118	15.2	16.2
20031222-20030118	23.3	24.3
20040424-20030118	21.0	21.5
20040616-20030118	21.1	27.6
20040808-20030118	20.1	19.8
20040909-20030118	18.6	18.0
20031222-20030409	20.0	20.3
20040424-20030409	19.7	18.4
20040616-20030409	16.2	27.0
20040808-20030409	15.6	14.3
20040909-20030409	15.7	15.1
20040424-20031222	21.8	18.4
20040616-20031222	21.8	29.2
20040808-20031222	21.2	21.4
20040909-20031222	20.5	21.9
20040616-20040424	20.4	30.3
20040808-20040424	21.6	18.5
20040909-20040424	22.0	22.4
20040808-20040616	10.5	24.6
20040909-20040616	15.3	21.7
20040909-20040808	12.0	11.5

Difference between two 160 GHz maps (left) and two 80 GHz maps (right) - make window wide enough:
The agreement between both sets of maps is quite good on most days. Only using the 80 GHz map on 16 June 2004, there are large deviations. This suggests that in between 80 (usually made first) and 160 GHz maps there is little change in the surface.

20030409-20030118

20031222-20030118

20040424-20030118

20040616-20030118

20040808-20030118

20040909-20030118

20031222-20030409

20040424-20030409

20040616-20030409

20040808-20030409

20040909-20030409

20040424-20031222

20040616-20031222

20040808-20031222

20040909-20031222

20040616-20040424

20040808-20040424

20040909-20040424

20040808-20040616

20040909-20040616

20040909-20040808