COVER INFORMATION Station: IRBENE (Code Ir ) Experiment: Tracing the Radio Outflows in RQ AGN from Pc- to Kpc-scales Exp. Code: EG131C Schedule Version: 1.00 Processed by SCHED version: 11.60 Release 11.6; April 2020 PI: Salmoli Ghosh Address: National Centre for Radio Astrophysics - TIFR S.P. Pune Univ. Campus, Ganeshkhind Pune India : 411007 Phone: (+91)020-25719000 EMAIL: salmoli.ghosh@gmail.com Fax: Phone during observation: (+91)8240982699/(+91)020-25719230 Observing mode: Phase-referencing continuum Notes: PCAL OFF Schedule for IRBENE (Code Ir ) Page 2 Tracing the Radio Outflows in RQ AGN from Pc- to Kpc-scales UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Tue 28 May 2024 Day 149 --- Next scan frequencies: 1626.49 1626.49 1626.49 1626.49 1690.49 1690.49 1690.49 1690.49 Next BBC frequencies: 276.49 276.49 276.49 276.49 340.49 340.49 340.49 340.49 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 09 30 00 3C84 03 23 06 74.0-178.8 0.0 0.8 0 0 09 30 00 09 35 00 --- 03 28 06 74.0-175.4 0.1 3.3 300 39 09 30 01 09 40 00 J0119+3210 03 33 07 56.2-124.0 2.2 31.7 272 39 09 40 00 09 46 00 =0116+319 03 39 08 55.5-122.1 2.3 32.5 360 85 09 40 01 09 46 00 MRK993 03 39 08 56.2-124.0 2.2 31.7 -4 85 No stop 09 49 30 --- 03 42 39 55.8-122.9 2.3 32.2 206 112 09 46 01 09 50 00 J0119+3210 03 43 09 55.1-120.8 2.4 33.0 26 112 09 50 00 09 51 00 =0116+319 03 44 09 55.0-120.5 2.4 33.1 60 120 09 50 01 09 51 00 MRK993 03 44 09 55.6-122.4 2.3 32.4 -4 120 No stop 09 54 30 --- 03 47 40 55.2-121.3 2.3 32.8 206 147 09 51 01 09 54 30 J0119+3210 03 47 40 54.6-119.5 2.4 33.6 -4 147 No stop 09 56 00 =0116+319 03 49 10 54.4-119.0 2.5 33.7 86 158 09 54 31 09 56 00 MRK993 03 49 10 55.0-120.9 2.4 33.0 -4 158 No stop 09 59 30 --- 03 52 40 54.6-119.8 2.4 33.4 206 185 09 56 01 10 00 00 J0119+3210 03 53 11 53.9-117.8 2.5 34.2 26 185 10 00 00 10 01 00 =0116+319 03 54 11 53.8-117.5 2.6 34.3 60 193 10 00 01 10 01 00 MRK993 03 54 11 54.4-119.3 2.5 33.6 -4 193 No stop 10 04 30 --- 03 57 41 54.0-118.3 2.5 34.0 206 220 10 01 01 10 04 30 J0119+3210 03 57 41 53.4-116.5 2.6 34.6 -4 220 No stop 10 06 00 =0116+319 03 59 12 53.2-116.0 2.6 34.8 86 232 10 04 31 10 06 00 MRK993 03 59 12 53.9-117.8 2.5 34.1 -4 232 No stop 10 09 30 --- 04 02 42 53.4-116.8 2.6 34.5 206 259 10 06 01 10 10 00 J0119+3210 04 03 12 52.7-114.9 2.7 35.2 26 259 10 10 00 10 11 00 =0116+319 04 04 12 52.6-114.6 2.7 35.2 60 267 10 10 01 10 11 00 MRK993 04 04 12 53.3-116.4 2.6 34.6 -4 267 No stop 10 14 30 --- 04 07 43 52.8-115.3 2.7 35.0 206 294 10 11 01 10 14 30 J0119+3210 04 07 43 52.1-113.6 2.8 35.6 -4 294 No stop 10 16 00 =0116+319 04 09 13 52.0-113.2 2.8 35.7 86 305 10 14 31 Schedule for IRBENE (Code Ir ) Page 3 Tracing the Radio Outflows in RQ AGN from Pc- to Kpc-scales UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Tue 28 May 2024 Day 149 --- 10 16 00 MRK993 04 09 13 52.7-114.9 2.7 35.1 -4 305 No stop 10 19 30 --- 04 12 44 52.2-113.9 2.8 35.4 206 332 10 16 01 10 20 00 J0119+3210 04 13 14 51.5-112.1 2.9 36.0 26 332 10 20 00 10 21 00 =0116+319 04 14 14 51.3-111.8 2.9 36.1 60 340 10 20 01 10 21 00 MRK993 04 14 14 52.0-113.5 2.8 35.6 -4 340 No stop 10 24 30 --- 04 17 45 51.6-112.5 2.8 35.9 206 367 10 21 01 10 24 30 J0119+3210 04 17 45 50.9-110.9 2.9 36.4 -4 367 No stop 10 26 00 =0116+319 04 19 15 50.7-110.5 3.0 36.5 86 379 10 24 31 10 26 00 MRK993 04 19 15 51.4-112.1 2.9 36.0 -4 379 No stop 10 29 30 --- 04 22 45 51.0-111.2 2.9 36.3 206 406 10 26 01 10 30 00 J0119+3210 04 23 15 50.2-109.4 3.0 36.8 26 406 10 30 00 10 31 00 =0116+319 04 24 16 50.1-109.1 3.1 36.9 60 414 10 30 01 10 31 00 MRK993 04 24 16 50.8-110.8 3.0 36.4 -4 414 No stop 10 34 30 --- 04 27 46 50.4-109.8 3.0 36.6 206 441 10 31 01 10 34 30 J0119+3210 04 27 46 49.6-108.2 3.1 37.1 -4 441 No stop 10 36 00 =0116+319 04 29 16 49.4-107.8 3.1 37.2 86 452 10 34 31 10 36 00 MRK993 04 29 16 50.2-109.4 3.0 36.8 -4 452 No stop 10 39 30 --- 04 32 47 49.7-108.5 3.1 37.0 206 479 10 36 01 10 40 00 J0119+3210 04 33 17 48.9-106.8 3.2 37.4 26 479 10 40 00 10 41 00 =0116+319 04 34 17 48.8-106.5 3.2 37.5 60 487 10 40 01 10 41 00 MRK993 04 34 17 49.5-108.1 3.1 37.1 -4 487 No stop 10 44 30 --- 04 37 48 49.1-107.2 3.2 37.3 206 514 10 41 01 10 44 30 J0119+3210 04 37 48 48.3-105.6 3.3 37.7 -4 514 No stop 10 46 00 =0116+319 04 39 18 48.2-105.3 3.3 37.8 86 526 10 44 31 10 46 00 MRK993 04 39 18 48.9-106.8 3.2 37.4 -4 526 No stop 10 49 30 --- 04 42 49 48.4-105.9 3.3 37.6 206 553 10 46 01 10 50 00 J0119+3210 04 43 19 47.6-104.3 3.4 38.0 26 553 10 50 00 10 51 00 =0116+319 04 44 19 47.5-104.0 3.4 38.0 60 560 10 50 01 10 51 00 MRK993 04 44 19 48.2-105.5 3.3 37.7 -4 560 No stop 10 54 30 --- 04 47 49 47.8-104.7 3.3 37.9 206 587 10 51 01 Schedule for IRBENE (Code Ir ) Page 4 Tracing the Radio Outflows in RQ AGN from Pc- to Kpc-scales UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Tue 28 May 2024 Day 149 --- 10 54 30 J0119+3210 04 47 49 47.0-103.2 3.4 38.2 -4 587 No stop 10 56 00 =0116+319 04 49 20 46.8-102.8 3.5 38.2 86 599 10 54 31 10 56 00 MRK993 04 49 20 47.6-104.3 3.4 37.9 -4 599 No stop 10 59 30 --- 04 52 50 47.1-103.4 3.4 38.1 206 626 10 56 01 11 00 00 J0119+3210 04 53 20 46.3-101.8 3.5 38.4 26 626 11 00 00 11 01 00 =0116+319 04 54 21 46.2-101.6 3.6 38.5 60 634 11 00 01 11 01 00 MRK993 04 54 21 46.9-103.1 3.5 38.2 -4 634 No stop 11 04 30 --- 04 57 51 46.5-102.2 3.5 38.3 206 661 11 01 01 11 04 30 J0119+3210 04 57 51 45.7-100.7 3.6 38.6 -4 661 No stop 11 06 00 =0116+319 04 59 21 45.5-100.4 3.6 38.6 86 672 11 04 31 11 06 00 MRK993 04 59 21 46.3-101.8 3.5 38.4 -4 672 No stop 11 09 30 --- 05 02 52 45.8-101.0 3.6 38.5 206 699 11 06 01 11 10 00 J0119+3210 05 03 22 45.0 -99.5 3.7 38.8 26 699 11 10 00 11 11 00 =0116+319 05 04 22 44.9 -99.2 3.7 38.8 60 707 11 10 01 11 11 00 MRK993 05 04 22 45.6-100.7 3.6 38.6 -4 707 No stop 11 14 30 --- 05 07 53 45.2 -99.8 3.7 38.7 206 734 11 11 01 11 14 30 J0119+3210 05 07 53 44.4 -98.4 3.8 38.9 -4 734 No stop 11 16 00 =0116+319 05 09 23 44.2 -98.1 3.8 38.9 86 746 11 14 31 11 16 00 MRK993 05 09 23 45.0 -99.5 3.7 38.7 -4 746 No stop 11 19 30 --- 05 12 54 44.5 -98.7 3.8 38.8 206 773 11 16 01 11 20 00 J0119+3210 05 13 24 43.7 -97.1 3.9 39.0 26 773 11 20 00 11 21 00 =0116+319 05 14 24 43.5 -96.9 3.9 39.1 60 781 11 20 01 11 21 00 MRK993 05 14 24 44.3 -98.3 3.8 38.9 -4 781 No stop 11 24 30 --- 05 17 54 43.8 -97.5 3.9 39.0 206 808 11 21 01 11 24 30 J0119+3210 05 17 54 43.1 -96.1 3.9 39.1 -4 808 No stop 11 26 00 =0116+319 05 19 25 42.9 -95.8 4.0 39.2 86 819 11 24 31 11 26 00 MRK993 05 19 25 43.6 -97.2 3.9 39.0 -4 819 No stop 11 29 30 --- 05 22 55 43.2 -96.4 3.9 39.1 206 846 11 26 01 11 30 00 J0119+3210 05 23 25 42.3 -94.9 4.0 39.2 26 846 11 30 00 11 31 00 =0116+319 05 24 25 42.2 -94.7 4.1 39.2 60 854 11 30 01 Schedule for IRBENE (Code Ir ) Page 5 Tracing the Radio Outflows in RQ AGN from Pc- to Kpc-scales UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Tue 28 May 2024 Day 149 --- 11 31 00 MRK993 05 24 25 43.0 -96.0 4.0 39.1 -4 854 No stop 11 34 30 --- 05 27 56 42.5 -95.3 4.0 39.2 206 881 11 31 01 11 34 30 J0119+3210 05 27 56 41.7 -93.9 4.1 39.3 -4 881 No stop 11 36 00 =0116+319 05 29 26 41.5 -93.6 4.1 39.3 86 893 11 34 31 11 36 00 MRK993 05 29 26 42.3 -94.9 4.0 39.2 -4 893 No stop 11 39 30 --- 05 32 57 41.8 -94.2 4.1 39.3 206 920 11 36 01 11 40 00 J0119+3210 05 33 27 41.0 -92.7 4.2 39.4 26 920 11 40 00 11 41 00 =0116+319 05 34 27 40.9 -92.5 4.2 39.4 60 927 11 40 01 11 41 00 MRK993 05 34 27 41.6 -93.8 4.1 39.3 -4 927 No stop 11 44 30 --- 05 37 58 41.1 -93.1 4.2 39.3 206 955 11 41 01 11 44 30 J0119+3210 05 37 58 40.4 -91.7 4.3 39.4 -4 955 No stop 11 46 00 =0116+319 05 39 28 40.2 -91.4 4.3 39.4 86 966 11 44 31 11 46 00 MRK993 05 39 28 40.9 -92.7 4.2 39.3 -4 966 No stop 11 49 30 --- 05 42 59 40.5 -92.0 4.3 39.4 206 993 11 46 01 11 50 00 J0119+3210 05 43 29 39.6 -90.6 4.4 39.4 26 993 11 50 00 11 51 00 =0116+319 05 44 29 39.5 -90.3 4.4 39.4 60 1001 11 50 01 11 51 00 MRK993 05 44 29 40.3 -91.6 4.3 39.4 -4 1001 No stop 11 54 30 --- 05 47 59 39.8 -90.9 4.4 39.4 206 1028 11 51 01 11 54 30 J0119+3210 05 47 59 39.0 -89.6 4.5 39.4 -4 1028 No stop 11 56 00 =0116+319 05 49 30 38.8 -89.3 4.5 39.4 86 1040 11 54 31 11 56 00 MRK993 05 49 30 39.6 -90.6 4.4 39.4 -4 1040 No stop 11 59 30 --- 05 53 00 39.1 -89.8 4.4 39.4 206 1067 11 56 01 12 00 00 J0119+3210 05 53 30 38.3 -88.5 4.5 39.4 26 1067 12 00 00 12 01 00 =0116+319 05 54 30 38.2 -88.2 4.6 39.4 60 1074 12 00 01 12 01 00 MRK993 05 54 30 38.9 -89.5 4.5 39.4 -4 1074 No stop 12 04 30 --- 05 58 01 38.5 -88.8 4.5 39.4 206 1101 12 01 01 12 04 30 J0119+3210 05 58 01 37.7 -87.5 4.6 39.4 -4 1101 No stop 12 06 00 =0116+319 05 59 31 37.5 -87.2 4.6 39.3 86 1113 12 04 31 12 06 00 MRK993 05 59 31 38.3 -88.5 4.5 39.4 -4 1113 No stop 12 09 30 --- 06 03 02 37.8 -87.7 4.6 39.3 206 1140 12 06 01 Schedule for IRBENE (Code Ir ) Page 6 Tracing the Radio Outflows in RQ AGN from Pc- to Kpc-scales UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Tue 28 May 2024 Day 149 --- 12 10 00 J0119+3210 06 03 32 37.0 -86.4 4.7 39.3 26 1140 12 10 00 12 11 00 =0116+319 06 04 32 36.8 -86.2 4.7 39.3 60 1148 12 10 01 12 11 00 MRK993 06 04 32 37.6 -87.4 4.6 39.3 -4 1148 No stop 12 14 30 --- 06 08 03 37.1 -86.7 4.7 39.3 206 1175 12 11 01 12 14 30 J0119+3210 06 08 03 36.4 -85.5 4.8 39.3 -4 1175 No stop 12 16 00 =0116+319 06 09 33 36.2 -85.2 4.8 39.2 86 1186 12 14 31 12 16 00 MRK993 06 09 33 36.9 -86.4 4.7 39.3 -4 1186 No stop 12 19 30 --- 06 13 03 36.4 -85.7 4.8 39.2 206 1213 12 16 01 12 20 00 J0119+3210 06 13 34 35.6 -84.3 4.9 39.2 26 1213 12 20 00 12 21 00 =0116+319 06 14 34 35.5 -84.1 4.9 39.2 60 1221 12 20 01 12 21 00 MRK993 06 14 34 36.2 -85.4 4.8 39.2 -4 1221 No stop 12 24 30 --- 06 18 04 35.8 -84.7 4.9 39.2 206 1248 12 21 01 12 24 30 J0119+3210 06 18 04 35.0 -83.4 5.0 39.1 -4 1248 No stop 12 26 00 =0116+319 06 19 35 34.8 -83.1 5.0 39.1 86 1260 12 24 31 12 26 00 MRK993 06 19 35 35.6 -84.4 4.9 39.2 -4 1260 No stop 12 29 30 --- 06 23 05 35.1 -83.7 4.9 39.1 206 1287 12 26 01 12 30 00 J0119+3210 06 23 35 34.3 -82.3 5.0 39.0 26 1287 12 30 00 12 31 00 =0116+319 06 24 35 34.1 -82.1 5.1 39.0 60 1295 12 30 01 12 31 00 MRK993 06 24 35 34.9 -83.4 5.0 39.1 -4 1295 No stop 12 34 30 --- 06 28 06 34.4 -82.7 5.0 39.0 206 1322 12 31 01 12 34 30 J0119+3210 06 28 06 33.7 -81.4 5.1 38.9 -4 1322 No stop 12 36 00 =0116+319 06 29 36 33.5 -81.1 5.1 38.8 86 1333 12 34 31 12 36 00 MRK993 06 29 36 34.2 -82.4 5.0 39.0 -4 1333 No stop 12 39 30 --- 06 33 07 33.8 -81.7 5.1 38.9 206 1360 12 36 01 12 40 00 J0119+3210 06 33 37 33.0 -80.4 5.2 38.7 26 1360 12 40 00 12 41 00 =0116+319 06 34 37 32.8 -80.2 5.2 38.7 60 1368 12 40 01 12 41 00 MRK993 06 34 37 33.6 -81.4 5.1 38.8 -4 1368 No stop 12 44 30 --- 06 38 08 33.1 -80.7 5.2 38.8 206 1395 12 41 01 12 44 30 J0119+3210 06 38 08 32.4 -79.5 5.3 38.6 -4 1395 No stop 12 46 00 =0116+319 06 39 38 32.2 -79.2 5.3 38.6 86 1407 12 44 31 Schedule for IRBENE (Code Ir ) Page 7 Tracing the Radio Outflows in RQ AGN from Pc- to Kpc-scales UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Tue 28 May 2024 Day 149 --- 12 52 00 4C39.25 06 45 39 57.8-252.5 -2.7 -41.1 270 1407 12 52 00 12 59 00 --- 06 52 40 58.7-250.5 -2.6 -40.6 420 1461 12 52 01 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess224.L1024 --- WARNING --- This group does not match an entry in the frequency catalog. This might be ok because the catalog is not complete. But be very careful to be sure that the setup is correct. Setup group: 9 Station: IRBENE Total bit rate: 1024 Format: VDIF Bits per sample: 2 Sample rate: 64.000 Number of channels: 8 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 1350.00 1350.00 1350.00 1350.00 1350.00 1350.00 1350.00 1350.00 Net SB= L L U U L L U U IF SB = U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 9 1 9 2 10 2 10 BBC SB= L L U U L L U U IF = A2 C2 A2 C2 A2 C2 A2 C2 The following frequency sets based on these setups were used. Frequency Set: 8 Setup file default. Used with PCAL = off LO sum= 1626.49 1626.49 1626.49 1626.49 1690.49 1690.49 1690.49 1690.49 BBC fr= 276.49 276.49 276.49 276.49 340.49 340.49 340.49 340.49 Bandwd= 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 Matching frequency sets: 8 Track assignments are: track1= 1, 2, 3, 4, 5, 6, 7, 8 barrel=roll_off POSITIONS OF SOURCES USED IN RECORDING SCANS Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * MRK993 01 22 42.704718 * 01 25 31.450000 01 26 52.333710 0.00 31 52 35.16789 * 32 08 10.40000 32 15 36.32444 0.00 From catalog imbedded in main SCHED input file. 0116+319 01 16 47.247876 * 01 19 35.003417 01 20 55.429157 2.97 * J0119+3210 31 55 05.83110 * 32 10 50.05658 32 18 20.07207 2.37 J0119+32 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.gsfc GSFC 2016a X/S astro solution, 24 observations. * 3C84 03 16 29.567265 * 03 19 48.160096 03 21 23.034413 1.50 J0319+4130 41 19 51.91692 * 41 30 42.10404 41 35 54.34559 2.86 0316+413 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.gsfc J0319+41 GSFC 2016a X/S astro solution, 10291 observations. * 4C39.25 09 23 55.319216 * 09 27 03.013937 09 28 33.866253 0.31 J0927+3902 39 15 23.56644 * 39 02 20.85185 38 56 11.84344 0.16 0923+392 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.gsfc J0927+39 GSFC 2016a X/S astro solution, 250526 observations. SOURCE SCAN SUMMARY FOR SOURCES LISTED ABOVE Scan hours are for recording scans only. Baseline hours are only counted for scans above horizon at both ends. Source Setup file Frequency sets Observing hours (duplicates not shown) Scan Baseline MRK993 sess224.L1024 1 2 3 4 5 6 7 8 9 10 2.100 155.745 J0119+3210 sess224.L1024 1 2 3 4 5 6 7 8 9 10 0.850 56.611 3C84 sess224.L1024 1 2 3 4 5 6 7 8 9 10 0.083 7.583 4C39.25 sess224.L1024 1 2 3 4 5 6 7 8 9 10 0.117 6.284 EFFECT OF SOLAR CORONA The solar corona can cause unstable phases for sources too close to the Sun. SCHED provides warnings at individual scans for distances less than 10 degrees. The distance from the Sun to each source in this schedule is: Source Sun distance (deg) MRK993 40.5 J0119+3210 41.7 3C84 23.9 4C39.25 66.3 Barry Clark estimates from predictions by Ketan Desai of IPM scattering sizes that the Sun will cause amplitude reductions on the longest VLBA baselines at a solar distance of 60deg F^(-0.6) where F is in GHz. For common VLBI bands, this is: 327 MHz 117. deg 610 MHz 81. deg 1.6 GHz 45. deg 2.3 GHz 36. deg 5.0 GHz 23. deg 8.4 GHz 17. deg 15.0 GHz 12. deg 22.0 GHz 9. deg 43.0 GHz 6. deg