COVER INFORMATION Station: ONSALA85 (Code O8 ) Experiment: Exploring the jet in a z > 6 blazar DES J0322-18 Exp. Code: EL064B Schedule Version: 4.00 Processed by SCHED version: 11.60 Release 11.6; April 2020 PI: Tao An Address: Shanghai Astronomical Observatory 80th Nandan Road, Xuhui District Shanghai 200030 China Phone: +86-13261603255 EMAIL: antao@shao.ac.cn Fax: Phone during observation: Observing mode: VLBI Notes: # Please, make sure PHASE CAL is OFF # 1.4 GHz, dual polarisation, 1024 Mbps eVLBI, 6 hours at GST: J0322-18 Drafted by Yuanqi Liu Schedule for ONSALA85 (Code O8 ) Page 2 Exploring the jet in a z > 6 blazar DES J0322-18 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 ---------------------------------------------------------------------------------------- --- Thu 3 Nov 2022 Day 307 --- Next scan frequencies: 1626.49 1626.49 1626.49 1626.49 1690.49 1690.49 1690.49 1690.49 Next BBC frequencies: 896.49 896.49 896.49 896.49 960.49 960.49 960.49 960.49 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 19 00 00 J0006-0623 22 39 45 23.9 156.1 -1.5 0.0 0 0 19 00 00 19 05 00 =0003-066 22 44 46 24.2 157.4 -1.4 0.0 300 39 19 00 01 21 31 00 P0327-1803 01 11 09 9.4 147.0 -2.3 0.0 8580 39 21 31 00 21 32 00 --- 01 12 10 9.4 147.2 -2.3 0.0 60 46 21 31 01 21 32 00 J0322-18 01 12 10 9.2 148.7 -2.2 0.0 -14 46 No stop 21 36 00 --- 01 16 10 9.5 149.6 -2.1 0.0 226 77 21 32 01 21 36 00 P0327-1803 01 16 10 9.7 148.1 -2.2 0.0 -14 77 No stop 21 37 30 --- 01 17 41 9.8 148.5 -2.2 0.0 76 89 21 36 01 21 37 30 J0322-18 01 17 41 9.6 149.9 -2.1 0.0 -14 89 No stop 21 41 30 --- 01 21 41 9.9 150.9 -2.0 0.0 226 120 21 37 31 21 42 00 P0327-1803 01 22 11 10.2 149.5 -2.1 0.0 16 120 21 42 00 21 43 00 --- 01 23 11 10.2 149.8 -2.1 0.0 60 128 21 42 01 21 43 00 J0322-18 01 23 11 10.0 151.2 -2.0 0.0 -14 128 No stop 21 47 00 --- 01 27 12 10.2 152.1 -1.9 0.0 226 158 21 43 01 21 47 00 P0327-1803 01 27 12 10.5 150.7 -2.0 0.0 -14 158 No stop 21 48 30 --- 01 28 42 10.6 151.0 -2.0 0.0 76 170 21 47 01 21 48 30 J0322-18 01 28 42 10.3 152.5 -1.9 0.0 -14 170 No stop 21 52 30 --- 01 32 43 10.6 153.4 -1.8 0.0 226 201 21 48 31 21 53 00 P0327-1803 01 33 13 10.9 152.1 -1.9 0.0 16 201 21 53 00 21 54 00 --- 01 34 13 10.9 152.3 -1.9 0.0 60 209 21 53 01 21 54 00 J0322-18 01 34 13 10.7 153.8 -1.8 0.0 -14 209 No stop 21 58 00 --- 01 38 14 10.9 154.7 -1.8 0.0 226 240 21 54 01 21 58 00 P0327-1803 01 38 14 11.2 153.3 -1.8 0.0 -14 240 No stop 21 59 30 --- 01 39 44 11.3 153.6 -1.8 0.0 76 251 21 58 01 21 59 30 J0322-18 01 39 44 11.0 155.1 -1.7 0.0 -14 251 No stop 22 03 30 --- 01 43 45 11.2 156.0 -1.7 0.0 226 282 21 59 31 22 04 00 P0327-1803 01 44 15 11.5 154.7 -1.7 0.0 16 282 22 04 00 22 05 00 --- 01 45 15 11.6 154.9 -1.7 0.0 60 290 22 04 01 Schedule for ONSALA85 (Code O8 ) Page 3 Exploring the jet in a z > 6 blazar DES J0322-18 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 ---------------------------------------------------------------------------------------- --- Thu 3 Nov 2022 Day 307 --- 22 05 00 J0322-18 01 45 15 11.3 156.4 -1.6 0.0 -14 290 No stop 22 09 00 --- 01 49 16 11.5 157.3 -1.6 0.0 226 321 22 05 01 22 09 00 P0327-1803 01 49 16 11.8 155.9 -1.7 0.0 -14 321 No stop 22 10 30 --- 01 50 46 11.9 156.2 -1.6 0.0 76 332 22 09 01 22 10 30 J0322-18 01 50 46 11.6 157.7 -1.5 0.0 -14 332 No stop 22 14 30 --- 01 54 47 11.8 158.6 -1.5 0.0 226 363 22 10 31 22 15 00 P0327-1803 01 55 17 12.1 157.3 -1.6 0.0 16 363 22 15 00 22 16 00 --- 01 56 17 12.2 157.5 -1.5 0.0 60 371 22 15 01 22 16 00 J0322-18 01 56 17 11.9 159.0 -1.5 0.0 -14 371 No stop 22 20 00 --- 02 00 18 12.1 159.9 -1.4 0.0 226 402 22 16 01 22 20 00 P0327-1803 02 00 18 12.4 158.5 -1.5 0.0 -14 402 No stop 22 21 30 --- 02 01 48 12.5 158.8 -1.4 0.0 76 414 22 20 01 22 21 30 J0322-18 02 01 48 12.1 160.3 -1.4 0.0 -14 414 No stop 22 25 30 --- 02 05 48 12.3 161.2 -1.3 0.0 226 444 22 21 31 22 26 00 P0327-1803 02 06 19 12.7 159.9 -1.4 0.0 16 444 22 26 00 22 27 00 --- 02 07 19 12.7 160.2 -1.4 0.0 60 452 22 26 01 22 27 00 J0322-18 02 07 19 12.4 161.6 -1.3 0.0 -14 452 No stop 22 31 00 --- 02 11 19 12.5 162.5 -1.2 0.0 226 483 22 27 01 22 31 00 P0327-1803 02 11 19 12.9 161.1 -1.3 0.0 -14 483 No stop 22 32 30 --- 02 12 50 13.0 161.5 -1.3 0.0 76 495 22 31 01 22 32 30 J0322-18 02 12 50 12.6 162.9 -1.2 0.0 -14 495 No stop 22 36 30 --- 02 16 50 12.7 163.9 -1.1 0.0 226 526 22 32 31 22 37 00 P0327-1803 02 17 20 13.2 162.6 -1.2 0.0 16 526 22 37 00 22 38 00 --- 02 18 21 13.2 162.8 -1.2 0.0 60 533 22 37 01 22 38 00 J0322-18 02 18 21 12.8 164.2 -1.1 0.0 -14 533 No stop 22 42 00 --- 02 22 21 12.9 165.2 -1.0 0.0 226 564 22 38 01 22 42 00 P0327-1803 02 22 21 13.4 163.8 -1.1 0.0 -14 564 No stop 22 43 30 --- 02 23 51 13.4 164.1 -1.1 0.0 76 576 22 42 01 22 43 30 J0322-18 02 23 51 13.0 165.6 -1.0 0.0 -14 576 No stop 22 47 30 --- 02 27 52 13.1 166.5 -0.9 0.0 226 607 22 43 31 Schedule for ONSALA85 (Code O8 ) Page 4 Exploring the jet in a z > 6 blazar DES J0322-18 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 ---------------------------------------------------------------------------------------- --- Thu 3 Nov 2022 Day 307 --- 22 48 00 P0327-1803 02 28 22 13.6 165.2 -1.0 0.0 16 607 22 48 00 22 49 00 --- 02 29 22 13.6 165.5 -1.0 0.0 60 614 22 48 01 22 49 00 J0237+2848 02 29 22 61.5 175.5 -0.2 0.0 -201 614 No stop 22 54 00 =0234+285 02 34 23 61.5 177.8 -0.1 0.0 99 653 22 49 01 22 54 30 P0327-1803 02 34 53 13.8 166.8 -0.9 0.0 -171 653 22 54 30 22 58 30 --- 02 38 54 13.9 167.8 -0.8 0.0 69 684 22 54 31 22 58 30 J0322-18 02 38 54 13.4 169.2 -0.7 0.0 -14 684 No stop 23 02 30 --- 02 42 55 13.5 170.2 -0.7 0.0 226 715 22 58 31 23 02 30 P0327-1803 02 42 55 14.0 168.8 -0.8 0.0 -14 715 No stop 23 04 00 --- 02 44 25 14.1 169.1 -0.7 0.0 76 727 23 02 31 23 04 00 J0322-18 02 44 25 13.6 170.5 -0.6 0.0 -14 727 No stop 23 08 00 --- 02 48 25 13.7 171.5 -0.6 0.0 226 757 23 04 01 23 08 30 P0327-1803 02 48 56 14.2 170.2 -0.7 0.0 16 757 23 08 30 23 09 30 --- 02 49 56 14.2 170.5 -0.6 0.0 60 765 23 08 31 23 09 30 J0322-18 02 49 56 13.7 171.9 -0.6 0.0 -14 765 No stop 23 13 30 --- 02 53 56 13.8 172.8 -0.5 0.0 226 796 23 09 31 23 13 30 P0327-1803 02 53 56 14.3 171.5 -0.6 0.0 -14 796 No stop 23 15 00 --- 02 55 27 14.3 171.8 -0.6 0.0 76 808 23 13 31 23 15 00 J0322-18 02 55 27 13.8 173.2 -0.5 0.0 -14 808 No stop 23 19 00 --- 02 59 27 13.8 174.2 -0.4 0.0 226 839 23 15 01 23 19 30 P0327-1803 02 59 57 14.4 172.9 -0.5 0.0 16 839 23 19 30 23 20 30 --- 03 00 57 14.4 173.2 -0.5 0.0 60 846 23 19 31 23 20 30 J0322-18 03 00 57 13.9 174.5 -0.4 0.0 -14 846 No stop 23 24 30 --- 03 04 58 13.9 175.5 -0.3 0.0 226 877 23 20 31 23 24 30 P0327-1803 03 04 58 14.5 174.2 -0.4 0.0 -14 877 No stop 23 26 00 --- 03 06 28 14.5 174.5 -0.4 0.0 76 889 23 24 31 23 26 00 J0322-18 03 06 28 13.9 175.9 -0.3 0.0 -14 889 No stop 23 30 00 --- 03 10 29 14.0 176.9 -0.2 0.0 226 920 23 26 01 23 30 30 P0327-1803 03 10 59 14.5 175.6 -0.3 0.0 16 920 23 30 30 23 31 30 --- 03 11 59 14.5 175.9 -0.3 0.0 60 927 23 30 31 Schedule for ONSALA85 (Code O8 ) Page 5 Exploring the jet in a z > 6 blazar DES J0322-18 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 ---------------------------------------------------------------------------------------- --- Thu 3 Nov 2022 Day 307 --- 23 31 30 J0322-18 03 11 59 14.0 177.2 -0.2 0.0 -14 927 No stop 23 35 30 --- 03 16 00 14.0 178.2 -0.1 0.0 226 958 23 31 31 23 35 30 P0327-1803 03 16 00 14.6 176.9 -0.2 0.0 -14 958 No stop 23 37 00 --- 03 17 30 14.6 177.2 -0.2 0.0 76 970 23 35 31 23 37 00 J0322-18 03 17 30 14.0 178.6 -0.1 0.0 -14 970 No stop 23 41 00 --- 03 21 31 14.0 179.6 -0.0 0.0 226 1001 23 37 01 23 41 30 P0327-1803 03 22 01 14.6 178.3 -0.1 0.0 16 1001 23 41 30 23 42 30 --- 03 23 01 14.6 178.6 -0.1 0.0 60 1009 23 41 31 23 42 30 J0322-18 03 23 01 14.0 179.9 -0.0 0.0 -14 1009 No stop 23 46 30 --- 03 27 02 14.0 180.9 0.1 0.0 226 1040 23 42 31 23 46 30 P0327-1803 03 27 02 14.6 179.6 -0.0 0.0 -14 1040 No stop 23 48 00 --- 03 28 32 14.6 179.9 -0.0 0.0 76 1051 23 46 31 23 48 00 J0322-18 03 28 32 14.0 181.3 0.1 0.0 -14 1051 No stop 23 52 00 --- 03 32 33 14.0 182.3 0.2 0.0 226 1082 23 48 01 23 52 30 P0327-1803 03 33 03 14.6 181.0 0.1 0.0 16 1082 23 52 30 23 53 30 --- 03 34 03 14.6 181.3 0.1 0.0 60 1090 23 52 31 23 53 30 J0322-18 03 34 03 14.0 182.6 0.2 0.0 -14 1090 No stop 23 57 30 --- 03 38 04 13.9 183.6 0.2 0.0 226 1121 23 53 31 23 57 30 P0327-1803 03 38 04 14.6 182.3 0.2 0.0 -14 1121 No stop 23 59 00 --- 03 39 34 14.6 182.7 0.2 0.0 76 1132 23 57 31 --- Start: Thu 3 Nov 2022 Day 307 -- Stop: Fri 4 Nov 2022 Day 308 --- 23 59 00 J0322-18 03 39 34 13.9 184.0 0.3 0.0 -14 1132 No stop 00 03 00 --- 03 43 34 13.9 184.9 0.3 0.0 226 1163 23 59 01 00 03 30 P0327-1803 03 44 05 14.6 183.8 0.3 0.0 16 1163 00 03 30 00 04 30 --- 03 45 05 14.5 184.0 0.3 0.0 60 1171 00 03 31 00 04 30 J0322-18 03 45 05 13.9 185.3 0.4 0.0 -14 1171 No stop 00 08 30 --- 03 49 05 13.8 186.3 0.4 0.0 226 1202 00 04 31 00 08 30 P0327-1803 03 49 05 14.5 185.0 0.3 0.0 -14 1202 No stop 00 10 00 --- 03 50 36 14.5 185.4 0.4 0.0 76 1213 00 08 31 Schedule for ONSALA85 (Code O8 ) Page 6 Exploring the jet in a z > 6 blazar DES J0322-18 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 ---------------------------------------------------------------------------------------- --- Fri 4 Nov 2022 Day 308 --- 00 10 00 J0322-18 03 50 36 13.8 186.7 0.5 0.0 -14 1213 No stop 00 14 00 --- 03 54 36 13.7 187.6 0.5 0.0 226 1244 00 10 01 00 14 30 P0327-1803 03 55 06 14.4 186.5 0.4 0.0 16 1244 00 14 30 00 15 30 --- 03 56 07 14.4 186.7 0.5 0.0 60 1252 00 14 31 00 15 30 J0322-18 03 56 07 13.7 188.0 0.5 0.0 -14 1252 No stop 00 19 30 --- 04 00 07 13.6 189.0 0.6 0.0 226 1283 00 15 31 00 19 30 P0327-1803 04 00 07 14.3 187.7 0.5 0.0 -14 1283 No stop 00 21 00 --- 04 01 37 14.3 188.1 0.5 0.0 76 1295 00 19 31 00 21 00 J0322-18 04 01 37 13.6 189.3 0.6 0.0 -14 1295 No stop 00 25 00 --- 04 05 38 13.5 190.3 0.7 0.0 226 1326 00 21 01 00 25 30 P0327-1803 04 06 08 14.2 189.2 0.6 0.0 16 1326 00 25 30 00 26 30 --- 04 07 08 14.2 189.4 0.6 0.0 60 1333 00 25 31 00 26 30 J0322-18 04 07 08 13.5 190.7 0.7 0.0 -14 1333 No stop 00 30 30 --- 04 11 09 13.3 191.6 0.8 0.0 226 1364 00 26 31 00 30 30 P0327-1803 04 11 09 14.1 190.4 0.7 0.0 -14 1364 No stop 00 32 00 --- 04 12 39 14.1 190.8 0.7 0.0 76 1376 00 30 31 00 32 00 J0322-18 04 12 39 13.3 192.0 0.8 0.0 -14 1376 No stop 00 36 00 --- 04 16 40 13.2 193.0 0.9 0.0 226 1407 00 32 01 00 36 30 P0327-1803 04 17 10 14.0 191.9 0.8 0.0 16 1407 00 36 30 00 37 30 --- 04 18 10 13.9 192.1 0.8 0.0 60 1414 00 36 31 00 37 30 J0322-18 04 18 10 13.1 193.3 0.9 0.0 -14 1414 No stop 00 41 30 --- 04 22 11 13.0 194.3 1.0 0.0 226 1445 00 37 31 00 41 30 P0327-1803 04 22 11 13.8 193.1 0.9 0.0 -14 1445 No stop 00 43 00 --- 04 23 41 13.8 193.4 0.9 0.0 76 1457 00 41 31 00 43 00 J0322-18 04 23 41 13.0 194.7 1.0 0.0 -14 1457 No stop 00 47 00 --- 04 27 42 12.8 195.6 1.1 0.0 226 1488 00 43 01 00 47 30 P0327-1803 04 28 12 13.6 194.5 1.0 0.0 16 1488 00 47 30 00 48 30 --- 04 29 12 13.6 194.8 1.0 0.0 60 1496 00 47 31 00 48 30 J0322-18 04 29 12 12.8 196.0 1.1 0.0 -14 1496 No stop 00 52 30 --- 04 33 13 12.6 197.0 1.2 0.0 226 1527 00 48 31 Schedule for ONSALA85 (Code O8 ) Page 7 Exploring the jet in a z > 6 blazar DES J0322-18 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 ---------------------------------------------------------------------------------------- --- Fri 4 Nov 2022 Day 308 --- 00 52 30 P0327-1803 04 33 13 13.4 195.7 1.1 0.0 -14 1527 No stop 00 54 00 --- 04 34 43 13.4 196.1 1.1 0.0 76 1538 00 52 31 00 54 00 J0237+2848 04 34 43 55.1 227.6 1.9 0.0 -201 1538 No stop 01 00 00 =0234+285 04 40 44 54.5 229.7 2.0 0.0 159 1584 00 54 01 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess322.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: 5 Station: ONSALA85 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= 730.00 730.00 730.00 730.00 730.00 730.00 730.00 730.00 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 = A1 C1 A1 C1 A1 C1 A1 C1 The following frequency sets based on these setups were used. Frequency Set: 7 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= 896.49 896.49 896.49 896.49 960.49 960.49 960.49 960.49 Bandwd= 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 Matching frequency sets: 7 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) * J0322-18 03 19 58.268882 * 03 22 14.549000 03 23 17.592871 0.00 -18 51 58.03562 *-18 41 17.47800 -18 36 18.98498 0.00 From catalog imbedded in main SCHED input file. * P0327-1803 03 25 26.764400 * 03 27 43.341600 03 28 46.506554 0.00 -18 14 03.97885 *-18 03 42.02800 -17 58 51.74577 0.00 From catalog imbedded in main SCHED input file. 0003-066 00 03 40.288767 * 00 06 13.892888 00 07 24.259850 0.00 * J0006-0623 -06 40 17.29995 *-06 23 35.33538 -06 15 58.11474 0.01 J0006-06 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.gsfc GSFC 2016a X/S astro solution, 38365 observations. 0234+285 02 34 55.589590 * 02 37 52.405677 02 39 13.758997 0.00 * J0237+2848 28 35 11.40773 * 28 48 08.98999 28 54 08.07893 0.00 J0237+28 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.gsfc GSFC 2016a X/S astro solution, 58420 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 J0322-18 sess322.L1024 1 2 3 4 5 6 7 8 9 10 11 12 + 4.067 237.381 P0327-1803 sess322.L1024 1 2 3 4 5 6 7 8 9 10 11 12 + 1.400 70.801 J0006-0623 sess322.L1024 1 2 3 4 5 6 7 8 9 10 11 12 0.083 10.000 J0237+2848 sess322.L1024 1 2 3 4 5 6 7 8 9 10 11 12 0.183 9.543 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) J0322-18 144.2 P0327-1803 144.3 J0006-0623 137.3 J0237+2848 166.4 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