COVER INFORMATION Station: SVETLOE (Code Sv ) Experiment: The nuclear structure in nearby AGN Exp. Code: gs032d Schedule Version: 1.00 Processed by SCHED version: 11.30 Version 11.3 update 1. April 14, 2014 PI: Tuomas Savolainen Address: MPIfR Bonn Auf dem Huegel 69 53121 Bonn, Germany Phone: +49 228 525 473 EMAIL: tsavolainen@mpifr-bonn.mpg.de Fax: +49 228 525 229 Phone during observation: +7 903 661 4865 Observing mode: L-band, dual-pol Notes: L-band, Radioastron-compatible frequency setup Mark5C stations should record in Mk5B+ format P-CAL is ON, Tsys is ON, auto-level (AGC) is ON Please send diskpacks to MPIfR Bonn Schedule for SVETLOE (Code Sv ) Page 2 The nuclear structure in nearby AGN 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 ---------------------------------------------------------------------------------------- --- Wed 4 Jun 2014 Day 155 --- ---------- Space segment 02: L-band VLBI scans ---------- Next scan frequencies: 1668.00 1668.00 1668.00 1668.00 Next BBC frequencies: 408.00 408.00 408.00 408.00 Next scan bandwidths: 16.00 16.00 16.00 16.00 11 45 00 1228+126 06 35 29 11.2 444.7 -5.9 -30.1 0 0 11 45 00 12 04 30 --- 06 55 03 13.6 448.9 -5.6 -30.2 1170 37 11 45 01 12 05 00 1228+126 06 55 33 13.6 449.1 -5.6 -30.2 24 37 12 05 00 12 24 30 --- 07 15 06 16.0 453.3 -5.3 -30.2 1170 75 12 05 01 ---------- L-band GRT-only VLBI scans - segment 03L ---------- 12 25 20 1236+077 07 15 56 10.9 454.1 -5.4 -29.7 25 75 12 25 20 12 27 50 --- 07 18 26 11.2 454.7 -5.4 -29.6 150 80 12 25 21 12 28 40 1228+126 07 19 17 16.6 454.2 -5.2 -30.1 24 80 12 28 40 12 38 10 --- 07 28 48 17.7 456.3 -5.0 -30.0 570 98 12 28 41 ---------- Allow time for Kalyazin and Evpatoria to change source ---------- 12 38 30 1228+126 07 29 08 17.8 456.4 -5.0 -30.0 14 98 12 38 30 12 48 00 --- 07 38 40 18.9 458.5 -4.9 -29.9 570 116 12 38 31 12 48 50 1236+077 07 39 30 13.7 459.3 -5.0 -29.3 24 116 12 48 50 12 51 50 --- 07 42 30 14.1 460.0 -5.0 -29.2 180 122 12 48 51 12 52 40 1222+037 07 43 21 12.4 465.4 -4.7 -28.4 24 122 12 52 40 12 55 40 --- 07 46 21 12.8 466.1 -4.7 -28.3 180 128 12 52 41 12 56 40 1228+126 07 47 21 20.0 460.5 -4.7 -29.7 31 128 12 56 40 13 05 40 --- 07 56 23 21.1 462.5 -4.6 -29.4 540 145 12 56 41 13 06 10 1228+126 07 56 53 21.1 462.7 -4.6 -29.4 24 145 13 06 10 13 15 40 --- 08 06 24 22.3 464.8 -4.4 -29.1 570 163 13 06 11 13 16 10 1228+126 08 06 54 22.3 465.0 -4.4 -29.1 24 163 13 16 10 13 25 40 --- 08 16 26 23.5 467.2 -4.3 -28.8 570 182 13 16 11 13 26 30 1236+077 08 17 16 18.2 467.9 -4.4 -28.2 24 182 13 26 30 13 29 00 --- 08 19 47 18.5 468.4 -4.3 -28.1 150 187 13 26 31 Schedule for SVETLOE (Code Sv ) Page 3 The nuclear structure in nearby AGN 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 ---------------------------------------------------------------------------------------- --- Wed 4 Jun 2014 Day 155 --- ---------- Space segment 03: L-band VLBI scans ---------- 13 30 00 1228+126 08 20 47 24.0 468.2 -4.2 -28.6 34 187 13 30 00 13 49 30 --- 08 40 20 26.2 472.8 -3.9 -27.6 1170 224 13 30 01 13 50 00 1228+126 08 40 50 26.3 473.0 -3.8 -27.6 24 224 13 50 00 14 09 30 --- 09 00 23 28.4 477.8 -3.5 -26.5 1170 262 13 50 01 ---------- L-band GRT-only VLBI scans - segment 04L ---------- 14 10 30 1236+077 09 01 23 23.2 478.3 -3.6 -25.9 34 262 14 10 30 14 13 00 --- 09 03 54 23.5 478.9 -3.6 -25.7 150 266 14 10 31 14 14 00 1228+126 09 04 54 28.9 478.9 -3.4 -26.2 34 266 14 14 00 14 24 00 --- 09 14 56 30.0 481.4 -3.3 -25.5 600 286 14 14 01 ---------- Allow time for Kalyazin and Evpatoria to change source ---------- 14 24 30 1228+126 09 15 26 30.0 481.5 -3.3 -25.4 24 286 14 24 30 14 34 30 --- 09 25 27 31.1 484.1 -3.1 -24.6 600 305 14 24 31 14 35 30 1236+077 09 26 27 25.9 484.5 -3.2 -24.1 34 305 14 35 30 14 38 00 --- 09 28 58 26.1 485.1 -3.2 -23.9 150 310 14 35 31 14 39 00 1222+037 09 29 58 23.9 490.8 -2.9 -21.9 34 310 14 39 00 14 42 00 --- 09 32 59 24.2 491.5 -2.9 -21.7 180 315 14 39 01 14 43 30 1226+023 09 34 29 22.6 491.4 -2.9 -21.7 73 315 14 43 30 14 52 30 --- 09 43 30 23.4 493.7 -2.8 -20.8 540 333 14 43 31 ---------- Allow time for Kalyazin and Evpatoria to change source ---------- 14 54 00 1228+126 09 45 00 33.0 489.3 -2.8 -22.9 56 333 14 54 00 15 04 00 --- 09 55 02 33.9 492.0 -2.6 -22.0 600 352 14 54 01 15 04 30 1228+126 09 55 32 34.0 492.1 -2.6 -21.9 24 352 15 04 30 15 14 30 --- 10 05 34 34.9 494.9 -2.4 -20.9 600 371 15 04 31 ---------- Space segment 04: L-band VLBI scans ---------- 15 15 00 1228+126 10 06 04 34.9 495.0 -2.4 -20.8 24 371 15 15 00 15 34 30 --- 10 25 37 36.5 500.6 -2.1 -18.7 1170 409 15 15 01 15 35 00 1228+126 10 26 07 36.6 500.7 -2.1 -18.6 24 409 15 35 00 15 54 30 --- 10 45 40 38.0 506.4 -1.8 -16.2 1170 446 15 35 01 Schedule for SVETLOE (Code Sv ) Page 4 The nuclear structure in nearby AGN 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 ---------------------------------------------------------------------------------------- --- Wed 4 Jun 2014 Day 155 --- ---------- L-band GRT-only VLBI scans - segment 05L ---------- 15 55 30 1236+077 10 46 41 32.8 505.9 -1.9 -16.1 34 446 15 55 30 15 58 00 --- 10 49 11 33.0 506.6 -1.8 -15.8 150 451 15 55 31 15 59 10 1228+126 10 50 21 38.3 507.8 -1.7 -15.5 44 451 15 59 10 16 08 00 --- 10 59 13 38.9 510.5 -1.5 -14.3 530 468 15 59 11 ---------- Allow time for Kalyazin and Evpatoria to change source ---------- 16 08 30 1228+126 10 59 43 38.9 510.7 -1.5 -14.3 24 468 16 08 30 16 18 00 --- 11 09 14 39.5 513.6 -1.4 -12.9 570 486 16 08 31 16 19 00 1236+077 11 10 14 34.3 512.7 -1.5 -13.2 35 486 16 19 00 16 21 30 --- 11 12 45 34.4 513.4 -1.5 -12.8 150 491 16 19 01 16 22 30 1222+037 11 13 45 31.3 518.9 -1.2 -10.2 34 491 16 22 30 16 25 30 --- 11 16 46 31.4 519.7 -1.1 -9.8 180 497 16 22 31 16 27 00 1228+126 11 18 16 39.9 516.4 -1.2 -11.6 58 497 16 27 00 16 35 30 --- 11 26 47 40.3 519.1 -1.1 -10.4 510 513 16 27 01 16 36 00 1228+126 11 27 17 40.4 519.2 -1.1 -10.3 24 513 16 36 00 16 45 30 --- 11 36 49 40.7 522.2 -0.9 -8.8 570 531 16 36 01 16 46 40 1236+077 11 37 59 35.6 520.9 -1.0 -9.3 45 531 16 46 40 16 49 10 --- 11 40 29 35.7 521.7 -1.0 -9.0 150 536 16 46 41 16 50 20 1228+126 11 41 40 40.9 523.8 -0.8 -8.1 45 536 16 50 20 16 59 20 --- 11 50 41 41.2 526.7 -0.7 -6.7 540 554 16 50 21 ---------- Space segment 05: L-band VLBI scans ---------- 17 00 00 1228+126 11 51 21 41.2 526.9 -0.7 -6.6 34 554 17 00 00 17 19 30 --- 12 10 54 41.6 533.2 -0.3 -3.4 1170 591 17 00 01 17 20 00 1228+126 12 11 24 41.6 533.4 -0.3 -3.3 24 591 17 20 00 17 39 30 --- 12 30 58 41.8 539.8 -0.0 -0.1 1170 629 17 20 01 ---------- L-band GRT-only VLBI scans - segment 06L ---------- 17 40 40 1236+077 12 32 08 36.9 537.5 -0.1 -1.2 45 629 17 40 40 17 43 10 --- 12 34 38 36.9 538.3 -0.1 -0.8 150 633 17 40 41 Schedule for SVETLOE (Code Sv ) Page 5 The nuclear structure in nearby AGN 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 ---------------------------------------------------------------------------------------- --- Wed 4 Jun 2014 Day 155 --- 17 44 20 1228+126 12 35 48 41.8 541.4 0.1 0.7 45 633 17 44 20 17 53 10 --- 12 44 40 41.7 544.3 0.2 2.2 530 650 17 44 21 ---------- Allow time for Kalyazin and Evpatoria to change source ---------- 17 53 40 1228+126 12 45 10 41.7 544.5 0.2 2.2 24 650 17 53 40 18 03 10 --- 12 54 42 41.6 547.6 0.4 3.8 570 669 17 53 41 18 04 20 1236+077 12 55 52 36.8 544.9 0.3 2.4 45 669 18 04 20 18 06 50 --- 12 58 22 36.8 545.6 0.3 2.8 150 673 18 04 21 18 07 50 1222+037 12 59 22 32.5 550.0 0.6 4.9 37 673 18 07 50 18 10 50 --- 13 02 23 32.5 550.9 0.6 5.3 180 679 18 07 51 18 11 40 1226+023 13 03 13 31.1 549.7 0.6 4.8 35 679 18 11 40 18 20 00 --- 13 11 34 30.9 552.2 0.7 6.0 500 695 18 11 41 18 21 40 1228+126 13 13 15 41.2 553.6 0.7 6.8 64 695 18 21 40 18 30 10 --- 13 21 46 40.9 556.3 0.8 8.1 510 712 18 21 41 18 30 40 1228+126 13 22 16 40.9 556.5 0.8 8.2 24 712 18 30 40 18 40 10 --- 13 31 48 40.5 559.5 1.0 9.7 570 730 18 30 41 18 41 20 1236+077 13 32 58 36.0 556.3 0.9 8.0 46 730 18 41 20 18 43 50 --- 13 35 28 35.9 557.0 0.9 8.3 150 735 18 41 21 ---------- Space segment 06: L-band VLBI scans ---------- 18 45 00 1228+126 13 36 38 40.3 561.0 1.1 10.4 46 735 18 45 00 19 04 30 --- 13 56 12 39.3 567.1 1.4 13.3 1170 772 18 45 01 19 05 00 1228+126 13 56 42 39.3 567.3 1.4 13.3 24 772 19 05 00 19 24 30 --- 14 16 15 38.1 573.2 1.7 16.0 1170 810 19 05 01 ---------- L-band GRT-only VLBI scans - segment 07L ---------- 19 25 30 1236+077 14 17 15 33.9 569.4 1.6 14.1 37 810 19 25 30 19 28 00 --- 14 19 45 33.7 570.1 1.7 14.4 150 814 19 25 31 19 29 00 1228+126 14 20 46 37.8 574.5 1.8 16.6 37 814 19 29 00 19 38 00 --- 14 29 47 37.1 577.2 2.0 17.7 540 832 19 29 01 Schedule for SVETLOE (Code Sv ) Page 6 The nuclear structure in nearby AGN 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 ---------------------------------------------------------------------------------------- --- Wed 4 Jun 2014 Day 155 --- ---------- Allow time for Kalyazin and Evpatoria to change source ---------- 19 38 30 1228+126 14 30 17 37.1 577.3 2.0 17.8 24 832 19 38 30 19 48 00 --- 14 39 49 36.4 580.1 2.1 18.9 570 850 19 38 31 19 49 00 1236+077 14 40 49 32.3 576.1 2.0 17.0 37 850 19 49 00 19 51 30 --- 14 43 19 32.1 576.8 2.1 17.3 150 855 19 49 01 19 52 30 1222+037 14 44 20 27.1 579.6 2.3 18.3 35 855 19 52 30 19 55 30 --- 14 47 20 26.9 580.4 2.4 18.6 180 861 19 52 31 19 57 00 1228+126 14 48 50 35.6 582.7 2.3 20.0 57 861 19 57 00 20 05 30 --- 14 57 22 34.9 585.1 2.4 20.9 510 877 19 57 01 20 06 00 1228+126 14 57 52 34.9 585.2 2.4 20.9 24 877 20 06 00 20 15 30 --- 15 07 23 34.0 587.8 2.6 21.9 570 895 20 06 01 20 16 30 1236+077 15 08 23 30.1 583.7 2.5 20.0 36 895 20 16 30 20 19 00 --- 15 10 54 29.9 584.4 2.5 20.3 150 900 20 16 31 20 20 00 1228+126 15 11 54 33.6 589.0 2.7 22.4 36 900 20 20 00 20 29 20 --- 15 21 16 32.7 591.6 2.8 23.2 560 918 20 20 01 ---------- Space segment 07: L-band VLBI scans ---------- 20 30 00 1228+126 15 21 56 32.6 591.7 2.8 23.3 34 918 20 30 00 20 49 30 --- 15 41 29 30.7 596.9 3.2 24.9 1170 955 20 30 01 20 50 00 1228+126 15 41 59 30.6 597.0 3.2 25.0 24 955 20 50 00 21 09 30 --- 16 01 32 28.6 601.9 3.5 26.4 1170 993 20 50 01 ---------- L-band GRT-only VLBI scans - segment 08L ---------- 21 10 30 1236+077 16 02 32 25.0 597.7 3.4 24.8 36 993 21 10 30 21 13 00 --- 16 05 03 24.7 598.3 3.4 25.0 150 998 21 10 31 21 14 00 1228+126 16 06 03 28.1 603.1 3.6 26.7 36 998 21 14 00 21 24 00 --- 16 16 05 27.0 605.5 3.7 27.3 600 1017 21 14 01 ---------- Allow time for Kalyazin and Evpatoria to change source ---------- 21 24 30 1228+126 16 16 35 26.9 605.7 3.8 27.3 24 1017 21 24 30 21 34 00 --- 16 26 06 25.8 608.0 3.9 27.8 570 1035 21 24 31 Schedule for SVETLOE (Code Sv ) Page 7 The nuclear structure in nearby AGN 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 ---------------------------------------------------------------------------------------- --- Wed 4 Jun 2014 Day 155 --- 21 35 00 1236+077 16 27 06 22.3 603.7 3.8 26.4 36 1035 21 35 00 21 37 30 --- 16 29 37 22.1 604.3 3.8 26.6 150 1040 21 35 01 21 38 30 1222+037 16 30 37 16.8 606.1 4.1 26.8 35 1040 21 38 30 21 41 30 --- 16 33 37 16.4 606.8 4.1 26.9 180 1046 21 38 31 21 43 00 1228+126 16 35 08 24.8 610.1 4.1 28.3 58 1046 21 43 00 21 51 30 --- 16 43 39 23.8 612.1 4.2 28.6 510 1062 21 43 01 21 52 00 1228+126 16 44 09 23.7 612.2 4.2 28.7 24 1062 21 52 00 22 01 30 --- 16 53 41 22.6 614.4 4.4 29.0 570 1080 21 52 01 22 02 30 1236+077 16 54 41 19.2 610.2 4.2 27.8 36 1080 22 02 30 22 05 00 --- 16 57 11 18.9 610.8 4.3 27.9 150 1085 22 02 31 22 06 00 1228+126 16 58 11 22.1 615.5 4.4 29.2 36 1085 22 06 00 22 14 30 --- 17 06 43 21.1 617.4 4.6 29.4 510 1102 22 06 01 22 15 00 1228+126 17 07 13 21.0 617.6 4.6 29.5 24 1102 22 15 00 22 20 30 --- 17 12 44 20.3 618.8 4.7 29.6 330 1112 22 15 01 22 21 30 1236+077 17 13 44 17.0 614.6 4.6 28.6 36 1112 22 21 30 22 24 00 --- 17 16 14 16.7 615.1 4.6 28.7 150 1117 22 21 31 ---------- Space segment 08: L-band VLBI scans ---------- 22 25 00 1228+126 17 17 15 19.8 619.8 4.8 29.7 36 1117 22 25 00 22 44 30 --- 17 36 48 17.4 624.2 5.1 30.1 1170 1154 22 25 01 22 45 00 1228+126 17 37 18 17.4 624.3 5.1 30.1 24 1154 22 45 00 23 04 30 --- 17 56 51 15.0 628.6 5.4 30.2 1170 1192 22 45 01 23 05 00 1228+126 17 57 21 14.9 628.7 5.4 30.2 24 1192 23 05 00 23 24 30 --- 18 16 54 12.5 633.0 5.8 30.2 1170 1229 23 05 01 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: ra18cm2.set Matching groups in ./gs032d_freq.dat: kvzr_l passed by Alexey Melnikov, Mar2014 Setup group: 20 Station: SVETLOE Total bit rate: 256 Format: MARK5B Bits per sample: 2 Sample rate: 32.000 Number of channels: 4 DBE type: Speedup factor: 1.00 Disk used to record data. 1st LO= 1260.00 1260.00 1260.00 1260.00 Net SB= U U L L IF SB = U U U U Pol. = RCP LCP RCP LCP BBC = 1 9 1 9 BBC SB= U U L L IF = A B A B The following frequency sets based on these setups were used. Frequency Set: 7 Setup file default. Used with PCAL = 1MHz LO sum= 1668.00 1668.00 1668.00 1668.00 BBC fr= 408.00 408.00 408.00 408.00 Bandwd= 16.00 16.00 16.00 16.00 Matching frequency sets: 7 10 11 Track assignments are: track1= 2, 4, 6, 8 barrel=roll_off POSITIONS OF SOURCES USED IN RECORDING SCANS Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * FAKERA 11 57 21.769299 * 12 00 00.000000 12 00 41.923521 0.00 85 16 41.77889 * 85 00 00.00000 84 55 27.17430 0.00 From catalog imbedded in main SCHED input file. fake circumpolar target for a TS to look at J1239+0730 12 36 52.308755 * 12 39 24.588327 12 40 09.440650 0.10 * 1236+077 07 46 45.39997 * 07 30 17.18902 07 25 31.24531 0.11 J1239+07 From catalog imbedded in main SCHED input file. rfc_2012b Petrov, 2012, unpublished 1855 observations J1224+0330 12 22 19.097169 * 12 24 52.421935 12 25 37.543272 0.11 * 1222+037 03 47 27.06583 * 03 30 50.29268 03 25 59.94064 0.13 J1224+03 From catalog imbedded in main SCHED input file. rfc_2012b Petrov, 2012, unpublished 688 observations * 1226+023 12 26 33.245835 * 12 29 06.699731 12 29 51.900411 0.00 J1229+0203 02 19 43.30547 * 02 03 08.59797 01 58 18.56773 0.00 3C273B ./gs032d_sources.radioastron 3C273 AGN, rfc_2013d Petrov, 2013, unpublished 32011 observations * 1228+126 12 28 17.569280 * 12 30 49.423382 12 31 34.048480 0.00 J1230+1223 12 40 01.74883 * 12 23 28.04365 12 18 41.71051 0.00 3C274 ./gs032d_sources.radioastron M87 AGN, rfc_2013d Petrov, 2013, unpublished 55201 observations VIR-A 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 FAKERA ra18cm2.set 8 5.525 0.000 1236+077 ra18cm2.set 1 2 3 4 6 7 8 13 14 15 16 1 + 1.192 78.475 1222+037 ra18cm2.set 1 2 3 4 6 7 13 14 15 16 17 + 0.483 28.442 1226+023 ra18cm2.set 1 2 3 4 6 7 8 13 14 15 16 1 + 0.589 40.489 1228+126 ra18cm2.set 1 2 3 4 6 7 8 13 14 15 16 1 + 12.719 1103.989 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) FAKERA 69.1 1236+077 111.8 1222+037 110.4 1226+023 112.0 1228+126 107.7 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