COVER INFORMATION Station: METSAHOV (Code Mh ) Experiment: RadioAstron AGN polarization imaging Exp. Code: gr039 Schedule Version: 1.00 Processed by SCHED version: 11.40 Release 11.4. March 14, 2015 PI: E.Ros Address: Max Planck Institute for Radio Astronomy Auf dem Hugel 69 D-53121 Bonn Phone: +79165452842 EMAIL: eros@mpifr-bonn.mpg.de Fax: Phone during observation: +79165452842 Observing mode: L-K-Q-band, dual-pol Notes: L-band, Radioastron-compatible frequency setup P-CAL is ON Tsys is ON auto-level (AGC) is ON Schedule for METSAHOV (Code Mh ) Page 2 RadioAstron AGN polarization imaging 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 ---------------------------------------------------------------------------------------- --- Mon 20 Mar 2017 Day 79 --- ---------- K-band VLBI scans. Space segment 01: 0615+820 ---------- Next scan frequencies: 22236.00 22236.00 22236.00 22236.00 22268.00 22268.00 22268.00 22268.00 Next BBC frequencies: 756.00 756.00 756.00 756.00 788.00 788.00 788.00 788.00 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 18 40 00 0615+820 08 11 31 67.2 -8.8 1.7 146.6 0 0 18 40 00 18 52 40 --- 08 24 13 66.9 -9.8 1.9 142.6 760 49 18 40 01 18 53 40 0615+820 08 25 13 66.9 -9.8 1.9 142.3 58 49 18 53 40 19 06 20 --- 08 37 55 66.6 -10.7 2.1 138.3 760 97 18 53 41 19 07 20 0615+820 08 38 55 66.6 -10.8 2.2 138.0 58 97 19 07 20 19 20 00 --- 08 51 37 66.3 -11.5 2.4 134.2 760 146 19 07 21 ---------- Ground segment 02: scans on 0615+820 at K-band ---------- 19 21 00 2007+777 08 52 37 48.3 3.7-11.2 -8.9 36 146 19 21 00 19 37 30 --- 09 09 10 48.5 5.0-10.9 -12.0 990 210 19 21 01 19 38 30 0615+820 09 10 10 65.8 -12.6 2.7 128.6 36 210 19 38 30 19 54 20 --- 09 26 03 65.4 -13.4 2.9 124.0 950 271 19 38 31 19 55 20 0615+820 09 27 03 65.3 -13.4 3.0 123.7 58 271 19 55 20 20 11 10 --- 09 42 56 64.9 -14.1 3.2 119.1 950 331 19 55 21 20 12 10 0615+820 09 43 56 64.8 -14.1 3.2 118.8 58 331 20 12 10 20 28 00 --- 09 59 49 64.3 -14.7 3.5 114.4 950 392 20 12 11 20 29 00 0615+820 10 00 49 64.3 -14.8 3.5 114.1 58 392 20 29 00 20 44 50 --- 10 16 41 63.8 -15.2 3.8 109.8 950 453 20 29 01 20 45 50 0615+820 10 17 41 63.8 -15.3 3.8 109.5 58 453 20 45 50 21 01 40 --- 10 33 34 63.2 -15.6 4.1 105.2 950 514 20 45 51 21 02 40 0615+820 10 34 34 63.2 -15.6 4.1 105.0 58 514 21 02 40 21 18 30 --- 10 50 27 62.7 -15.9 4.3 100.8 950 575 21 02 41 21 19 30 0615+820 10 51 27 62.6 -15.9 4.4 100.5 58 575 21 19 30 21 35 20 --- 11 07 20 62.1 -16.1 4.6 96.4 950 636 21 19 31 21 36 20 0615+820 11 08 20 62.1 -16.1 4.6 96.2 58 636 21 36 20 21 52 10 --- 11 24 12 61.5 -16.2 4.9 92.2 950 697 21 36 21 21 53 10 0615+820 11 25 12 61.5 -16.2 4.9 91.9 58 697 21 53 10 22 09 00 --- 11 41 05 60.9 -16.2 5.2 88.0 950 758 21 53 11 Schedule for METSAHOV (Code Mh ) Page 3 RadioAstron AGN polarization imaging 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 ---------------------------------------------------------------------------------------- --- Mon 20 Mar 2017 Day 79 --- ---------- K-band VLBI scans. Space segment 02: 0615+820 ---------- 22 10 00 0615+820 11 42 05 60.9 -16.2 5.2 87.8 58 758 22 10 00 22 22 40 --- 11 54 47 60.5 -16.1 5.4 84.7 760 806 22 10 01 22 23 40 0615+820 11 55 48 60.4 -16.1 5.4 84.4 58 806 22 23 40 22 36 20 --- 12 08 30 60.0 -16.0 5.6 81.4 760 855 22 23 41 22 37 20 0615+820 12 09 30 59.9 -16.0 5.7 81.1 58 855 22 37 20 22 50 00 --- 12 22 12 59.5 -15.9 5.9 78.1 760 904 22 37 21 ---------- Ground segment 03: scans on 0615+820 at K-band ---------- 22 51 00 0615+820 12 23 12 59.5 -15.8 5.9 77.9 58 904 22 51 00 23 10 10 --- 12 42 25 58.8 -15.5 6.2 73.4 1150 978 22 51 01 23 11 10 2007+777 12 43 25 54.3 19.7 -7.4 -53.0 19 978 23 11 10 23 27 00 --- 12 59 18 55.0 20.5 -7.1 -56.2 950 1038 23 11 11 23 28 00 0615+820 13 00 18 58.3 -15.1 6.5 69.3 18 1038 23 28 00 23 43 50 --- 13 16 11 57.7 -14.7 6.8 65.7 950 1099 23 28 01 --- Start: Mon 20 Mar 2017 Day 79 -- Stop: Tue 21 Mar 2017 Day 80 --- 23 44 50 0615+820 13 17 11 57.7 -14.7 6.8 65.5 58 1099 23 44 50 00 00 40 --- 13 33 03 57.2 -14.3 7.1 61.9 950 1160 23 44 51 00 01 40 0615+820 13 34 04 57.2 -14.2 7.1 61.7 58 1160 00 01 40 00 17 30 --- 13 49 56 56.7 -13.7 7.3 58.2 950 1221 00 01 41 00 18 30 0615+820 13 50 56 56.7 -13.7 7.4 58.0 58 1221 00 18 30 00 34 20 --- 14 06 49 56.2 -13.1 7.6 54.5 950 1282 00 18 31 00 35 20 0615+820 14 07 49 56.2 -13.1 7.6 54.3 58 1282 00 35 20 00 51 10 --- 14 23 42 55.8 -12.5 7.9 50.9 950 1343 00 35 21 00 52 10 0615+820 14 24 42 55.7 -12.5 7.9 50.6 58 1343 00 52 10 01 08 00 --- 14 40 35 55.3 -11.8 8.2 47.2 950 1404 00 52 11 01 09 00 0615+820 14 41 35 55.3 -11.8 8.2 47.0 58 1404 01 09 00 01 24 50 --- 14 57 27 54.9 -11.1 8.5 43.7 950 1465 01 09 01 01 25 50 0615+820 14 58 27 54.9 -11.1 8.5 43.4 58 1465 01 25 50 01 41 40 --- 15 14 20 54.5 -10.4 8.7 40.1 950 1526 01 25 51 Schedule for METSAHOV (Code Mh ) Page 4 RadioAstron AGN polarization imaging 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 21 Mar 2017 Day 80 --- 01 42 40 0615+820 15 15 20 54.5 -10.3 8.8 39.9 58 1526 01 42 40 01 58 30 --- 15 31 13 54.1 -9.6 9.0 36.5 950 1587 01 42 41 ---------- K-band VLBI scans. Space segment 03: 0615+820 ---------- 02 00 00 0615+820 15 32 43 54.1 -9.5 9.1 36.2 88 1587 02 00 00 02 12 40 --- 15 45 25 53.9 -8.9 9.3 33.6 760 1635 02 00 01 02 13 40 0615+820 15 46 25 53.8 -8.8 9.3 33.4 58 1635 02 13 40 02 26 20 --- 15 59 07 53.6 -8.2 9.5 30.7 760 1684 02 13 41 02 27 20 0615+820 16 00 08 53.6 -8.2 9.5 30.5 58 1684 02 27 20 02 40 00 --- 16 12 50 53.4 -7.5 9.7 27.9 760 1733 02 27 21 ---------- Ground segment 04: scans on 0615+820 at K-band ---------- 02 41 00 0615+820 16 13 50 53.4 -7.5 9.7 27.7 58 1733 02 41 00 02 51 00 --- 16 23 51 53.2 -6.9 9.9 25.6 600 1771 02 41 01 02 52 00 0615+820 16 24 52 53.2 -6.9 9.9 25.4 58 1771 02 52 00 03 07 50 --- 16 40 44 53.0 -6.0 10.2 22.2 950 1832 02 52 01 03 08 50 0615+820 16 41 44 53.0 -6.0 10.2 22.0 58 1832 03 08 50 03 24 40 --- 16 57 37 52.8 -5.1 10.5 18.7 950 1893 03 08 51 03 25 40 0615+820 16 58 37 52.8 -5.1 10.5 18.5 58 1893 03 25 40 03 41 30 --- 17 14 30 52.6 -4.2 10.7 15.3 950 1954 03 25 41 03 42 30 0615+820 17 15 30 52.6 -4.2 10.8 15.1 58 1954 03 42 30 03 58 20 --- 17 31 22 52.5 -3.3 11.0 11.8 950 2015 03 42 31 03 59 20 0615+820 17 32 23 52.4 -3.2 11.0 11.6 58 2015 03 59 20 04 15 10 --- 17 48 15 52.4 -2.3 11.3 8.4 950 2076 03 59 21 04 16 10 0615+820 17 49 15 52.3 -2.3 11.3 8.2 58 2076 04 16 10 04 32 00 --- 18 05 08 52.3 -1.4 11.6 5.0 950 2137 04 16 11 04 33 00 0615+820 18 06 08 52.3 -1.3 11.6 4.8 58 2137 04 33 00 04 48 50 --- 18 22 01 52.3 -0.4 11.9 1.5 950 2197 04 33 01 04 49 50 0615+820 18 23 01 52.3 -0.4 11.9 1.3 58 2197 04 49 50 05 05 40 --- 18 38 54 52.3 0.5-11.8 -1.9 950 2258 04 49 51 05 06 40 0615+820 18 39 54 52.3 0.6-11.8 -2.1 58 2258 05 06 40 05 22 30 --- 18 55 46 52.3 1.5-11.6 -5.3 950 2319 05 06 41 Schedule for METSAHOV (Code Mh ) Page 5 RadioAstron AGN polarization imaging 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 21 Mar 2017 Day 80 --- 05 23 30 0615+820 18 56 46 52.3 1.5-11.5 -5.5 58 2319 05 23 30 05 39 20 --- 19 12 39 52.4 2.4-11.3 -8.7 950 2380 05 23 31 ---------- K-band VLBI scans. Space segment 04: 0615+820 ---------- 05 40 00 0615+820 19 13 19 52.4 2.5-11.3 -8.9 38 2380 05 40 00 05 52 40 --- 19 26 01 52.4 3.2-11.1 -11.4 760 2429 05 40 01 05 53 40 0615+820 19 27 01 52.5 3.2-11.0 -11.7 58 2429 05 53 40 06 06 20 --- 19 39 44 52.5 3.9-10.8 -14.2 760 2478 05 53 41 06 07 20 0615+820 19 40 44 52.6 4.0-10.8 -14.4 58 2478 06 07 20 06 20 00 --- 19 53 26 52.7 4.7-10.6 -17.0 760 2526 06 07 21 ---------- Ground segment 05: scans on 0615+820 at K-band ---------- 06 21 00 0615+820 19 54 26 52.7 4.7-10.6 -17.2 58 2526 06 21 00 06 37 20 --- 20 10 49 52.9 5.6-10.3 -20.6 980 2589 06 21 01 06 37 20 0615+820 20 10 49 52.9 5.6-10.3 -20.6 -2 2589 No stop 06 53 10 --- 20 26 41 53.1 6.5-10.0 -23.8 948 2650 06 37 21 06 54 10 0615+820 20 27 41 53.1 6.5-10.0 -24.0 58 2650 06 54 10 07 10 00 --- 20 43 34 53.3 7.4 -9.8 -27.3 950 2711 06 54 11 07 11 00 0615+820 20 44 34 53.3 7.4 -9.8 -27.5 58 2711 07 11 00 07 26 50 --- 21 00 27 53.6 8.2 -9.5 -30.8 950 2772 07 11 01 07 27 50 0615+820 21 01 27 53.6 8.3 -9.5 -31.0 58 2772 07 27 50 07 43 40 --- 21 17 19 53.9 9.1 -9.2 -34.3 950 2833 07 27 51 07 44 40 0615+820 21 18 20 54.0 9.1 -9.2 -34.5 58 2833 07 44 40 08 00 30 --- 21 34 12 54.3 9.9 -8.9 -37.8 950 2894 07 44 41 08 01 30 0615+820 21 35 12 54.3 9.9 -8.9 -38.0 58 2894 08 01 30 08 17 20 --- 21 51 05 54.6 10.6 -8.6 -41.4 950 2954 08 01 31 08 18 20 0615+820 21 52 05 54.7 10.7 -8.6 -41.6 58 2954 08 18 20 08 34 10 --- 22 07 58 55.0 11.4 -8.4 -45.0 950 3015 08 18 21 08 35 10 0615+820 22 08 58 55.1 11.4 -8.3 -45.2 58 3015 08 35 10 08 51 00 --- 22 24 51 55.5 12.1 -8.1 -48.6 950 3076 08 35 11 08 52 00 0615+820 22 25 51 55.5 12.1 -8.1 -48.8 58 3076 08 52 00 09 07 50 --- 22 41 43 55.9 12.7 -7.8 -52.2 950 3137 08 52 01 Schedule for METSAHOV (Code Mh ) Page 6 RadioAstron AGN polarization imaging 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 21 Mar 2017 Day 80 --- ---------- K-band VLBI scans. Space segment 05: 0615+820 ---------- 09 10 00 0615+820 22 43 54 56.0 12.8 -7.8 -52.7 128 3137 09 10 00 09 24 30 --- 22 58 26 56.4 13.3 -7.5 -55.8 870 3193 09 10 01 09 25 30 0615+820 22 59 26 56.4 13.4 -7.5 -56.0 58 3193 09 25 30 09 39 40 --- 23 13 39 56.8 13.9 -7.3 -59.2 850 3247 09 25 31 09 40 40 0615+820 23 14 39 56.9 13.9 -7.2 -59.4 58 3247 09 40 40 09 54 50 --- 23 28 51 57.3 14.3 -7.0 -62.5 850 3302 09 40 41 09 55 50 0615+820 23 29 51 57.3 14.4 -7.0 -62.7 58 3302 09 55 50 10 10 00 --- 23 44 04 57.8 14.8 -6.8 -65.9 850 3356 09 55 51 ---------- Ground segment 06: scans on 0615+820 at K-band ---------- 10 11 00 0615+820 23 45 04 57.8 14.8 -6.7 -66.2 58 3356 10 11 00 10 27 20 --- 00 01 26 58.3 15.2 -6.5 -69.9 980 3419 10 11 01 10 28 20 2007+777 00 02 27 64.4 -24.6 4.0 98.7 14 3419 10 28 20 10 44 10 --- 00 18 19 63.5 -24.8 4.2 94.7 950 3480 10 28 21 10 45 10 0615+820 00 19 19 58.9 15.6 -6.2 -74.0 14 3480 10 45 10 11 01 00 --- 00 35 12 59.5 15.8 -5.9 -77.7 950 3541 10 45 11 11 02 00 0615+820 00 36 12 59.5 15.8 -5.9 -77.9 58 3541 11 02 00 11 17 50 --- 00 52 05 60.0 16.0 -5.6 -81.7 950 3602 11 02 01 11 18 50 0615+820 00 53 05 60.1 16.0 -5.6 -81.9 58 3602 11 18 50 11 34 40 --- 01 08 57 60.6 16.2 -5.3 -85.8 950 3663 11 18 51 11 35 40 0615+820 01 09 58 60.6 16.2 -5.3 -86.0 58 3663 11 35 40 11 51 30 --- 01 25 50 61.2 16.2 -5.1 -89.9 950 3724 11 35 41 11 52 30 0615+820 01 26 50 61.2 16.2 -5.0 -90.1 58 3724 11 52 30 12 08 20 --- 01 42 43 61.8 16.2 -4.8 -94.1 950 3785 11 52 31 12 09 20 0615+820 01 43 43 61.8 16.2 -4.8 -94.4 58 3785 12 09 20 12 25 10 --- 01 59 36 62.4 16.0 -4.5 -98.4 950 3846 12 09 21 12 26 10 0615+820 02 00 36 62.4 16.0 -4.5 -98.7 58 3846 12 26 10 12 42 00 --- 02 16 29 62.9 15.8 -4.2 -102.8 950 3906 12 26 11 12 43 00 0615+820 02 17 29 63.0 15.8 -4.2 -103.1 58 3906 12 43 00 12 58 50 --- 02 33 21 63.5 15.5 -3.9 -107.3 950 3967 12 43 01 Schedule for METSAHOV (Code Mh ) Page 7 RadioAstron AGN polarization imaging 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 21 Mar 2017 Day 80 --- ---------- K-band VLBI scans. Space segment 05: 0615+820 ---------- 13 00 00 0615+820 02 34 31 63.5 15.4 -3.9 -107.6 68 3967 13 00 00 13 14 30 --- 02 49 04 64.0 15.0 -3.7 -111.5 870 4023 13 00 01 13 15 30 0615+820 02 50 04 64.0 15.0 -3.7 -111.8 58 4023 13 15 30 13 29 40 --- 03 04 16 64.5 14.6 -3.4 -115.7 850 4078 13 15 31 13 30 40 0615+820 03 05 17 64.5 14.5 -3.4 -116.0 58 4078 13 30 40 13 44 50 --- 03 19 29 65.0 14.0 -3.2 -120.0 850 4132 13 30 41 13 45 50 0615+820 03 20 29 65.0 13.9 -3.2 -120.3 58 4132 13 45 50 14 00 00 --- 03 34 41 65.4 13.3 -2.9 -124.4 850 4187 13 45 51 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: ra1cm2.set --- 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: 38 Station: METSAHOV Total bit rate: 512 Format: MARK5B Bits per sample: 2 Sample rate: 32.000 Number of channels: 8 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 21480.00 21480.00 21480.00 21480.00 21480.00 21480.00 21480.00 21480.00 Net SB= U U L L U U L L IF SB = U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 9 1 9 3 11 3 11 BBC SB= U U L L U U L L IF = A1 B1 A1 B1 A1 B1 A1 B1 The following frequency sets based on these setups were used. Frequency Set: 25 Setup file default. Used with PCAL = 1MHz LO sum= 22236.00 22236.00 22236.00 22236.00 22268.00 22268.00 22268.00 22268.00 BBC fr= 756.00 756.00 756.00 756.00 788.00 788.00 788.00 788.00 Bandwd= 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 Matching frequency sets: 25 Track assignments are: track1= 2, 6, 10, 14, 4, 8, 12, 16 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 01 00.367264 0.00 85 16 41.77889 * 85 00 00.00000 84 54 17.22708 0.00 From catalog imbedded in main SCHED input file. fake circumpolar target for a TS to look at * 0615+820 06 15 32.765101 * 06 26 03.006221 06 29 37.890984 0.00 J0626+8202 82 03 56.43135 * 82 02 25.56790 82 01 53.90638 0.00 ./gr039_sources.radioastron AGN, rfc_2013d Petrov, 201d, RA-AO4-09 * 2007+777 20 07 20.430168 * 20 05 30.998496 20 04 50.658051 0.00 J2005+7752 77 43 58.12300 * 77 52 43.24753 77 55 30.00114 0.00 ./gr039_sources.radioastron AGN, rfc_2013d Petrov, 2013, unpublished 16338 observations, RA-AO3-04, RA-AO2-1 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 23 4.600 0.000 0615+820 ra18cm2.set 1 2 3 4 5 6 7 8 9 10 13 17.992 1564.327 ra1cm2.set 24 25 26 27 30 35 36 28.325 631.950 ra7mm2.set 31 34 46 56 7.350 595.039 2007+777 ra18cm2.set 1 2 3 4 6 7 8 9 10 0.867 34.039 ra1cm2.set 24 25 26 27 30 35 36 1.831 77.044 ra7mm2.set 31 34 46 56 0.856 82.328 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 94.8 0615+820 90.6 2007+777 83.6 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