COVER INFORMATION Station: SHANGHAI (Code Sh ) Experiment: X band NME+FTP-FT Experiment Exp. Code: N13X4 Schedule Version: 1.00 Processed by SCHED version: 10.20 Release of about July 12, 2012 PI: Gabriele SURCIS Address: JIVE Postbus 2 7990 AA Dwingeloo The Netherlands Phone: +31-521-596508 EMAIL: surcis@jive.nl Fax: Phone during observation: +31-521-596508 Observing mode: 512-8-2 Notes: 8 x 16 MHz, 2 bit sampling Check antenna pointing, Please Two FTP-FT scan scheduled. COVER LETTER: This is the schedule for the 3.6 NME and ftp fringe-test on 04 November 2013 involving 12 antennas: Eb Wb On20 Mc Nt Ys Sv Zc Bd Ur Sh Hh (+Md). The schedule consists of long integrations on strong calibrators like J1751+0939 and J1850+2825 as well as phase-referencing parts with a continuum source as target. Two ftp-fringe tests are scheduled throughout the experiment: ~10:40 (scan 2, 2 sec, J1751+0939) ~13:22 (scan 67, 2 sec, J1850+2825) Please make sure that the autoftp is set up correctly. Thanks! Good luck with the session! Gabriele Schedule for SHANGHAI (Code Sh ) Page 2 X band NME+FTP-FT Experiment 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 4 Nov 2013 Day 308 --- Next scan frequencies: 8391.49 8391.49 8391.49 8391.49 8407.49 8407.49 8407.49 8407.49 8423.49 8423.49 8423.49 8423.49 8439.49 8439.49 8439.49 8439.49 Next BBC frequencies: 708.51 708.51 708.51 708.51 692.51 692.51 692.51 692.51 676.51 676.51 676.51 676.51 660.51 660.51 660.51 660.51 Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 10 30 00 J1751+0939 21 30 08 35.2 259.3 3.6 58.6 0 0 10 30 00 10 35 00 =1749+096 21 35 08 34.2 260.0 3.7 58.8 300 19 10 30 01 10 36 00 J1751+0939 21 36 09 34.0 260.2 3.7 58.9 58 19 10 36 00 10 41 00 =1749+096 21 41 09 32.9 261.0 3.8 59.1 300 39 10 36 01 10 42 00 J1751+0939 21 42 10 32.7 261.1 3.8 59.1 58 39 10 42 00 10 47 00 =1749+096 21 47 10 31.6 261.9 3.9 59.3 300 58 10 42 01 10 49 00 J1925+2106 21 49 11 56.6 261.4 2.4 65.2 74 58 10 49 00 10 51 00 =1923+210 21 51 11 56.2 261.7 2.4 65.3 120 66 10 49 01 10 51 00 J1925+2106 21 51 11 56.2 261.7 2.4 65.3 -2 66 No stop 10 53 00 =1923+210 21 53 11 55.8 262.1 2.4 65.4 118 74 10 51 01 10 54 00 J1931+2243 21 54 12 57.4 264.0 2.4 67.4 53 74 10 54 00 10 55 30 =1929+226 21 55 42 57.1 264.3 2.4 67.5 90 79 10 54 01 10 55 30 J1925+2106 21 55 42 55.3 262.5 2.5 65.5 -7 79 No stop 10 57 30 =1923+210 21 57 42 54.8 262.8 2.5 65.6 113 87 10 55 31 10 58 30 J1931+2243 21 58 42 56.4 264.7 2.4 67.6 53 87 10 58 30 11 00 00 =1929+226 22 00 13 56.1 265.0 2.5 67.7 90 93 10 58 31 11 00 00 J1925+2106 22 00 13 54.3 263.2 2.6 65.7 -7 93 No stop 11 02 00 =1923+210 22 02 13 53.9 263.6 2.6 65.8 113 101 11 00 01 11 03 00 J1931+2243 22 03 13 55.5 265.4 2.5 67.8 53 101 11 03 00 11 04 30 =1929+226 22 04 43 55.1 265.7 2.5 67.8 90 106 11 03 01 11 04 30 J1925+2106 22 04 43 53.3 264.0 2.6 65.9 -7 106 No stop 11 06 30 =1923+210 22 06 44 52.9 264.3 2.7 66.0 113 114 11 04 31 11 07 30 J1931+2243 22 07 44 54.5 266.1 2.6 67.9 53 114 11 07 30 11 09 00 =1929+226 22 09 14 54.2 266.4 2.6 67.9 90 120 11 07 31 11 09 00 J1925+2106 22 09 14 52.4 264.7 2.7 66.1 -7 120 No stop 11 11 00 =1923+210 22 11 14 52.0 265.0 2.7 66.1 113 128 11 09 01 Schedule for SHANGHAI (Code Sh ) Page 3 X band NME+FTP-FT Experiment 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 4 Nov 2013 Day 308 --- 11 12 00 J1931+2243 22 12 15 53.5 266.8 2.7 68.0 53 128 11 12 00 11 13 30 =1929+226 22 13 45 53.2 267.0 2.7 68.0 90 134 11 12 01 11 13 30 J1925+2106 22 13 45 51.4 265.4 2.8 66.2 -7 134 No stop 11 15 30 =1923+210 22 15 45 51.0 265.7 2.8 66.3 113 141 11 13 31 11 16 30 J1931+2243 22 16 45 52.6 267.4 2.7 68.1 53 141 11 16 30 11 18 00 =1929+226 22 18 16 52.2 267.7 2.8 68.1 90 147 11 16 31 11 18 00 J1925+2106 22 18 16 50.5 266.0 2.9 66.3 -7 147 No stop 11 20 00 =1923+210 22 20 16 50.0 266.3 2.9 66.4 113 155 11 18 01 11 21 00 J1931+2243 22 21 16 51.6 268.1 2.8 68.1 53 155 11 21 00 11 22 30 =1929+226 22 22 46 51.3 268.3 2.8 68.2 90 161 11 21 01 11 22 30 J1925+2106 22 22 46 49.5 266.7 2.9 66.4 -7 161 No stop 11 24 30 =1923+210 22 24 47 49.1 267.0 3.0 66.5 113 168 11 22 31 11 25 30 J1931+2243 22 25 47 50.6 268.7 2.9 68.2 53 168 11 25 30 11 27 00 =1929+226 22 27 17 50.3 268.9 2.9 68.2 90 174 11 25 31 11 27 00 J1925+2106 22 27 17 48.5 267.3 3.0 66.5 -7 174 No stop 11 29 00 =1923+210 22 29 17 48.1 267.6 3.0 66.5 113 182 11 27 01 11 30 00 J1931+2243 22 30 17 49.7 269.3 3.0 68.2 53 182 11 30 00 11 31 30 =1929+226 22 31 48 49.3 269.5 3.0 68.2 90 188 11 30 01 11 31 30 J1925+2106 22 31 48 47.6 268.0 3.1 66.6 -7 188 No stop 11 33 30 =1923+210 22 33 48 47.1 268.2 3.1 66.6 113 195 11 31 31 11 34 30 J1931+2243 22 34 48 48.7 269.9 3.0 68.2 53 195 11 34 30 11 36 00 =1929+226 22 36 18 48.4 270.1 3.1 68.2 90 201 11 34 31 11 36 00 J1925+2106 22 36 18 46.6 268.6 3.2 66.6 -7 201 No stop 11 38 00 =1923+210 22 38 19 46.2 268.8 3.2 66.6 113 209 11 36 01 11 39 00 J1931+2243 22 39 19 47.7 270.5 3.1 68.2 53 209 11 39 00 11 40 30 =1929+226 22 40 49 47.4 270.7 3.1 68.2 90 215 11 39 01 11 40 30 J1925+2106 22 40 49 45.6 269.2 3.2 66.6 -7 215 No stop 11 42 30 =1923+210 22 42 50 45.2 269.4 3.3 66.6 113 223 11 40 31 11 43 30 J1931+2243 22 43 50 46.8 271.0 3.2 68.2 53 223 11 43 30 11 45 00 =1929+226 22 45 20 46.4 271.2 3.2 68.2 90 228 11 43 31 Schedule for SHANGHAI (Code Sh ) Page 4 X band NME+FTP-FT Experiment 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 4 Nov 2013 Day 308 --- 11 45 00 J1925+2106 22 45 20 44.7 269.8 3.3 66.6 -7 228 No stop 11 47 00 =1923+210 22 47 20 44.2 270.0 3.3 66.6 113 236 11 45 01 11 48 00 J1931+2243 22 48 20 45.8 271.6 3.3 68.2 53 236 11 48 00 11 49 30 =1929+226 22 49 51 45.5 271.8 3.3 68.1 90 242 11 48 01 11 49 30 J1925+2106 22 49 51 43.7 270.4 3.4 66.6 -7 242 No stop 11 51 30 =1923+210 22 51 51 43.3 270.6 3.4 66.6 113 250 11 49 31 11 52 30 J1931+2243 22 52 51 44.8 272.1 3.3 68.1 53 250 11 52 30 11 54 00 =1929+226 22 54 21 44.5 272.3 3.4 68.1 90 255 11 52 31 11 54 00 J1925+2106 22 54 21 42.7 270.9 3.5 66.6 -7 255 No stop 11 56 00 =1923+210 22 56 22 42.3 271.2 3.5 66.6 113 263 11 54 01 11 57 00 J1931+2243 22 57 22 43.9 272.7 3.4 68.1 53 263 11 57 00 11 58 30 =1929+226 22 58 52 43.6 272.9 3.4 68.0 90 269 11 57 01 11 58 30 J1925+2106 22 58 52 41.8 271.5 3.5 66.6 -7 269 No stop 12 00 30 =1923+210 23 00 52 41.3 271.7 3.6 66.6 113 277 11 58 31 12 01 30 J1931+2243 23 01 53 42.9 273.2 3.5 68.0 53 277 12 01 30 12 03 00 =1929+226 23 03 23 42.6 273.4 3.5 68.0 90 283 12 01 31 12 03 00 J1925+2106 23 03 23 40.8 272.0 3.6 66.6 -7 283 No stop 12 05 00 =1923+210 23 05 23 40.4 272.3 3.6 66.5 113 290 12 03 01 12 06 00 J1931+2243 23 06 23 41.9 273.7 3.6 67.9 53 290 12 06 00 12 07 30 =1929+226 23 07 54 41.6 273.9 3.6 67.9 90 296 12 06 01 12 07 30 J1925+2106 23 07 54 39.8 272.6 3.7 66.5 -7 296 No stop 12 09 30 =1923+210 23 09 54 39.4 272.8 3.7 66.5 113 304 12 07 31 12 10 30 J1931+2243 23 10 54 41.0 274.3 3.6 67.8 53 304 12 10 30 12 12 00 =1929+226 23 12 24 40.7 274.4 3.7 67.8 90 310 12 10 31 12 12 00 J1925+2106 23 12 24 38.9 273.1 3.8 66.4 -7 310 No stop 12 14 00 =1923+210 23 14 25 38.4 273.4 3.8 66.4 113 317 12 12 01 12 15 00 J1931+2243 23 15 25 40.0 274.8 3.7 67.7 53 317 12 15 00 12 16 30 =1929+226 23 16 55 39.7 275.0 3.7 67.7 90 323 12 15 01 12 16 30 J1925+2106 23 16 55 37.9 273.7 3.8 66.4 -7 323 No stop 12 18 30 =1923+210 23 18 55 37.5 273.9 3.9 66.3 113 331 12 16 31 Schedule for SHANGHAI (Code Sh ) Page 5 X band NME+FTP-FT Experiment 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 4 Nov 2013 Day 308 --- 12 19 30 J1931+2243 23 19 56 39.1 275.3 3.8 67.6 53 331 12 19 30 12 21 00 =1929+226 23 21 26 38.7 275.5 3.8 67.6 90 337 12 19 31 12 21 00 J1925+2106 23 21 26 36.9 274.2 3.9 66.3 -7 337 No stop 12 23 00 =1923+210 23 23 26 36.5 274.4 3.9 66.2 113 344 12 21 01 12 24 00 J1931+2243 23 24 26 38.1 275.8 3.9 67.5 53 344 12 24 00 12 25 30 =1929+226 23 25 57 37.8 276.0 3.9 67.4 90 350 12 24 01 12 25 30 J1925+2106 23 25 57 36.0 274.7 4.0 66.2 -7 350 No stop 12 27 30 =1923+210 23 27 57 35.6 275.0 4.0 66.2 113 358 12 25 31 12 28 30 J1931+2243 23 28 57 37.1 276.3 3.9 67.4 53 358 12 28 30 12 30 00 =1929+226 23 30 27 36.8 276.5 4.0 67.3 90 364 12 28 31 12 30 00 J1925+2106 23 30 27 35.0 275.3 4.1 66.1 -7 364 No stop 12 32 00 =1923+210 23 32 28 34.6 275.5 4.1 66.0 113 372 12 30 01 12 33 00 J1931+2243 23 33 28 36.2 276.8 4.0 67.2 53 372 12 33 00 12 34 30 =1929+226 23 34 58 35.9 277.0 4.0 67.2 90 377 12 33 01 12 34 30 J1925+2106 23 34 58 34.1 275.8 4.1 66.0 -7 377 No stop 12 36 30 =1923+210 23 36 58 33.6 276.0 4.2 65.9 113 385 12 34 31 12 37 30 J1931+2243 23 37 59 35.2 277.3 4.1 67.1 53 385 12 37 30 12 39 00 =1929+226 23 39 29 34.9 277.5 4.1 67.0 90 391 12 37 31 12 39 00 J1925+2106 23 39 29 33.1 276.3 4.2 65.9 -7 391 No stop 12 41 00 =1923+210 23 41 29 32.7 276.5 4.2 65.8 113 399 12 39 01 12 42 00 J1931+2243 23 42 29 34.3 277.8 4.2 66.9 53 399 12 42 00 12 43 30 =1929+226 23 44 00 33.9 278.0 4.2 66.9 90 404 12 42 01 12 43 30 J1925+2106 23 44 00 32.1 276.8 4.3 65.7 -7 404 No stop 12 45 30 =1923+210 23 46 00 31.7 277.0 4.3 65.7 113 412 12 43 31 12 46 30 J1931+2243 23 47 00 33.3 278.3 4.2 66.8 53 412 12 46 30 12 48 00 =1929+226 23 48 30 33.0 278.5 4.3 66.7 90 418 12 46 31 12 48 00 J1925+2106 23 48 30 31.2 277.3 4.4 65.6 -7 418 No stop 12 50 00 =1923+210 23 50 31 30.8 277.5 4.4 65.5 113 426 12 48 01 12 51 00 J1931+2243 23 51 31 32.3 278.8 4.3 66.6 53 426 12 51 00 12 52 30 =1929+226 23 53 01 32.0 279.0 4.4 66.5 90 432 12 51 01 Schedule for SHANGHAI (Code Sh ) Page 6 X band NME+FTP-FT Experiment 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 4 Nov 2013 Day 308 --- 12 52 30 J1925+2106 23 53 01 30.2 277.8 4.4 65.4 -7 432 No stop 12 54 30 =1923+210 23 55 01 29.8 278.0 4.5 65.4 113 439 12 52 31 12 55 30 J1931+2243 23 56 02 31.4 279.3 4.4 66.4 53 439 12 55 30 12 57 00 =1929+226 23 57 32 31.1 279.4 4.4 66.4 90 445 12 55 31 12 57 00 J1925+2106 23 57 32 29.3 278.3 4.5 65.3 -7 445 No stop 12 59 00 =1923+210 23 59 32 28.8 278.5 4.5 65.2 113 453 12 57 01 13 00 00 J1931+2243 00 00 32 30.4 279.8 4.5 66.2 53 453 13 00 00 13 01 30 =1929+226 00 02 03 30.1 279.9 4.5 66.2 90 459 13 00 01 13 01 30 J1925+2106 00 02 03 28.3 278.8 4.6 65.1 -7 459 No stop 13 03 30 =1923+210 00 04 03 27.9 279.1 4.6 65.0 113 466 13 01 31 13 04 30 J1931+2243 00 05 03 29.5 280.2 4.6 66.0 53 466 13 04 30 13 06 00 =1929+226 00 06 33 29.2 280.4 4.6 66.0 90 472 13 04 31 13 07 00 J1925+2106 00 07 33 27.1 279.4 4.7 64.9 53 472 13 07 00 13 09 00 =1923+210 00 09 34 26.7 279.7 4.7 64.8 120 480 13 07 01 13 11 00 J1850+2825 00 11 34 22.0 290.9 5.3 65.5 105 480 13 11 00 13 17 00 =1848+283 00 17 35 20.8 291.5 5.4 65.0 360 503 13 11 01 13 18 00 J1850+2825 00 18 35 20.6 291.6 5.5 64.9 58 503 13 18 00 13 23 00 =1848+283 00 23 36 19.6 292.1 5.5 64.5 300 523 13 18 01 13 24 00 J1850+2825 00 24 36 19.4 292.2 5.6 64.4 58 523 13 24 00 13 30 00 =1848+283 00 30 37 18.2 292.8 5.7 63.9 360 546 13 24 01 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess313.X512 Matching groups in /aps3/sched10.2/catalogs/freq.dat: shxd From An Tao 18May2006. Dummy dual pol - only RCP available Setup group: 8 Station: SHANGHAI Total bit rate: 512 Format: MARK5B Bits per sample: 2 Sample rate: 16.000 Number of channels: 16 DBE type: Speedup factor: 1.00 Disk used to record data. 1st LO= 9100.00 9100.00 9100.00 9100.00 9100.00 9100.00 9100.00 9100.00 9100.00 9100.00 9100.00 9100.00 9100.00 9100.00 9100.00 9100.00 Net SB= L L U U L L U U L L U U L L U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 2 1 2 3 4 3 4 5 6 5 6 7 8 7 8 BBC SB= U U L L U U L L U U L L U U L L IF = A C A C A C A C A C A C A C A C The following frequency sets based on these setups were used. Frequency Set: 11 Setup file default. Used pcal sets: 1 LO sum= 8391.49 8391.49 8391.49 8391.49 8407.49 8407.49 8407.49 8407.49 8423.49 8423.49 8423.49 8423.49 8439.49 8439.49 8439.49 8439.49 BBC fr= 708.51 708.51 708.51 708.51 692.51 692.51 692.51 692.51 676.51 676.51 676.51 676.51 660.51 660.51 660.51 660.51 Bandwd= 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 Matching frequency sets: 11 The following pulse cal sets were used with this setup: Pulse cal detection set: 1 PCAL = 1MHZ PCALXB1= S1 S3 S5 S7 S9 S11 S13 S15 PCALXB2= S2 S4 S6 S8 S10 S12 S14 S16 PCALFR1= 490 510 490 510 490 510 490 510 PCALFR2= 490 510 490 510 490 510 490 510 Track assignments are: track1= 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32 barrel=roll_off SOURCES USED IN RECORDING SCANS -- X band NME+FTP-FT Experiment Catalog positions marked with *. Precession of date coordinates is based on stop time of first scan. Names used in schedule marked with *. Short names used in VLA and SNAP files marked with +. Observation date used in B1950/J2000 coordinate conversion (PRECDATE): 1979.900 No adjustments are made for rates (DRA, DDEC). Scan hours are for recording scans only. Baseline hours are only counted for scans above horizon at both ends. Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * J1751+0939 17 49 10.387929 * 17 51 32.818572 17 52 11.762260 0.10 1749+096 09 39 42.82574 * 09 39 00.72829 09 39 06.27166 0.10 J1751+09 /aps3/sched10.2/catalogs/sources.vlba rfc_2012b Petrov, 2012, unpublished 133560 observations 0.250 scan and 19.500 baseline hours in setup: sess313.X512 Frequency sets (dups not shown): 1 2 3 4 5 6 7 10 11 12 13 * J1850+2825 18 48 29.069767 * 18 50 27.589825 18 51 00.058301 0.16 1848+283 28 21 38.48500 * 28 25 13.15523 28 26 35.21469 0.19 J1850+28 /aps3/sched10.2/catalogs/sources.vlba rfc_2012b Petrov, 2012, unpublished 71 observations 0.283 scan and 22.100 baseline hours in setup: sess313.X512 Frequency sets (dups not shown): 1 2 3 4 5 6 7 10 11 12 13 * J1925+2106 19 23 49.792391 * 19 25 59.605354 19 26 35.488565 0.11 1923+210 21 00 23.30482 * 21 06 26.16190 21 08 28.42838 0.10 J1925+21 /aps3/sched10.2/catalogs/sources.vlba rfc_2012b Petrov, 2012, unpublished 32646 observations 1.067 scan and 70.050 baseline hours in setup: sess313.X512 Frequency sets (dups not shown): 1 2 3 4 5 6 7 10 11 12 13 * J1931+2243 19 29 16.894885 * 19 31 24.916779 19 32 00.333106 0.11 1929+226 22 37 06.35047 * 22 43 31.25849 22 45 40.08861 0.10 J1931+22 /aps3/sched10.2/catalogs/sources.vlba rfc_2012b Petrov, 2012, unpublished 3020 observations 0.750 scan and 58.500 baseline hours in setup: sess313.X512 Frequency sets (dups not shown): 1 2 3 4 5 6 7 10 11 12 13 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) J1751+0939 54.0 J1850+2825 75.1 J1925+2106 79.4 J1931+2243 81.2 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