COVER INFORMATION Station: WSTRBORK (Code Wb ) 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 WSTRBORK (Code Wb ) 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: 311.49 311.49 311.49 311.49 327.49 327.49 327.49 327.49 343.49 343.49 343.49 343.49 359.49 359.49 359.49 359.49 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 13 51 52 25.5 108.8 -4.0 0.0 0 0 10 30 00 10 35 00 =1749+096 13 56 53 26.2 109.9 -3.9 0.0 300 19 10 30 04 10 36 00 J1751+0939 13 57 53 26.3 110.2 -3.9 0.0 49 19 10 36 00 10 41 00 =1749+096 14 02 54 27.0 111.3 -3.8 0.0 300 39 10 36 04 10 42 00 J1751+0939 14 03 54 27.2 111.5 -3.8 0.0 49 39 10 42 00 10 47 00 =1749+096 14 08 54 27.9 112.7 -3.7 0.0 300 58 10 42 04 10 49 00 J1925+2106 14 10 55 23.3 85.3 -5.3 0.0 29 58 10 49 00 10 51 00 =1923+210 14 12 55 23.6 85.7 -5.2 0.0 120 66 10 49 04 10 51 00 J1925+2106 14 12 55 23.6 85.7 -5.2 0.0 -10 66 No stop 10 53 00 =1923+210 14 14 55 23.9 86.1 -5.2 0.0 110 74 10 51 04 10 54 00 J1931+2243 14 15 56 24.5 84.1 -5.3 0.0 42 74 10 54 00 10 55 30 =1929+226 14 17 26 24.7 84.4 -5.2 0.0 90 79 10 54 04 10 55 30 J1925+2106 14 17 26 24.3 86.6 -5.2 0.0 -18 79 No stop 10 57 30 =1923+210 14 19 26 24.6 87.0 -5.1 0.0 102 87 10 55 34 10 58 30 J1931+2243 14 20 26 25.2 85.0 -5.2 0.0 42 87 10 58 30 11 00 00 =1929+226 14 21 57 25.4 85.3 -5.2 0.0 90 93 10 58 34 11 00 00 J1925+2106 14 21 57 25.0 87.5 -5.1 0.0 -18 93 No stop 11 02 00 =1923+210 14 23 57 25.3 87.9 -5.0 0.0 102 101 11 00 04 11 03 00 J1931+2243 14 24 57 25.8 85.9 -5.1 0.0 42 101 11 03 00 11 04 30 =1929+226 14 26 27 26.1 86.2 -5.1 0.0 90 106 11 03 04 11 04 30 J1925+2106 14 26 27 25.7 88.4 -5.0 0.0 -18 106 No stop 11 06 30 =1923+210 14 28 28 26.0 88.8 -5.0 0.0 102 114 11 04 34 11 07 30 J1931+2243 14 29 28 26.5 86.7 -5.0 0.0 42 114 11 07 30 11 09 00 =1929+226 14 30 58 26.8 87.0 -5.0 0.0 90 120 11 07 34 11 09 00 J1925+2106 14 30 58 26.3 89.3 -4.9 0.0 -18 120 No stop 11 11 00 =1923+210 14 32 58 26.6 89.7 -4.9 0.0 102 128 11 09 04 Schedule for WSTRBORK (Code Wb ) 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 14 33 59 27.2 87.6 -5.0 0.0 42 128 11 12 00 11 13 30 =1929+226 14 35 29 27.4 87.9 -4.9 0.0 90 134 11 12 04 11 13 30 J1925+2106 14 35 29 27.0 90.2 -4.9 0.0 -18 134 No stop 11 15 30 =1923+210 14 37 29 27.3 90.6 -4.8 0.0 102 141 11 13 34 11 16 30 J1931+2243 14 38 29 27.9 88.5 -4.9 0.0 42 141 11 16 30 11 18 00 =1929+226 14 40 00 28.1 88.8 -4.9 0.0 90 147 11 16 34 11 18 00 J1925+2106 14 40 00 27.7 91.1 -4.8 0.0 -18 147 No stop 11 20 00 =1923+210 14 42 00 28.0 91.5 -4.7 0.0 102 155 11 18 04 11 21 00 J1931+2243 14 43 00 28.6 89.4 -4.8 0.0 42 155 11 21 00 11 22 30 =1929+226 14 44 30 28.8 89.7 -4.8 0.0 90 161 11 21 04 11 22 30 J1925+2106 14 44 30 28.4 92.0 -4.7 0.0 -18 161 No stop 11 24 30 =1923+210 14 46 31 28.7 92.4 -4.7 0.0 102 168 11 22 34 11 25 30 J1931+2243 14 47 31 29.2 90.3 -4.7 0.0 42 168 11 25 30 11 27 00 =1929+226 14 49 01 29.5 90.6 -4.7 0.0 90 174 11 25 34 11 27 00 J1925+2106 14 49 01 29.1 92.9 -4.6 0.0 -18 174 No stop 11 29 00 =1923+210 14 51 01 29.4 93.3 -4.6 0.0 102 182 11 27 04 11 30 00 J1931+2243 14 52 02 29.9 91.2 -4.7 0.0 42 182 11 30 00 11 31 30 =1929+226 14 53 32 30.2 91.5 -4.6 0.0 90 188 11 30 04 11 31 30 J1925+2106 14 53 32 29.7 93.8 -4.6 0.0 -18 188 No stop 11 33 30 =1923+210 14 55 32 30.0 94.2 -4.5 0.0 102 195 11 31 34 11 34 30 J1931+2243 14 56 32 30.6 92.1 -4.6 0.0 42 195 11 34 30 11 36 00 =1929+226 14 58 03 30.8 92.4 -4.6 0.0 90 201 11 34 34 11 36 00 J1925+2106 14 58 03 30.4 94.8 -4.5 0.0 -18 201 No stop 11 38 00 =1923+210 15 00 03 30.7 95.2 -4.4 0.0 102 209 11 36 04 11 39 00 J1931+2243 15 01 03 31.3 93.0 -4.5 0.0 42 209 11 39 00 11 40 30 =1929+226 15 02 33 31.5 93.4 -4.5 0.0 90 215 11 39 04 11 40 30 J1925+2106 15 02 33 31.1 95.7 -4.4 0.0 -18 215 No stop 11 42 30 =1923+210 15 04 34 31.4 96.1 -4.4 0.0 102 223 11 40 34 11 43 30 J1931+2243 15 05 34 32.0 94.0 -4.4 0.0 42 223 11 43 30 11 45 00 =1929+226 15 07 04 32.2 94.3 -4.4 0.0 90 228 11 43 34 Schedule for WSTRBORK (Code Wb ) 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 15 07 04 31.8 96.6 -4.3 0.0 -18 228 No stop 11 47 00 =1923+210 15 09 04 32.1 97.1 -4.3 0.0 102 236 11 45 04 11 48 00 J1931+2243 15 10 05 32.6 94.9 -4.4 0.0 42 236 11 48 00 11 49 30 =1929+226 15 11 35 32.9 95.2 -4.3 0.0 90 242 11 48 04 11 49 30 J1925+2106 15 11 35 32.4 97.6 -4.3 0.0 -18 242 No stop 11 51 30 =1923+210 15 13 35 32.7 98.0 -4.2 0.0 102 250 11 49 34 11 52 30 J1931+2243 15 14 35 33.3 95.8 -4.3 0.0 42 250 11 52 30 11 54 00 =1929+226 15 16 06 33.5 96.2 -4.3 0.0 90 255 11 52 34 11 54 00 J1925+2106 15 16 06 33.1 98.6 -4.2 0.0 -18 255 No stop 11 56 00 =1923+210 15 18 06 33.4 99.0 -4.1 0.0 102 263 11 54 04 11 57 00 J1931+2243 15 19 06 34.0 96.8 -4.2 0.0 42 263 11 57 00 11 58 30 =1929+226 15 20 36 34.2 97.1 -4.2 0.0 90 269 11 57 04 11 58 30 J1925+2106 15 20 36 33.8 99.5 -4.1 0.0 -18 269 No stop 12 00 30 =1923+210 15 22 37 34.1 100.0 -4.1 0.0 102 277 11 58 34 12 01 30 J1931+2243 15 23 37 34.7 97.8 -4.1 0.0 42 277 12 01 30 12 03 00 =1929+226 15 25 07 34.9 98.1 -4.1 0.0 90 283 12 01 34 12 03 00 J1925+2106 15 25 07 34.5 100.5 -4.0 0.0 -18 283 No stop 12 05 00 =1923+210 15 27 07 34.8 100.9 -4.0 0.0 102 290 12 03 04 12 06 00 J1931+2243 15 28 07 35.3 98.7 -4.1 0.0 42 290 12 06 00 12 07 30 =1929+226 15 29 38 35.6 99.0 -4.0 0.0 90 296 12 06 04 12 07 30 J1925+2106 15 29 38 35.1 101.5 -3.9 0.0 -18 296 No stop 12 09 30 =1923+210 15 31 38 35.4 101.9 -3.9 0.0 102 304 12 07 34 12 10 30 J1931+2243 15 32 38 36.0 99.7 -4.0 0.0 42 304 12 10 30 12 12 00 =1929+226 15 34 08 36.2 100.0 -4.0 0.0 90 310 12 10 34 12 12 00 J1925+2106 15 34 08 35.8 102.5 -3.9 0.0 -18 310 No stop 12 14 00 =1923+210 15 36 09 36.1 102.9 -3.8 0.0 102 317 12 12 04 12 15 00 J1931+2243 15 37 09 36.7 100.7 -3.9 0.0 42 317 12 15 00 12 16 30 =1929+226 15 38 39 36.9 101.0 -3.9 0.0 90 323 12 15 04 12 16 30 J1925+2106 15 38 39 36.5 103.5 -3.8 0.0 -18 323 No stop 12 18 30 =1923+210 15 40 40 36.7 104.0 -3.8 0.0 102 331 12 16 34 Schedule for WSTRBORK (Code Wb ) 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 15 41 40 37.4 101.7 -3.8 0.0 42 331 12 19 30 12 21 00 =1929+226 15 43 10 37.6 102.0 -3.8 0.0 90 337 12 19 34 12 21 00 J1925+2106 15 43 10 37.1 104.5 -3.7 0.0 -18 337 No stop 12 23 00 =1923+210 15 45 10 37.4 105.0 -3.7 0.0 102 344 12 21 04 12 24 00 J1931+2243 15 46 10 38.0 102.7 -3.8 0.0 42 344 12 24 00 12 25 30 =1929+226 15 47 41 38.2 103.0 -3.7 0.0 90 350 12 24 04 12 25 30 J1925+2106 15 47 41 37.8 105.6 -3.6 0.0 -18 350 No stop 12 27 30 =1923+210 15 49 41 38.1 106.0 -3.6 0.0 102 358 12 25 34 12 28 30 J1931+2243 15 50 41 38.7 103.7 -3.7 0.0 42 358 12 28 30 12 30 00 =1929+226 15 52 11 38.9 104.1 -3.7 0.0 90 364 12 28 34 12 30 00 J1925+2106 15 52 11 38.4 106.6 -3.6 0.0 -18 364 No stop 12 32 00 =1923+210 15 54 12 38.7 107.1 -3.5 0.0 102 372 12 30 04 12 33 00 J1931+2243 15 55 12 39.3 104.8 -3.6 0.0 42 372 12 33 00 12 34 30 =1929+226 15 56 42 39.6 105.1 -3.6 0.0 90 377 12 33 04 12 34 30 J1925+2106 15 56 42 39.1 107.7 -3.5 0.0 -18 377 No stop 12 36 30 =1923+210 15 58 42 39.4 108.2 -3.5 0.0 102 385 12 34 34 12 37 30 J1931+2243 15 59 43 40.0 105.8 -3.5 0.0 42 385 12 37 30 12 39 00 =1929+226 16 01 13 40.2 106.2 -3.5 0.0 90 391 12 37 34 12 39 00 J1925+2106 16 01 13 39.7 108.8 -3.4 0.0 -18 391 No stop 12 41 00 =1923+210 16 03 13 40.0 109.2 -3.4 0.0 102 399 12 39 04 12 42 00 J1931+2243 16 04 13 40.6 106.9 -3.5 0.0 42 399 12 42 00 12 43 30 =1929+226 16 05 44 40.9 107.2 -3.4 0.0 90 404 12 42 04 12 43 30 J1925+2106 16 05 44 40.4 109.8 -3.3 0.0 -18 404 No stop 12 45 30 =1923+210 16 07 44 40.6 110.3 -3.3 0.0 102 412 12 43 34 12 46 30 J1931+2243 16 08 44 41.3 107.9 -3.4 0.0 42 412 12 46 30 12 48 00 =1929+226 16 10 14 41.5 108.3 -3.4 0.0 90 418 12 46 34 12 48 00 J1925+2106 16 10 14 41.0 110.9 -3.3 0.0 -18 418 No stop 12 50 00 =1923+210 16 12 15 41.3 111.4 -3.2 0.0 102 426 12 48 04 12 51 00 J1931+2243 16 13 15 41.9 109.0 -3.3 0.0 42 426 12 51 00 12 52 30 =1929+226 16 14 45 42.2 109.4 -3.3 0.0 90 432 12 51 04 Schedule for WSTRBORK (Code Wb ) 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 16 14 45 41.6 112.1 -3.2 0.0 -18 432 No stop 12 54 30 =1923+210 16 16 45 41.9 112.6 -3.2 0.0 102 439 12 52 34 12 55 30 J1931+2243 16 17 46 42.6 110.1 -3.2 0.0 42 439 12 55 30 12 57 00 =1929+226 16 19 16 42.8 110.5 -3.2 0.0 90 445 12 55 34 12 57 00 J1925+2106 16 19 16 42.3 113.2 -3.1 0.0 -18 445 No stop 12 59 00 =1923+210 16 21 16 42.5 113.7 -3.1 0.0 102 453 12 57 04 13 00 00 J1931+2243 16 22 16 43.2 111.3 -3.2 0.0 42 453 13 00 00 13 01 30 =1929+226 16 23 47 43.4 111.6 -3.1 0.0 90 459 13 00 04 13 01 30 J1925+2106 16 23 47 42.9 114.4 -3.0 0.0 -18 459 No stop 13 03 30 =1923+210 16 25 47 43.2 114.9 -3.0 0.0 102 466 13 01 34 13 04 30 J1931+2243 16 26 47 43.8 112.4 -3.1 0.0 42 466 13 04 30 13 06 00 =1929+226 16 28 17 44.1 112.8 -3.1 0.0 90 472 13 04 34 13 07 00 J1925+2106 16 29 17 43.6 115.8 -3.0 0.0 42 472 13 07 00 13 09 00 =1923+210 16 31 18 43.9 116.3 -2.9 0.0 120 480 13 07 04 13 11 00 J1850+2825 16 33 18 54.8 120.4 -2.3 0.0 77 480 13 11 00 13 17 00 =1848+283 16 39 19 55.6 122.3 -2.2 0.0 360 503 13 11 04 13 18 00 J1850+2825 16 40 19 55.7 122.6 -2.2 0.0 49 503 13 18 00 13 23 00 =1848+283 16 45 20 56.3 124.2 -2.1 0.0 300 523 13 18 04 13 24 00 J1850+2825 16 46 20 56.5 124.5 -2.1 0.0 49 523 13 24 00 13 30 00 =1848+283 16 52 21 57.2 126.5 -2.0 0.0 360 546 13 24 04 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: wb_x Wild guess from SX PC-Sched assuming high patch Setup group: 7 Station: WSTRBORK 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= 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 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 = 2 1 2 1 4 3 4 3 6 5 6 5 8 7 8 7 BBC SB= L L U U L L U U L L U U L L U U IF = 2N 1N 2N 1N 2N 1N 2N 1N 2N 1N 2N 1N 2N 1N 2N 1N The following frequency sets based on these setups were used. Frequency Set: 10 Setup file default. 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= 311.49 311.49 311.49 311.49 327.49 327.49 327.49 327.49 343.49 343.49 343.49 343.49 359.49 359.49 359.49 359.49 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: 10 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