February 1992
THIS FILE HAS BEEN FULLY UPDATED TO REFLECT EXACTLY WHAT HAPPENED DURING THE
FLY-BY PERIOD.
1st Feb
032.12:00 STO 42 RAR switching commences.
032.12:05 SIM HET/HFT commanding (d1-D3, S HV off, F1 stepped, F2 high) BAM-I SPO to 195 deg, aperture to maximum.
032.17:00 BAM-I aperture increase.
032.21:03 BAM-E to RS mode.
032.21:22 HED pre-Jupiter calibration.
DSS 14 used instead of DSS 12 because of transmitter problem.
2nd Feb
Magnetopause crossing.
033.17.31 Bow shock crossing. BAM & HED PIs informed immediately.
033.20:47 BAM-I to FG mode.
033.23:27 BAM-I matrix and angle offset changes commence.
3rd Feb
034.00:13 GRU DUST channeltron voltage changes.
034.00:18 SIM HET reset.
034.00:15 (ETT) BAM TT load sent by mistake.
034.01:27 (ETT) RESET TTQ sent to cancel wrong BAM TT load.
034.02:16 (ETT) Ranging TT commands reloaded.
034.03:24 BAM-I matrix and angle offset changes.
034.11:37 STO PFR and FES reset.
034.11:20 (ETT) Beginning of 1x70m pass per day.
034.18:00 BAM magnetosphere region 4.1 commands commence.
034.22:17 STO FES update.
034.23:26 STO 42 command sent too early - STO sequence probably lost.
No damage to instrument.
4th Feb
035.00:00 (ETT) CMD MOD off - DSS 61 reports CPA problem.
035.00:21 (ETT) CMD MOD on.
035.00:25 (ETT) Ranging TT load delayed by 10 minutes - not critical.
035.01:43 STO FES update.
035.04:00 Revised STO 4 operations commence.
035.20:13 (ERT) S134 OOL - TT buffer overfilled. BAM sequence truncated by
two commands.
035.22:30 (ETT) 2 BAM commands sent to complete sequence.
035.22:30 GLG change TAC slope.
5th Feb Earth pointing manoeuvre.
036.00:00 Revised STO 4 operations end.
036.00:15 (ETT) Ranging TT load delayed due to commanding problems with CPA
at DSS 61.
036.00:48 (ETT) CPA problem solved - CMD MOD on
036.00:52 (ETT) BAM TT load sent. Delayed by 17 minutes - no impact.
036.04:00 New STO 4 operations commence.
036.12:22 LET Detector switch off.
036.12:23 KET HV2 step 0
036.12:29 KET HV2 off.
036.13:00 KET FM3 on.
036.14:55 GLG 3 Change auxiliary sector1 definition to 3, 4, 5.
036.15:30 STO 11 sounder passive to active mode commanding commences.
036.17:00 Last manoeuvre before S-Band ops - executed nominally.
036.19:08 Deschedule REC for S-Band switch on.
036.19:09 +/- wing heaters off.
036.22:33 (ERT) Verify REC scheduled - end of S-Band switch on.
036.23:34 (ETT) Delayed ranging TT commands loaded.
6th Feb
037.00:00 New STO 4 operations end.
037.02:00 New STO 4 operations commence.
037.06:30 GLG - critical temperature decreasing following S-Band on.
B004=-7.7 degC, B005=-18.8 degC. Other platform temperatures
decreasing as predicted.
037.12:07 CMD verification failure on BAM region 4 TT load. Lost
address error message on S062. BAM sequence missed.
037.12:00 New STO 4 operations commence.
037.12:09 LAN G011 breifly OOL at 150.8 mA. Probably due to high
count rates.
037.12:55 (ETT) Beginning of continuous 70m coverage.
037.13:00 (ERT) KEP F008 OOL at -33.5 degC. Informed PI. No action required
037.18:00 (ETT) HUS off, LAN cover close TTs loaded (038.22:26).
7th Feb ??? STO WFA closest approach mode.
038.00:00 New STO 4 operations end.
038.04:00 HED VHM inhibit ignition, FGM to range 2.
038.05:00 BAM magnetoshpere region 4.2 commands begin.
038.11:15 Revised SIM HET commands.
038.11:45 STO 30 Cal by DPU.
038.11:58 LAN all strobes and antis high.
038.11:58 KEP Spec Alt, T2 fixed, HMOD.
038.13:27 GLG MCP bias changes and detector switch offs. (CR#89)
038.14:30 (ERT) GLG critial temperatures drop due to CR #89 B004=-10.5 degC,
B005=-21.4 degC at 17:30.
038.15:45 STO 6 sounder interval to 90 minutes.
038.15:58 SIM LET detector switch off.
038.18:56 GRU DUST configuration.
038.19.56 GRU DUST configuration.
038.20:56 GRU DUST configuration.
038.21:56 LAN cover close 30 minutes early.
038.22:13 HUS switch off 13 minutes early.
038.23:18 GLG all detectors on - temperatures rise.
8th Feb
039.01.50 (ert) KEP OOL (F003 > 126.4mV). Could not contact PI. CRPs KEP1
and KEP33 implemented.
039.02:54 BAM-E HV off.
039.03:04 KEP GAS/EPAC power off.
039.04:11 BAM-I HV off.
039.04:17 BAM magnetoshpere region 4.2 commands end.
039.04:48 STO 28 enter WFA CA mode.
039.06:27 GLG MCP level change.
039.08:01 SIM HFT F1 stepped, F2 high, F2 prescale.
039.08:05 HED FGM switch to range 3.
039.09:54 (ERT) TLM drop - DSS 14 reports CMC problem. No commanding
possible.
039.10:23 (ETT) STO 7 Antenna switching commands missed.
039.10:55 (ERT) TLM returns - s/c OK. Still no commanding.
039.11:23 (ETT) STO 7 Antenna switching commands missed.
039.12:06 (ETT) CMD MOD on at DSS 14.
039.12:09 (ETT) STO 7 Antenna commands sent.
039.12:21 (ERT) Uplink transfer DSS14 to 43 finally completed.
039.12:38 (ERT) Data from JUPITER CLOSEST APPROACH.
039.14:02 STO 18 RAR ITD measurments commence.
039.14:07 HED FGM switch to range 2.
039.14:24 SIM parameter K038 OOL (> 98 nA). Investigator informed. No
action necessary.
039.18:02 STO 18 RAR ITD return to base mode.
039.19:13 STO 28 return from WFA CA mode.
039.20:20 (ETT) STO 7 commands sent 5 minutes early to avoid station tuning -
no impact.
039.21:15 STO 8 QT noise measurement mode begins.
039.22:03 SIM HFT F1 stepped, F2 high.
039.22:15 STO 8 QT noise measurement mode ends.
039.23:32 LAN post JCA switch on sequence begins.
039.23:39 LAN strobes and antis low.
039.23:56 HUS post JCA switch on sequence begins.
9th Feb
040.00:38 SIM HFT to STDMOD.
040.01:02 BAM-I HV switch on.
040.01:09 KEP GAS/EPAC switch on.
040.01:12 GLG MCP level, detector changes.
040.01:50 BAM-E HV switch on.
040.03:00 GRU DUST configuration.
040.03:14 HUS HV off due to high count rates.
040.02:41 (ETT) Wrong command sent - sent Z121 HED 1/3R ON instead of
KEP Z021 command.
040.03:28 KEP RAM load commences.
040.04:00 GRU DUST configuration.
040.04:00 BAM sub-region 6.4 commanding begins.
040.04:28 SIM HET reset.
040.05:00 GRU DUST configuration.
040.06:21 KEP EPAC RAM Dump starts.
040.06:45 (ERT) Z121 command error discovered - informed HED PI.
040.06:54 (ETT) Z122 HED 1/3R OFF command sent to return HED instrument to
nominal configuration.
040.07:30 BAM sub-region 6.5 commanding begins.
040.08:39 KEP mode change.
040.11:58 LAN strobe, antis low
040.11:59 KEP HMOD, Spec Alt, Tel Alt.
040.12:00 BAM sub-region 6.6 commanding begins.
040.17:37 HUS HV switch on - sent ETT intead of ERT
040.18:00 SIM LET HV on.
040.18:00 BAM sub-region 6.7 commanding begins.
040.18:38 S-band off 40 hours early (originally 042.10.05).
040.20:05 HED VHM ignition reenable, FGM range change.
040.20:09 +/- wing heaters on.
040.20:12 HUS switch off.
040.23:22 HUS switch on sequence.
10th Feb
041.00:30 (ERT) STO team decision not to use attenuator.
041.02:04 HUS switch off.
041.03:00 BAM sub-region 6.8 commanding begins.
041.05:25 (ETT) End of continuous 70m coverage - return to 1x70m pass per day
041.16:22 HUS switch on.
041.16:00 (ERT) Cease magnetosphere sub-region 6 commanding.
041.17:37 GRU HV on and test pulse.
041.19:52 SIM LET reset.
041.19:58 BAM-I Region 7 commanding commences.
041.20:24 SIM KET reconfiguration.
041.20:49 SIM KET HV on.
041.22:50 HUS switch off.
041.22:54 SIM KET HV Step 1 and 2.
11th Feb
042.04:13 BAM-I reconfiguration for magnetosheath
042.15:22 HUS switch on sequence.
042.17:00 First post Jupiter manoeuvre - routine slew. Executed
nominally. Earth off-pointing reduced.
042.22:12 HUS switch off.
12th Feb
043.10:40 (ERT) Disk failure on UMCS Prime machine. S/w support called out.
043.11:07 STO PFR in freeze mode.
043.12:07 STO PFR in non-freeze mode.
043.12:25 (ETT) HED Post-flyby checkout postponed as interesting data still
being received.
043.15:23 HUS switch on sequence.
043.18:14 BAM-I Reconfiguration for magnetosheath.
043.19:30 (ERT) Circuit breaker failure on UMCS backup machine. NO MACHINE
OPERABLE.
043.19:45 (ERT) Prime UMCS machine brought back up on 1 disk only.
043.20:20 (ERT) Backup UMCS machine brought back up.
043.22:48 (ERT) Prime and Backup UMCS machines restarted. Rebuilding of
history files commences.
13th Feb
044:00:10 BAM-I reconfigurationfor magnetosheath.
044.01:49 GLG TAC gain to normal.
044.17:11 HUS medium level threshold change.
044.22:00 (ETT) HUS calibration.
044.23:41 Manoeuvre commands loaded with wrong timetag for Z194 CE-1 ON
command.
14th Feb
045.02:25 (ERT) Z194 timetag error discovered.
045.02:37 BAM-I reconfiguration for magnetosheath.
045.03:01 (ETT) Z194 command sent with correct timetag.
045.08:00 Revised STO antenna switching commences.
045.15:55 GLG 3 sector 1 def to 4.
045.15:52 (ETT) Manoeuvre commands reloaded.
045.17:00 Manoeuvre commences.
045.17:21 Manoeuvre completed nominally.
045.19:26 (ETT) STO sequence transmitted 12 minutes early. Investigator
informed - no damage to instrument.
045.21:07 BAM-I reconfiguration for magnetosheath.
045.21:12 HUS HV, calibration and threshold changes.
15th Feb
046.00:58 BAM-I reconfiguration for magnetosheath.
046.03:12 HUS parameters E045 & E046 briefly OOL (2 formats). No
action taken as bad TM suspected.
046.03:52 BAM-I Matrix 5 to Matrix 3.
046.03:57 HUS parameters E045 & E046 OOL (5 formats). Continuing to
monitor.
046.05:00 (ERT) HUS PI contacted regarding OOLs. No urgent action.
046.05:01 BAM-I Matrix 3 to Matrix 2.
046.18:42 HUS thresholds to max and calibration.
16th Feb
047.10:37 KEP cmd Mod 1, DC L, DA L, ADC1.
047.11:37 KEP inflight calibration.
047.12:00 New STO 4 operations end.
047.12:00 STO post flyby mode.
047.12:47 KEP cnd Mod 0, DC L, DA L, ADC1.
047.15:00 KEP GAS command sequence begins.
047.18:06 BAM-I Matrix 2 to Matrix 0.
047.21:22 HUS HV, calibration and threshold changes.
047.22:12 BAM-I reconfiguration for magnetosheath.
17th Feb
048.01:54 BAM-I Track Mode.
048.04:00 KEP GAS post-Jupiter scan.
048.10:37 Recommence STO daily commanding.048.01:54 BAM-I Track Mode.
048.20:32 HUS LLD threshold changes.
18th Feb
049.03:32 Revised STO RAR switching commences.
049.08:24 KEP GAS command sequence ends.
049.08:37 BAM-I to standard configuration.
049.13:22 BAM-I, BAM-E calibration.
049.16:00 SIM LET discriminator test starts.
049.16:40 SIM LET linearity test starts.
049.17:00 LAN calibration.
049.21:00 KEP GAS data off.
19th Feb
050.04:00 SIM KEP calibration
050.08:55 (ETT) CMD MOD OFF for uplink receiver sweep test.
050.13:32 (ERT) Loss of downlink.
050.13:15 (ETT) CMD MOD ON following Uplink test.
050.14:14 (ERT) Receivers in lock - downlink restored. 42 minutes of
unrecoverable data.
050.14:07 Updated STO daily commanding sequences.
050.16:00 SIM HET calibration.
050.17:00 Routine slew manoeuvre.
Uplink sweep test to determine onboard receiver best-lock
frequencies. 45 minutes of data lost because ground receiver
did not maintain lock during sweep.
20th Feb
051.04:00 SIM AT calibration.
051.10:55 (ERT) Uplink Transfer at DSS 43 failed - came up LHCP instead of
RHCP.
051.12:10 (ERT) Spacecraft TLM drop due to non-coherency.
051.12:16 (ETT) STO sequence ommitted due to g/s problems.
051.12:20 (ETT) CMD MOD OFF, Transmitter off to reaquire.
051.12:35 (ETT) Transmitter on, 8 kW, RHCP.
051.12:41 (ETT) CMD MOD ON.
051.17:00 Final manoeuvre before S-Band switch on for 02.
051.18:02 +/- wing heaters off.
051.18:37 S-band on for 02 Gravity Wave Experiment.
051.20:00 XBS1+2 configuration.
051.22:00 Return to XBS1 only configuration.
21st Feb
052.03:07 HUS LLD thresholds.
052.06:10 (ETT) Beginning of continuous 70m coverage for Gravity Wave
Experiment.
052.18:41 (ERT) OOLs showing BAM-E instrument in sleep mode. PI and CoI
informed.
052.19:31 (ETT) BAM-E sleep mode due to glitch in sun sensor data - HV off
command sent.
052.21:56 CTU DUMP SPIN.
052.23:47 BAM-E reset to recover from sleep mode.
22nd Feb Continuous 70m coverage for GWE.
053.01:59 SAA fail deadband flag reset - failed due to glitch in sun
sensor data.
23rd Feb Continuous 70m coverage for GWE.
24th Feb Continuous 70m coverage for GWE.
055.15:37 KEP EPAC IFC.
25th Feb Continuous 70m coverage for GWE.
056.00:00 (ETT) All commands sent using ASW1 for day 92.056.
26th Feb Continuous 70m coverage for GWE.
057.00:00 (ETT) Return to commanding using ASW2.
057.15:45 HUS MLD threshold.
057.16:00 HED calibration.
057.23:14 GLG post-Jupiter reconfiguration.
27th Feb Continuous 70m coverage for GWE.
058.02:28 Tx2 Ranging off to improve Attitude determination.
058.07:12 Tx2 Ranging off to improve Attitude determination.
058.15:30 Bit rate to 128 bps.
058.14:30 STO heater off, catalyst bed heaters on for 02 manoeuvre 1.
058.15:59 STO heater on, catalyst bed heaters off.
058.16:00 02 M1 - slew around Sun at constant SAA commences.
058.16:25 02 M1 aborts on-board due to excursion outside lower SAA
deadband.
058.18:02 Bit rate returned to 1024 bps.
058.18:30 STO heaters off, catalyst bed heaters on for planned M2.
058.18:37 Bit rate to 256 bps.
058.18:40 Reset TT queue to cancel planned 02 M2.
058.19:06 STO heater on, catalyst bed heater off, CE-1 off commands
to abort planned 02 M2.
058.20:10 Bit rate to 1024 SCI bps.
Slew manoeuvre around Sun terminated early because 1.3 deg
solar aspect angle deadband transgressed. About one quarter
of the manoeuvre had taken place. This was due to thruster
centroid delay errors. Recovery action was taken: a slew to
1.5 deg SAA followed by the remainder of the slew around the
Sun. No slew to Earth path or trim manoeuvres were required.
28th Feb Continuous 70m coverage for GWE.
059.03:24 STO heater off, catalyst bed heaters on for new 02 M2.
059.04:16 Bit rate to 512 SCI bps.
059.04:29 STO heater on, catalyst bed heaters off.
059.04:29 New 02 M2 - slew away from lower SAA deadband commences.
059.04:35 02 M2 completed nominally.
059.05:29 STO heater off, catalyst bed heaters on for new 02 M2.
059.06:16 Bit rate to 128 SCI bps.
059.06:28 STO heaters on, catalyst bed heaters off.
059.06:29 New 02 M3 - slew around Sun at constant SAA commences.
059.07:35 02 M3 completed nominally.
059.07:54 SAA deadband fail detect flag reset, and new deadbands loaded
059.08:29 Bit rate to 1024 SCI bps.
059.08:29 STO heaters off, catalyst bed heaters on for planned 02 M4
(time-tagged).
059.08:33 SAA fail detect enabled and subsequent OOL - SAA outside new
limits.
059.08:57 STO heaters on, catalyst bed heater off, CE-1 off commands
sent to abort 02 M4.
059.21:51 Tx1 Coherent.
059.21:52 Tx2 Coherent.
29th Feb Continuous 70m coverage for GWE.
060.06:51 Tx2 Ranging resumes.
060.22:53 Revised STO RAR switching ends.