Voyager Low Field Magnetometer Summary Record Format Record Components 1. Header block - 32 words 2. MAG data block - 496 words 3. SEDR data block - 40 words --- 568 words total (32 bit words) Header Block Description word type description ---- ---- ----------- 1 A*4 Data Identifier ("HDR1" or "LFM ") 2 A*4 Telemetry Format ("ENG ","CR-1","CR-2","CR-3","CR-4","CR-5", "CR-6","CR-7","CR5A","GS-2","GS-3","GS-4", "GS-6","GS-7","GS-8","GS10","G10A","OC-1", "OC-2","UV5A","****") 3 A*4 S/C Identification ("FLT1","FLT2","PTM ","SIM1","SIM2","UKWN") 4 I*2 Year of Data 4.5 I*2 Day of Year (Jan. 1 = 1) 5 I*2 Hour of Day 5.5 I*2 Minute of Hour 6 I*2 Second of Minute 6.5 I*2 Millisecond of Second 7 R*8 Decimal Day of Year (Jan. 1 = 0) 9 R*8 Decimal Day Count since August 20, 1977 11 A*4 Time Type (SCET = spacecraft event time, ERTS = start earth receive time) 12 R*4 Time period of data block (48 sec) 13 I*2 48 Minute Counter (2**16 sequence counter of data at time of telemetry readout.) 13.5 I*2 48 Second Counter (Modulo 60 sequence counter of data at time of telemetry readout.) 14 I*2 60 Millisecond Counter (Line counter of data at time of telemetry readout.) 14.5 I*2 Spare 15 Z*4 MAG Status Word 16 Z*4 MAG Command Word 17 I*2 Data Identifier (LFM=2,HDR1=8) 17.5 I*2 Data Rate (GS-X=0,CR-1=1,CR-2=2,CR-3=3,CR-4=4,CR-5=5, CR-6=6,CR-7=9,ENG=8,CR5A=13,UV5A=13) * CR5A and UV5A are both VIM-5 modes 18 I*4 Spare 19 A*8 Data Confidence Flag (indicates reduced data confidence due to software/hardware intervention) 21 I*4 Spare 22 I*4 Spare 23 I*4 Spare 24 I*4 Spare 25 I*4 Spare 26 I*4 Spare 27 I*4 Spare 28 I*4 Spare 29 I*4 Spare 30 I*2 Number of primary data words 30.5 I*2 Number of secondary data words 31 I*2 Number of primary full words 31.5 I*2 Number of secondary full words 32 I*2 Record number in file 32.5 I*2 Number of words remaining in logical record MAG Data Block Description 48 second averages ------------------ 33 R*4 F1: 48 second average of 9.6 second norms (nT) 34 R*4 F2: Norm of 48 second component averages (nT) 35 R*4 Latitudinal field angle = arcsin(B1/F2) (degrees) 36 R*4 Longitudinal field angle = 180 - atan(B2,-B1) (degrees) 37 R*4 B1: 48 second average of first 9.6 second averaged component (nT) 38 R*4 B2: 48 second average of second 9.6 second averaged component (nT) 39 R*4 B3: 48 second average of third 9.6 second averaged component (nT) 40 R*4 RMS of B1 (nT) 41 R*4 RMS of B2 (nT) 42 R*4 RMS of B3 (nT) 43 I*4 Number of 9.6 averages per 48 second average (0