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VOYAGER

Voyager LECP Data Analysis Handbook

 

Data File Descriptions

 

FAT Record Description

 

FAT Header

 

This file is composed of 2800 byte records, sequential in time, with cadence equal to the stepping period of the LECP instrument. Each record consists of the following layout:

 

Bytes 1 - 200 Bytes 201 - 600 Bytes 601 - 800 Bytes 701 - 900 Bytes 901 - 2400 Bytes 2401 - 2800
KHED(100) R(100) IUNCS(100) NSAMP(100) IFILL(700) ISTP(100,2)
Integer*2 Real*4 Integer*2 Integer*2 Integer*2 Integer*2

 

In the FORTRAN programs of the VGER processing, the FAT record can be represented by the following labeled COMMON block and Type Declarations for the variables:

 

COMMON/FOUT/KHED,R,IUNCS,NSAMP,IFILL,ISTP
INTEGER*2 KHED100) !OUTPUT RECORD HEADER
INTEGER*2 IUNCS(100) !OUTPUT RECORD UNCS (64*PERCENT)
INTEGER*2 NSAMP(100) !OUTPUT REC. # OF BASIC ACCUM. INTERVAL
INTEGER*2 IFILL(700) !SPACE IN COMMON BLOCK FOR THE FLUXES
INTEGER*2 ISTP(100,2) !STARTING AND ENDING MOTOR POSITIONS
REAL*4 R(100) !OUTPUT RECORD COUNT RATES (C/SEC.)

 

Contents of KHED(100):

 

ITEM

NAME

TYPE

 DESCRIPTION

WORD

1

SCID

I*2

 SPACECRAFT IDENTIFICATION/MODE

1
    LEFT BYTE IS S/C ID. 0=VGR 2, 1=VGR 1. 
RIGHT BYTE IS MODE(HEX) A=GS3, 7=CR1, 1=CR2, 2=CR3,5=CR6,8=NE		  

2

DIR

I*2

 SCAN DIRECTION 1=INCR., -1=DECR.

2

3

ST01

I*2

 FIRST OCCURRENCE OF STATUS WORD 1

3

4

ST01

I*2

 LAST OCCURRENCE OF STATUS WORD 1

4

5

ST02

I*2

 FIRST OCCURRENCE OF STATUS WORD 2

5

6

ST02

I*2

 LAST OCCURRENCE OF STATUS WORD 2

6

7

ST03

I*2

 FIRST OCCURRENCE OF STATUS WORD 3

7

8

ST03

I*2

 LAST OCCURRENCE OF STATUS WORD 3

8

9

ST04

I*2

 FIRST OCCURRENCE OF STATUS WORD 4

9

10

ST04

I*2

 LAST OCCURRENCE OF STATUS WORD 4

10

11

ST05

I*2

 FIRST OCCURRENCE OF STATUS WORD 5

11

12

ST05

I*2

 LAST OCCURRENCE OF STATUS WORD 5

12

13

ST06

I*2

 FIRST OCCURRENCE OF STATUS WORD 6

13

14

ST06

I*2

 LAST OCCURRENCE OF STATUS WORD 6

14

15

MPOS

I*2

 MOTOR POSITION(0,1,2,3,4,5,6,7)

16

TTEMP

I*2

 TEL. TEMP, (128*CENT. DEG)(-9999 IF UNK.)

17

LOGT

I*2

 LOG AMP. TEMP. (128* CENT.DEG.)

17

18

TIMUNT

I*2

 BASIC ACCUM. TIME UNIT IN SECONDS FROM MRT

18

19

NGRP

I*2

 NUMBER OF RATE GROUPS IN THIS FORMAT

19

20

G18

 I*2 GROUP 18 I.D./SC EVENT TIME FLAG

20

21

ALTFLG

 I*2 FLAG FOR THE GS3 50-50 MODE 0=LEPT, 1=LEMPA

22

DATE

A*2

 FIRST TWO CHARACTERS OF PRODUCTION DATE

23

DATE

A*2

 PRODUCTION DATE (cont.)

24

DATE

A*2

 PRODUCTION DATE (cont.)

25

DATE

A*2

 PRODUCTION DATE (cont.)

26

DATE

A*2

 PRODUCTION DATE (cont.)

27

DATE

A*2

 PRODUCTION DATE (cont.)

28

RATE

I*2

 STEPPING RATE, SECONDS.

29

SPARE

I*2

  

30

ADFL

I*2

 FLAG=1 FOR DEAD TIME CORR. APPLIED (ALPHA)

31

BDFL

I*2

 FLAG=1 FOR DEAD TIME CORR. APPLIED (BETA)

32

ADVR

A*2

 TWO CHARACTERS FOR DEAD TIME VERSION USED (ALPHA)

33

BDVR

A*2

 TWO CHARACTERS FOR DEAD TIME VERSION USED (BETA)

34

SPARE

    

35

SECST

I*2

 16*AVG BEGIN TIME IN SECONDS

36

SECSP

I*2

 16*AVG END TIME IN SECONDS

36

37

M60F

I*2

 VALUE OF MOD 60 AT FIRST APPEARANCE

37

38

M60L

I*2

 VALUE OF MOD 60 AT LAST APPEARANCE

38

39

M16F

I*2

 VALUE OF MOD 2**16 AT FIRST APPEARANCE

39

40

M16L

I*2

 VALUE OF MOD 2**16 AT LAST APPEARANCE

40

41

SCETHS

I*2

 SPACECRAFT EVENT TIME HOUR AT START

41

42

SCETHE

I*2

 SPACECRAFT EVENT TIME HOUR AT END

42

43

SCETSS

I*2

 SPACECRAFT EVENT TIME SECOND AT START

43

44

SCETSE

I*2

 SPACECRAFT EVENT TIME SECOND AT END

44

45

SCETMS

I*2

 SPACECRAFT EVENT TIME MILLISECOND START

45

46

SCETME

I*2

 SPACECRAFT EVENT TIME MILLISECOND END

46

47

SCETYS

I*2

 SPACECRAFT EVENT TIME YEAR AT START

47

48

SCETYE

I*2

 SPACECRAFT EVENT TIME YEAR AT END

48

49

WYEAR

I*2

 AVG. WINDOW YEAR IF APPLICABLE.

50

WDAY

I*2

 AVG. WINDOW DAY IF APPLICABLE.

51

WHR

I*2

 AVG. WINDOW HOUR IF APPLICABLE.

52

WSEC

I*2

 AVG. WINDOW SECONDS IF APPLICABLE.

53

WINC

I*2

 100. AVG DURATION IN HOURS.

54

SPARE

 I*2  

55

SPARE

 I*2  

56

SPARE

 I*2  

57

SPARE

 I*2  

58

SPARE

 I*2  

59

SPARE

 I*2  

60

 S/C R I*2 JOVICENTRIC RADIAL DISTANCE IN UNITS OF 100*RJ

61

 S/C Lat I*2 JOVIMAGNETIC DIPOLE LATITUDE OF S/C IN 10*DEGREES

62

 S/C Long I*2 JOVIMAGNETIC DIPOLE LONGITUDE OF S/C IN 10*DEGREES

63

 S/C SIII Long   SYSTEM III LONG OF S/C IN 10*DEGREES

64

 Io SIII Long   SYSTEM III LONG OF IO IN 10*DEGREES

65

EU SIII Long

   SYSTEM III LONG OF EUROPA IN 10 * DEGREES

66

NAME

A*2

 INPUT FILENAME

67

NAME

A*2

 INPUT FILENAME (cont.)

68

NAME

A*2

 INPUT FILENAME (cont.)

69

NAME

A*2

 INPUT FILENAME (cont.)

70

 Bx   MAGNETIC FIELD X COMPONENT IN UNITS OF 10*GAMMA

71

 By   MAGNETIC FIELD Y COMPONENT IN UNITS OF 10*GAMMA

72

 Bz   MAGNETIC FIELD Z COMPONENT IN UNITS OF 10*GAMMA
 

 

   IF BY=BZ=32767 THEN BX IS THE MAGNITUDE OF THE FIELD  

73

L

   MAGNETIC FIELD L VALUE OF THE SPACECRAFT

74

SPARE

    

75

SPARE

    

76

SPARE

    

77

SPARE

    

78

SPARE

    

79

SPARE

    

80

PS 1

   SECTOR 1 PL0 PITCH ANGLE IN UNITS OF 10 *DEGREES

81

PS 2

   SECTOR 2 PL0 PITCH ANGLE IN UNITS OF 10 * DEGREES

82

PS 3

   SECTOR 3 PL0 PITCH ANGLE IN UNITS OF 10 * DEGREES

83

PS 4

   SECTOR 4 PL0 PITCH ANGLE IN UNITS OF 10 * DEGREES

84

PS 5

   SECTOR 5 PL0 PITCH ANGLE IN UNITS OF 10 * DEGREES

85

PS 6

   SECTOR 6 PL0 PITCH ANGLE IN UNITS OF 10 * DEGREES

86

PS 7

   SECTOR 7 PL0 PITCH ANGLE IN UNITS OF 10 * DEGREES

87

PS 8

   SECTOR 8 PL0 PITCH ANGLE IN UNITS OF 10 * DEGREES

88

PS 1

   SECTOR 1 OF P DELTA'  PITCH ANGLE IN UNITS OF 10 * DEGREES

89

PS 2

   SECTOR 2 OF P DELTA' PITCH ANGLE IN UNITS OF 10 * DEGREES

90

PS 3

   SECTOR 3 OF P DELTA' PITCH ANGLE IN UNITS OF 10 * DEGREES

91

PS 4

   SECTOR 4 OF P DELTA' PITCH ANGLE IN UNITS OF 10 * DEGREES

92

PS 5

   SECTOR 5 OF P DELTA' PITCH ANGLE IN UNITS OF 10 * DEGREES

93

PS 6

   SECTOR 6 OF P DELTA' PITCH ANGLE IN UNITS OF 10 * DEGREES

94

PS 7

   SECTOR 7 OF P DELTA'  PITCH ANGLE IN UNITS OF 10 * DEGREES

95

PS 8

   SECTOR 8 OF P DELTA'  PITCH ANGLE IN UNITS OF 10 * DEGREES

96

NAME

A*2

 OUTPUT FILENAME

97

NAME

A*2

 OUTPUT FILENAME (cont.)

98

NAME

A*2

 OUTPUT FILENAME (cont.)

99

NAME

A*2

 OUTPUT FILENAME (cont.)

100

SPARE

    

 

 

Next: FAT Tape Data Block

 

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Return to Voyager LECP Data Analysis Handbook Table of Contents.
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Updated 8/9/19, Cameron Crane

VOYAGER 1 ELAPSED TIME

--:--:--:--
Days: Hours: Minutes: Seconds

*Since official launch
September 5, 1977, 12:56:00:00 UTC

VOYAGER 2 ELAPSED TIME

--:--:--:--
Days: Hours: Minutes: Seconds

*Since official launch
August 20, 1977, 14:29:00:00 UTC

QUICK FACTS

Manufacturer: Voyagers 1 and 2 were built in the Jet Propulsion Laboratory in Southern California.

Mission Duration: 40+ years have elapsed for both Voyager 1 and Voyager 2 (both are ongoing).

Destination: Their original destinations were Saturn and Jupiter. Their current destination is interstellar space.