Fundamental Technologies

Voyager LECP Pages

Record and File Structure: Far Encounter
(applies to Voyager 1 Jupiter and Saturn, Voyager 2 Jupiter, Saturn, Uranus, and Neptune)

Table 1. File Names

Character # Meaning
1 “V” for Voyager
2 “1” or “2” for Voyager 1 or Voyager 2
3 and 4 Last 2 digits of Year of File Beginning (‘77’ = 1977)
5, 6, and 7 Day of Year for File Beginning (1 = January 1)
8 "A","B","C","D","E","F","G", or "H" for File Beginning Time of SCET Hour 0,3,6,9,12,15,18,21, respectively
9 and 10 “MG” identifying this file as LECP Far Encounter/Cruise Mode
11 and 12 “01” through “16” identifying which Far Encounter Cruise Rate Group is present (see table 3 below)
13, 14, 15, and 16 “.CSV” Identifying this file as Comma Separated Variable ASCII form with the first record containing column labels and all subsequent records to end of file having items as described in Table 2 below. Note that missing data is denoted in two ways--successive commas with no intervening space in the “counts” field denotes missing data. The corresponding “T_acc.” Field will show “0”.

Table 2. Record Field by Field Description

Column Number Contents Name Units
1 Year Year of Data Item Beginning
2 Day Day of Data Item Beginning (DOY 1=January 1)
3 Hour Hour of Data Item Beginning
4 Minute Minute of Data Item Beginning
5 Second Second of Data Item Beginning
6 STEP LECP Stepping Platform Position (0-7)
7 MOV. Motor Movement Flag (0=no movement, 1 = movement during accumulation)
8 Counts in Channel Counts per accumulation
9 T_acc. Accumulation time in second of above channel
10, 11, … Repeat for additional channels (see Table 3)

Table 3. Annotation of Field Contents

Group Col.# 1 Col.# 2 Col.# 3 Col.# 4 Col.# 5 Col.# 6 Col.# 7 Col.# 8 Col.# 9 Col.#10 Col.#11
1 PL01 PL02 PL03 EB04 EBP04            
2 EB01 EBP01 EB02 EBP02 EB03 EBP03 EG06        
3 A39 A33 P32 P31               
4 EG07 EG08 EG09 EB05 EBP05            
5 P1 E44 A3 P10              
6 PL04 PL08 AR E0 E1 E2 E3 E4 E5 AL P16
7 P11 P23 P27 A4              
8 A46 A13 M47 A17 A28 M38          
9 M35 PL05 PL06 PL07              
10 E45 ALAR? A12 A24              
11 M34 L5 L18 L14              
12 M6 M7 M19 H36              
13 H8 H43 M25 H9              
14 M29 H22 H26 H30              
15 AL01 AL02 E37 H21              
16 M15 M20                  

Note: Passbands and Geometrical Factors corresponding to each of the labels are given in the tables listed below.

Passbands and Geometrical Factors for Voyager 1 LECP Far Encounter and Cruise Channels
Passbands and Geometrical Factors for Voyager 2 LECP Far Encounter and Cruise Channels

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Last modified 8/8/05, Tizby Hunt-Ward
tizby@ftecs.com