Fundamental Technologies

Voyager LECP Pages

Record and File Structure: Near Encounter
(applies to Voyager 1 Jupiter, 1979 day 64, and Voyager 2 Saturn, 1981 day 238)

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 “NG” identifying this file as LECP Near Encounter Mode
11 and 12 “01” through “09” identifying which Near Encounter 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

File #

Column #
1 2 3 4 5 6 7 8
1 PL01 PL02 PL03 EB04 EBP04      
2 EB01 EBP01 EB02 EBP02 EB03 EBP03 EG06  
3 PD09 DP09 PD10 DP10 PD11 DP11 AD03 DA03
4 EG07 EG08 EG09 EB05 EBP05      
5 PSA3 PSB3 PAB12 PAB13        
6 PL04 ZD01 DZ01 ESA0 ESB0      
7 PSA1 PSB1 PSA2 PSB2        
8 AL01 AL02 PL08 AD04 DA04      
9 EAB10 PL05 PL06 PL07        

Note: Passbands and Geometrical Factors corresponding to each of the labels are given in Tables 4 and 5 for Voyager 1 and 2 respectively.

Table 4. Near Encounter Channel Definitions for Voyager 1 LECP
Table 5. Near Encounter Channel Definitions for Voyager 2 LECP

Return to Voyager LECP Data Analysis Handbook Table of Contents.
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Last modified 7/7/05, Tizby Hunt-Ward
tizby@ftecs.com