![]() |
Fundamental TechnologiesVoyager 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.
Return to Fundamental Technologies Home Page.
Last modified 7/7/05, Tizby Hunt-Ward
tizby@ftecs.com