Voyager LECP Data Analysis Handbook
Data File Descriptions
S1P-014-82
February 2, 1982
TO: Voyager LECP Team Members
FROM: J. F. Carbary
SUBJECT: GSFC MAG Data and Merged NAV-MAG Data
The GSFC magnetometer team has recently made available to us the Saturn encounter MAG data. The data have a time resolution of 48S and cover the time intervals:
| VGR 1 | 1980-317-00:00 |
| 1980-321-22:50 | |
| VGR 2 | 1981-237-00:00 |
| 1981-241-23:50 |
The MAG data are given in the spacecraft payload (PLD) system - not the usual heliographic (RTN) system. The experimenters must take care to make the necessary transformations. The PLD data are in the same positions on a MAG tape as the usual RTN data were.
In addition, tapes have been created which contain merged navigation (NAV) and MAG data at a 48S time resolution. These NAVMAG tapes are FB, 1600 BPI and have the following record format:
| INTEGER WORD NO. |
TYPE | DATA | COMMENT |
|---|---|---|---|
| 1 | I*2 | YY | 2 digit year |
| 2 | I*2 | DDD | Day of year (Jan 1 = 1) |
| 3 | I*2 | HH | Hour of day |
| 4 | I*2 | MM | Minute of hour |
| 5 | I*2 | SS | Second of minute |
| 6 | I*2 | II | Spare |
| 7-10 | R*8 | TSEC | Seconds since 1977.000.00 |
| 11-16 | R*4 | R(3) | Spacecraft X,Y,Z in STN frame* in RS** |
| 17-22 | R*4 | B(3) | Magnetic field Bx, By, Bz in STN frame* in g |
| 23-40 | R*4 | TM(3,3) | Transform matrix from LECP frame*** to STN frame* |
| 41-42 | R*4 | LON | Spacecraft SLS longitude**** in degrees |
| 43-44 | R*4 | LAT | Spacecraft latitude in degrees |
| 45-50 | R*4 | SPR | Spares |
Notes
| * | The STN frame is similar to the solar ecliptic frame used at earth. In the STN system, Z points along the spin axis of Saturn, X points sunward in the meridian defined by Z and the planet-sun line, and Y completes the RH system. |
| ** | 1 RS = 60000 km. Users may wish to convert to 1 RS = 60330 km, in which case the conversion factor is 0.99453. |
| *** | The LECP frame is the scan frame of the instrument with Z along the stepper axis, X along the centerline of sector 8, and Y along the centerline of sector Z. |
| **** | Desch and Kaiser, Geophys. Res. Lett., 8, 253, 1981. |
| DEC compatible software is available to read and average these tapes. | |
NAV-MAG File Format
| HEADER | 1 | YY | |
| 2 | DDD | ||
| 3 | HH | ||
| 4 | MM | ||
| 5 | SS | ||
| 6 | spare | ||
| 7 | |||
| 8 | sec | ||
| 9 | |||
| 10 | |||
| 11 | 1 |
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LECP Data Analysis Handbook Table of Contents.
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Updated 8/9/19, Cameron Crane
VOYAGER 1 ELAPSED TIME
*Since official launch
September 5, 1977, 12:56:00:00 UTC
VOYAGER 2 ELAPSED TIME
*Since official launch
August 20, 1977, 14:29:00:00 UTC
QUICK FACTS
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.