| Data Set Abstract |
THIS DATA SET CONTAINS THE BEST ESTIMATES OF THE TOTAL ION
DENSITY FROM VOYAGER 2 AT JUPITER IN THE PLS VOLTAGE RANGE
(10-5950 EV/Q). IT IS CALCULATED USING THE METHOD OF MCNUTT ET
AL. (1981) WHICH TO FIRST ORDER CONSISTS OF TAKING THE TOTAL
MEASURED CURRENT AND DIVIDING BY THE COLLECTOR AREA AND PLASMA
BULK VELOCITY. THIS METHOD IS ONLY ACCURATE FOR HIGH MACH NUMBER
FLOWS DIRECTLY INTO THE DETECTOR, AND MAY RESULT IN
UNDERESTIMATES OF THE TOTAL DENSITY OF A FACTOR OF 2 IN THE OUTER
MAGNETOSPHERE. THUS ABSOLUTE DENSITIES SHOULD BE TREATED WITH
CAUTION, BUT DENSITY VARIATIONS IN THE DATA SET CAN BE TRUSTED.
THE LOW RESOLUTION MODE DENSITY IS USED AT ALL TIMES EXCEPT DAY
190 2100-2200 WHEN THE LARGER OF THE HIGH AND LOW RESOLUTION MODE
DENSITIES IN A 96 SEC PERIOD IS USED. COROTATION IS ASSUMED
INSIDE L=17.5, AND A CONSTANT VELOCITY COMPONENT OF 200 KM/S INTO
THE D CUP IS USED OUTSIDE OF THIS. THESE ARE THE DENSITIES GIVEN
IN THE MCNUTT ET AL. (1981) PAPER CORRECTED BY A FACTOR OF 1.209
(.9617) FOR DENSITIES OBTAINED FROM THE SIDE (MAIN) SENSOR. THIS
CORRECTION IS DUE TO A BETTER CALCULATION OF THE EFFECTIVE AREA
OF THE SENSORS. DATA FORMAT: COLUMNS 1-6 ARE TIME (YEAR, DAY,
HOUR, MIN, SEC, MSEC) COLUMN 7 IS THE MOMENT DENSITY IN CM-3.
EACH ROW HAS FORMAT (6I4, E12.3). VALUES OF 1.E32 INDICATE THAT
THE PARAMETER COULD NOT BE OBTAINED FROM THE DATA USING THE
STANDARD ANALYSIS TECHNIQUE. ADDITIONAL INFORMATION ABOUT THIS
DATASET AND THE INSTRUMENT WHICH PRODUCED IT CAN BE FOUND
ELSEWHERE IN THIS CATALOG. AN OVERVIEW OF THE DATA IN THIS DATA
SET CAN BE FOUND IN MCNUTT ET AL. (1981) AND A COMPLETE
INSTRUMENT DESCRIPTION CAN BE FOUND IN BRIDGE (1977). |
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