| Data Set Abstract |
THIS DATA SET CONTAINS THE BEST ESTIMATES OF THE TOTAL ION
DENSITY AT JUPITER DURING THE VOYAGER 1 ENCOUNTER 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 BEFORE 1979 63 1300,
AFTER THIS THE LARGER OF THE HIGH AND LOW RESOLUTION MODE
DENSITIES IN A 96 SEC PERIOD IS USED SINCE THE L-MODE SPECTRA
OFTEN ARE SATURATED. 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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