Data Set Information
DATA_SET_NAME VG2 URA PLS DERIVED SUMM ELECTRON BROWSE 48SEC V1.0
DATA_SET_ID VG2-U-PLS-5-SUMM-ELEBR-48SEC-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION This data set contains the thermal electron density and temperature in the PLS energy range (10-5950 eV) from Voyager 2 at Uranus derived by fitting the low energy electron component with a Maxwellian distribution, and the moment density and temperature of the hot electrons calculated after the signal from the thermal component is subtracted from the electron spectra. The moment density and temperature obtained by integrating over the entire measured distribution function are also given. This is a subset of the data set VG2-U-PLS-5-RDR-ELEFIT-48SEC which should be obtained before this data is used, since it contains information on the type of fit performed and LECP contamination of the data. Spacecraft charging may result in underestimation of thermal electron density in some regions. The first six columns are the time tag (year, day, hour, min, sec, msec), columns 7 and 8 are the total moment density and temperature, columns 9 and 10 are the fit density and temperature of the thermal electron component, and 11 and 12 are the moment density and temperature of the suprathermal electrons. Each row has the format (6I4,6E12.4). 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 Sittler et al. (1987) and a complete instrument description can be found in bridge (1977). OBJECT = DSPARMINFO SAMPLING_PARAMETER_NAME = TIME SAMPLING_PARAMETER_RESOLUTION = 48.000000 MINIMUM_SAMPLING_PARAMETER = N/A MAXIMUM_SAMPLING_PARAMETER = N/A SAMPLING_PARAMETER_INTERVAL = 48.000000 MINIMUM_AVAILABLE_SAMPLING_INT= 48.000000 SAMPLING_PARAMETER_UNIT = SECOND DATA_SET_PARAMETER_NAME = ELECTRON DENSITY NOISE_LEVEL = N/A DATA_SET_PARAMETER_UNIT = CM-3 SAMPLING_PARAMETER_NAME = TIME SAMPLING_PARAMETER_RESOLUTION = 48.000000 MINIMUM_SAMPLING_PARAMETER = N/A MAXIMUM_SAMPLING_PARAMETER = N/A SAMPLING_PARAMETER_INTERVAL = 48.000000 MINIMUM_AVAILABLE_SAMPLING_INT= 48.000000 SAMPLING_PARAMETER_UNIT = SECOND DATA_SET_PARAMETER_NAME = ELECTRON TEMPERATURE NOISE_LEVEL = N/A DATA_SET_PARAMETER_UNIT = CM-3
DATA_SET_RELEASE_DATE 1993-02-01T00:00:00.000Z
START_TIME 1986-01-24T07:06:31.204Z
STOP_TIME 1986-01-24T11:59:19.137Z
MISSION_NAME VOYAGER
MISSION_START_DATE 1972-07-01T12:00:00.000Z
MISSION_STOP_DATE N/A (ongoing)
TARGET_NAME URANUS
TARGET_TYPE PLANET
INSTRUMENT_HOST_ID VG2
INSTRUMENT_NAME PLASMA SCIENCE EXPERIMENT
INSTRUMENT_ID PLS
INSTRUMENT_TYPE PLASMA INSTRUMENT
NODE_NAME planetary plasma interactions
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE This data set provides an estimate of the electron parameters in the PLS energy range (10-5950 eV). The thermal electron parameters may be underestimated in some regions due to negative spacecraft charging which is not corrected for. Electron parameters may also be unreliable between 1736 and 1854 scet on Jan 24 where electron temperatures are below the instrument energy threshold. Between 1920 and 2150 scet on Jan 24 the spacecraft had a large (several hundred volt) negative potential, so electron parameters in this region should also be treated with caution. The instrument threshold for detecting electrons is a density of about 0.001 cm-3. At times when the density is near this value all derived parameters are suspect. From 1621 to 1649 on Jan. 24 sunlight created an artificial signal so this data should be discarded. The LECP stepper motor is also creates a spurious signal in the PLS detector.
CITATION_DESCRIPTION Richardson, J.D., VG2-U-PLS-5-SUMM-ELEBR-48SEC-V1.0, VG2 URA PLS DERIVED SUMM ELECTRON BROWSE 48SEC V1.0, NASA Planetary Data System, 1993.
ABSTRACT_TEXT This data set contains the thermal electron density and temperature in the PLS energy range (10-5950 eV) from Voyager 2 at Uranus derived by fitting the low energy electron component with a Maxwellian distribution, and the moment density and temperature of the hot electrons calculated after the signal from the thermal component is subtracted from the electron spectra. The moment density and temperature obtained by integrating over the entire measured distribution function are also given.
PRODUCER_FULL_NAME JOHN D. RICHARDSON
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