Data Set Information
DATA_SET_NAME GALILEO PROBE ASI RAW DATA SET
DATA_SET_ID GP-J-ASI-3-ENTRY-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : From [SEIFFETAL1996]: The Galileo Probe Atmospheric Structure Instrument (ASI) measured state properties of Jupiter's atmosphere from nanobar pressure levels to a final pressure of ~24 bars. The depth reached in the probe's parachute descent, calculated from measured temperatures and pressures assuming hydrostatic equilibrium, was ~160 km or 0.22% of the radius of Jupiter. Velocities during descent decreased from ~400 m/s at parachute deployment to 156 m/s in the first 100 s, to ~48 m/s at the 3-bar level, and to ~30 m/s at loss of signal. Temperatures measured in parachute descent had an accuracy of ~1 K and a dispersion on the order of the digital resolution (0.12 K). Comparison with the Orton model indicates that the atmosphere is close to a dry adiabat over this pressure range. Water condensation, expected above the 5-bar level if the oxygen mole fraction is solar (0.0017) and above the 4-bar level for the low water abundance detected by the neutral mass spectrometer (~0.2 of the solar abundance value), has major effects on the temperature variation. Temperatures following the dry adiabat at these levels confirm the low water abundance and are consistent with the absence of a detectable water cloud. Deviations from the adiabat between 1 and 3 bars, which were initially interpreted as a stable layer in the tenuous cloud above 1.6 bars and an unstable layer below the cloud, now are believed to reflect departures from preflight pressure sensor calibrations resulting from unanticipated variations in the probe's internal temperature.
DATA_SET_RELEASE_DATE 1996-12-08T00:00:00.000Z
START_TIME 1995-12-07T07:04:00.000Z
STOP_TIME 1995-12-07T10:04:00.000Z
MISSION_NAME GALILEO
MISSION_START_DATE 1977-10-01T12:00:00.000Z
MISSION_STOP_DATE 2003-09-21T12:00:00.000Z
TARGET_NAME JUPITER
TARGET_TYPE PLANET
INSTRUMENT_HOST_ID GP
INSTRUMENT_NAME ATMOSPHERIC STRUCTURE INSTRUMENT
INSTRUMENT_ID ASI
INSTRUMENT_TYPE METEOROLOGY
NODE_NAME Planetary Atmospheres
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE Confidence Level Overview : Details can be found in [SEIFFETAL1996].
CITATION_DESCRIPTION Citation TBD
ABSTRACT_TEXT This data set is most accurately described in [SEIFFETAL1996]:
PRODUCER_FULL_NAME TONY KNIGHT
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