Data Set Information
DATA_SET_NAME GALILEO PROBE EPI RAW DATA SET
DATA_SET_ID GP-J-EPI-3-ENTRY-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : The Galileo Probe Energetic Particles Investigation (EPI) Raw Data Set contains two tables of the EPI raw data values sorted by sampling time. The counter table contains the raw counter values as measured and the countrate table contains the countrates as derived from counter values, but without any correction. The tables are split into omnidirectional and sectorized data. The distance to Jupiter is given in Jupiter radii, Rj, and was derived from the Probe trajectory data. The time of probe entry is taken to be 1995-12-07T22:04:44Z when the probe reached an altitude of 450 km above the 1 bar pressure level. Parameters : The counter values are numbers without unit, while the countrates are given in counts per second. The sampling time for the omnidirectional channels E12, E22, E32, P12, P31, P32 was 17.145 s, for the omnidirectional HE2 channel it was 46.72 s, for the omnidirectional channel HVY in sample 1 - 4 it was 128 s and for the omnidirectional channels HVY1-HVY4 in sample 5-15 it was 64 s. For the sectorized channels E11S, E21S, E31S, P11S, P21S, P22S the sampling time was 2.143 s and for the sectorized HE1S channel it was 11.43 s. 1 Rj : 71372 km. This value for Rj was selected to be consistent with the value used by the Pioneer 10 and 11 investigations. The Pioneers were the only other spacecraft to fly to low jovian altitudes. Users should be cautioned when comparing data sets organized by distance when the units provided are jovian radii. Many different values have been selected by the Pioneer, Voyager, Ulysses, and Galileo teams. In particular, the value used here is inconsistent with the value widely adopted by orbiter scientists who use the value 71492 km. Data : The EPI RAW DATA SET comprises five tables: (1) Counter Table - Omnidirectional (2) Counter Table - Sector (3) Countrate Table - Omnidirectional (4) Countrate Table - Sector (5) Housekeeping Table (1-2) Counter Tables These tables contain the raw counter values as measured. The data are sorted by their distance to Jupiter given in Jupiter radii, Rj. (3-4) Countrate Tables These tables contain the raw countrates derived from the counter values. The data are sorted by their distance to Jupiter given in Jupiter radii, Rj. (5) Housekeeping Table This table contains the detector leakage currents and the temperature of the EPI sensor. The data are sorted by their distance to Jupiter given in Jupiter radii, Rj. Ancillary Data : Trajectory and timing information were obtained from the Galileo Project. Coordinate System : The data are presented according to the radial distance of the probe to Jupiter as given by the project office.
DATA_SET_RELEASE_DATE 1996-12-08T00:00:00.000Z
START_TIME 1995-12-07T07:06:48.000Z
STOP_TIME 1995-12-07T09:54:18.000Z
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 ENERGETIC PARTICLES INVESTIGATION
INSTRUMENT_ID EPI
INSTRUMENT_TYPE ENERGETIC PARTICLE DETECTOR
NODE_NAME Planetary Atmospheres
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE Confidence Level Overview : The EPI data are transmitted completely without gaps from the orbiter to Earth and the sample overwriting for the last samples was done correctly. Data Coverage and Quality : For the samples 5 and 6 there are no housekeeping data. The housekeeping data in these samples belong to the samples 16 and 17. This is a consequence of the sample overwriting procedure, which was introduced to cover in any case the region of particle population down to the innermost edge of the magnetosphere independently of an early or late arrival of the probe. Limitations : These data are raw data. For a correct interpretation of the data the knowledge of the response functions of the instrument as well as a dead-time and stray-coincidence correction are necessary.
CITATION_DESCRIPTION Citation TBD
ABSTRACT_TEXT The Galileo Probe Energetic Particles Investigation (EPI) Raw Data Set contains two tables of the EPI raw data values sorted by sampling time. The counter table contains the raw counter values as measured and the countrate table contains the countrates as derived from counter values, but without any correction. The tables are split into omnidirectional and sectorized data. The distance to Jupiter is given in Jupiter radii, Rj, and was derived from the Probe trajectory data. The time of probe entry is taken to be 1995-12-07T22:04:44Z when the probe reached an altitude of 450 km above the 1 bar pressure level.
PRODUCER_FULL_NAME HARALD FISCHER
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