Data Set Information
DATA_SET_NAME GALILEO PROBE HELIUM ABUNDANCE DETECTOR DATA V1.0
DATA_SET_ID GP-J-HAD-3-ENTRY-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : From [VONZAHN&HUNTEN1996]: More than 99.5 mole percent of the jovian atmosphere consists of H2 and He. Hence, to a first approximation, this atmosphere can be considered to be a binary gas mixture, for which the mole fraction q(He) can be derived from the ratio of refractive indices q(He) : (n(H2) - n(s)) / (n(H2) - n(He)) where n(He) is the refractive index of He, n(H2) is the refractive index of H, and n(s) is the refractive index of the sample gas (jovian gas). The word 'sample' is used because the refractive index of this jovian gas is measured inside the HAD instrument and at sample gas pressures and temperatures that differ from conditions in the ambient jovian atmosphere. Parameters : From [VONZAHN&HUNTEN1992]: Definitions for abundance measures---------------------------------------------------------------------- 'Mass fraction' N_Hm_H + 2N_H2m_HHydrogen mass fraction X is equivalent to --------------------------- SUM of (N_jm_j) for all j's N_Hem_HeHelium mass fraction Y is equivalent to --------------------------- SUM of (N_jm_j) for all j's Mass fraction of all other elements Z is equivalent to 1 - X - Y with N_i the number density of particles of type i;m_i mass of a particle of type i 'Mole fraction' N_i(mixing ratio) q_i is equivalent to ------------------------ SUM of (N_j) for all j's with SUM of (q_j) for all j's : 1 N_HeIn particular at Jupiter q_He is approximately -------------------- N_H2 + N_He 'Abundance ratio' of N_He helium/hydrogen R_He is equivalent to -------------------- N_H2 ---------------------------------------------------------------------- Processing : Details can be found in [VONZAHN&HUNTEN1996]. Data : The data included here were provided to the PDS by Ulf Von Zahn as a one page FAX. No attempt was made by the instrument team to provide any other data or information such as the interference fringe count.
DATA_SET_RELEASE_DATE 1996-12-08T00:00:00.000Z
START_TIME 1995-12-07T09:05:44.000Z
STOP_TIME 1995-12-07T11:35:44.000Z
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 HELIUM ABUNDANCE DETECTOR
INSTRUMENT_ID HAD
INSTRUMENT_TYPE MASS SPECTROMETER
NODE_NAME Planetary Atmospheres
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE Confidence Level Overview : The error bars are included as reported to the PDS by Von Zahn.
CITATION_DESCRIPTION Citation TBD
ABSTRACT_TEXT This data set is most accurately described in [VONZAHN&HUNTEN1996]:
PRODUCER_FULL_NAME ULF VON ZAHN
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