Data Set Information
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| DATA_SET_NAME |
ULY JUP SCE RAW ODR V1.0
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| DATA_SET_ID |
ULY-J-SCE-1-ROCC-V1.0
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| NSSDC_DATA_SET_ID |
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| DATA_SET_TERSE_DESCRIPTION |
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| DATA_SET_DESCRIPTION |
Data Set Overview ================= This data set contains raw Radio Occultation (ROCC) Original Data Records data from the Ulysses (ULY) Solar Corona Experiment (SCE) obtained during the ULY Jupiter flyby. The data target the Io Plasma Torus (IPT) and cover the period 1992-02-03 11:20 to 1992-02-09 20:46. The data set includes 41 NASA Deep Space Network (DSN) Original Data Record files (ODR), and documentation. These data are obtained from the Radio Science Support group at JPL. They consist of time-ordered, high-time resolution Doppler data from special radio science receivers (so-called 'open loop' data). The radio downlinks from Ulysses were monitored during the passage of the spacecraft through the IPT shortly after closest approach to Jupiter. The electron content of the Io torus was derived from the dispersive phase shift of the S-band (2.3 GHz) signal with respect to the X-band (8.4 GHz) signal. Corrections were applied for non-Jovian contributions to the change in electron content arising from the interplanetary medium and the terrestrial ionosphere. Ulysses' North-to-South encounter trajectory was well suited for investigating the global structure of the Jovian plasma environment near Io's orbit, especially its latitudinal extent and azimuthal variations. (IPT investigation description adapted from [BIRDETAL1993]. For more information please refer to the complete paper.) Parameters ========== Open loop data records (ODRs) contain 8-bit samples of receiver output. Each block of (nominally) 500 data samples from each of four receivers (or channels) is accompanied a 166 byte header. Each ODR is accompanied by a full PDS label which describes both the content and format of the file at the bit level. Header information includes: Date and time of first data sample Sample rate and channel assignments Receiver local oscillator (POCA) frequency Attenuator settings RMS voltages at several stages in the receiving chain Channel assignments are as follows: Channel 1 X-RCP (X-band right circularly polarized) Channel 2 S-RCP (S-band right circularly polarized) Channel 3 X-LCP (X-band left circularly polarized) Channel 4 S-LCP (S-band left circularly polarized) The ODR is described by a Software Interface Specification (SIS), included as RSC1110A.ASC in the DOCUMENT/RSC1110A directory of this volume. Processing ========== Open loop data (ODRs) are not edited or otherwise processed before being incorporated into this archive. A 32-byte label at the beginning of each ODR tape is not included in the data file; it gives the software version of the data taking equipment and is saved instead in the PDS label that accompanies the data file. Data ==== ODRs were generated at stations of the NASA Deep Space Network (DSN) and were distributed on 6250 bpi tape. Those tapes have been copied to disk files, defined as PDS TABLE Objects, and archived on this DVD-WO volume. Ancillary data to support analysis are provided in the GEOMETRY, and DOCUMENT directories. A nominal ODR contains 36000 records, each record having 166 bytes of header data and 2000 bytes of 8-bit sample data. On this volume ODR files have names of the form 'ydddhhmm.ODR' where 'y' gives the least significant digit of the year, 'ddd' is the 3-digit day-of-year, 'hh' is the 2-digit hour, and 'mm' is the 2-digit minute on which data acquisition for the file began. Each ODR data file is accompanied by a full PDS detached label with name 'ydddhhmm.LBL' which completely describes the contents of the ODR file. The format and contents are also described in RSC1110A.ASC in the DOCUMENT/RSC1110A directory of this archival volume. Ancillary Data ============== For each ODR, there is a set of ancillary files needed for analysis. These are stored in the DOCUMENT and GEOMETRY directories, as appropriate. Observing Geometry ------------------ A NAIF (PDS Navigation and Ancillary Information) 'transfer' format SPK files is provided for the period 1992-01-05 to 1995-10-31. This file contains the positions of Ulysses, Jupiter, Earth, the Sun, and Jupiter's four Galilean satellites (Io, Europa, Ganymede, and Callisto) in data modules that can be used readily with NAIF Toolkit software. This 'transfer' format SPK file (ULY92106.XSP) is located in the GEOMETRY directory. The XSP file is accompanied by a detached PDS label (ULY92106.LBL) which describes some of the SPK file's characteristics. Before using 'transfer' NAIF files, the user should convert ASCII carriage-return line-feed delimiters on each record to the default delimiter for text files on the local system, then use the NAIF utility SPACIT to convert the archival file to local binary. An overview of the SPICE data system can be found in SPICE.TXT located in the DOCUMENT directory of this volume. For additional information on acquiring, installing, and using SPICE data or software please contact the PDS NAIF node: Address: Jet Propulsion Laboratory Mail Stop 301-125L Pasadena, California 91109-8099 Phone: (818) 354-3869 E-mail: Charles.Acton@jpl.nasa.gov or pds_operator@naif.jpl.nasa.gov Documentation ------------- A copy of a document [RSC-11-10A] describing the format of the Ulysses ODR data contained on this volume is provided in the DOCUMENT/RSC1110A directory. Coordinate System ================= SPK ephemeris files and quaternion files were produced for the J2000 inertial reference frame. SPICE reader routines may be used to convert these to other coordinate systems. Other data types are not dependent on definition of a coordinate system. Software ======== Software for parsing, reducing, and analyzing these data has been developed at Stanford University, the Jet Propulsion Laboratory, and other institutions. Because parsing must be done at the bit level, adaptation of the software to other platforms is not always easy. No software has been prepared for general distribution, and none is included with this archive. Users should refer to the PDS labels and Software Interface Specifications (/DOCUMENT/RSC1110A/RSC1110A.ASC) for detailed information on file formats before writing their own software. Media/Format ============ This archival data set is written on DVD-R media using a Pioneer DVR-A03 recorder (DVD-R for General, 650 nm wavelength). The DVD-R volume conforms to ISO 9660 standards.
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| DATA_SET_RELEASE_DATE |
2001-08-01T00:00:00.000Z
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| START_TIME |
1992-02-03T11:20:09.000Z
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| STOP_TIME |
1992-02-09T08:46:15.000Z
|
| MISSION_NAME |
ULYSSES
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| MISSION_START_DATE |
1990-10-06T12:00:00.000Z
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| MISSION_STOP_DATE |
N/A (ongoing)
|
| TARGET_NAME |
JUPITER
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| TARGET_TYPE |
PLANET
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| INSTRUMENT_HOST_ID |
ULY
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| INSTRUMENT_NAME |
SOLAR CORONA EXPERIMENT
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| INSTRUMENT_ID |
SCE
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| INSTRUMENT_TYPE |
RADIO SCIENCE
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| NODE_NAME |
planetary plasma interactions
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| ARCHIVE_STATUS |
ARCHIVED
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| CONFIDENCE_LEVEL_NOTE |
Confidence Level Overview ========================= The ODR data files have been tested by being read, a histogram computed of sample values, time-averaged power spectra derived from the samples, and one-second averages generated of sample power. Data quality concerns discovered in this process are listed the 'Data Coverage and Quality' section below. Review ====== Prior to creation of the final version of the archival data set, the archive was distributed to both PDS and non-PDS personnel, including the PDS Radio Science advisor, for preliminary review. Data Coverage and Quality ========================= The following table describes data file size and coverage: File bytes start time stop time ------------ -------- ---------------- ---------------- 20341120.ODR 21768300 1992-02-03 11:20 1992-02-03 12:43 20341246.ODR 77976000 1992-02-03 12:46 1992-02-03 17:46 20341746.ODR 50285856 1992-02-03 17:46 1992-02-03 21:00 20351118.ODR 30064080 1992-02-04 11:18 1992-02-04 13:14 20351314.ODR 77976000 1992-02-04 13:14 1992-02-04 18:14 20351814.ODR 40161972 1992-02-04 18:14 1992-02-04 20:49 20371245.ODR 23475108 1992-02-06 12:45 1992-02-06 14:15 20371415.ODR 77976000 1992-02-06 14:15 1992-02-06 19:15 20371915.ODR 23184864 1992-02-06 19:15 1992-02-06 20:45 20372015.ODR 21755304 1992-02-06 20:15 1992-02-06 21:38 20372139.ODR 77976000 1992-02-06 21:39 1992-02-07 02:39 20380239.ODR 32871216 1992-02-07 02:39 1992-02-07 04:45 20380350.ODR 4555098 1992-02-07 03:50 1992-02-04 04:33 20380407.ODR 17228364 1992-02-07 04:07 1992-02-07 05:14 20380523.ODR 73646166 1992-02-07 05:23 1992-02-07 10:06 20381007.ODR 29362296 1992-02-07 10:07 1992-02-07 11:59 20381119.ODR 26043984 1992-02-07 11:19 1992-02-07 12:59 20381259.ODR 77976000 1992-02-07 12:59 1992-02-07 17:59 20381759.ODR 42791496 1992-02-07 17:59 1992-02-07 20:44 20382011.ODR 23020248 1992-02-07 20:11 1992-02-07 21:39 20382140.ODR 77976000 1992-02-07 21:40 1992-02-08 02:40 20390240.ODR 50931324 1992-02-08 02:40 1992-02-08 05:56 20390350.ODR 29581062 1992-02-08 03:50 1992-02-08 05:44 20390544.ODR 77976000 1992-02-08 05:44 1992-02-08 10:44 20390556.ODR 539334 1992-02-08 05:56 1992-02-08 05:58 20390602.ODR 29379624 1992-02-08 06:02 1992-02-08 07:55 20391044.ODR 13206102 1992-02-08 10:44 1992-02-08 11:35 20391116.ODR 35990256 1992-02-08 11:16 1992-02-08 13:34 20391135.ODR 31183902 1992-02-08 11:35 1992-02-08 13:35 20391335.ODR 77976000 1992-02-08 13:35 1992-02-08 18:35 20391336.ODR 18246384 1992-02-08 13:36 1992-02-08 14:46 20391835.ODR 34950576 1992-02-08 18:35 1992-02-08 20:49 20392020.ODR 21530040 1992-02-08 20:20 1992-02-08 21:43 20392143.ODR 77976000 1992-02-08 21:43 1992-02-09 02:43 20400243.ODR 77976000 1992-02-09 02:43 1992-02-09 07:43 20400416.ODR 15001716 1992-02-09 04:16 1992-02-09 05:14 20400743.ODR 3210012 1992-02-09 07:43 1992-02-09 07:56 20401015.ODR 3853314 1992-02-09 10:15 1992-02-09 10:29 20401130.ODR 25379022 1992-02-09 11:30 1992-02-09 13:07 20401308.ODR 77976000 1992-02-09 13:08 1992-02-09 18:08 20401808.ODR 40915740 1992-02-09 18:08 1992-02-09 20:46 General data quality issues: Ulysses' S-band downlink is elliptically polarized with an axial ratio of approximately 2:1. While, with a 2:1 axial ratio, a difference of 10 dB might be expected between the signal-to-noise ratios (SNR) of the S-band LCP and RCP, the actual difference is around 15 dB. This deviation from the expected difference may be attributed to the fact that the value of 2:1 used for the axial ratio is only approximate. There appears to be a broad noise apron around the carrier (approx. 10 dB and extending to +/-100 Hz) each time a signal is present. Specific data quality issues: The S-band downlink was started 1992-02-05 19:44 (DOY 36). As a result there is no signal on channels 2 and 4 on days 34 and 35. 20341246.ODR - A/D converter saturated on ch. 3 20341746.ODR - A/D converter saturated on ch. 3 20351314.ODR - variation in sample power large on ch. 3 (+/-3 dB about its mean) 20380350.ODR - histogram of sample values on ch. 1 suggest A/D converter not working; unable to compute spectra or sample power vs. time for any channel 20380407.ODR - abnormal histogram of sample values on ch. 1 20390240.ODR - variation in sample power large on ch. 3 (+/-2.5 dB about its mean) 20390350.ODR - abnormal histogram of sample values on ch. 1 20390544.ODR - abnormal histogram of sample values on ch. 1; variation in sample power large on ch. 3 (+/-2 dB about its mean) 20390556.ODR - only 124 sec. of data; no carrier on any channel 20390602.ODR - receiver tuning predicts not good enough: carrier signal drifts out of passband on ch. 1 and 3 20392020.ODR - A/D converter on ch. 3 slightly saturated 20400243.ODR - receiver tuning predicts not good enough: carrier signal drifts out of passband on ch. 1 and 3 20400416.ODR - abnormal histogram of sample values on ch. 1 20400743.ODR - receiver tuning predicts not good enough: carrier signal near edge of passband on ch. 1 and 3 for first half of file, then drifts outside for second half 20401015.ODR - abnormal histogram of sample values on ch. 1 20401808.ODR - no signal during second half of file on ch. 2 and 4 Limitations =========== See 'Data Coverage and Quality' section above.
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| CITATION_DESCRIPTION |
Bird, M.K., ULY JUP SCE RAW ODR V1.0, ULY-J-SCE-1-ROCC-V1.0, NASA Planetary Data System, 2001
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| ABSTRACT_TEXT |
This data set contains raw Radio Occultation (ROCC) Original Data Records data from the Ulysses (ULY) Solar Corona Experiment (SCE) obtained during the ULY Jupiter flyby. The data target the Io Plasma Torus (IPT) and cover the period 1992-02-03 11:20 to 1992-02-09 20:46.
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| PRODUCER_FULL_NAME |
MICHAEL K. BIRD
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| SEARCH/ACCESS DATA |
Planetary Plasma Interactions Website
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