CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = DATA_SET DATA_SET_ID = "ULY-J-SCE-3-RDR-DOPPLER-HIRES-V1.0" OBJECT = DATA_SET_INFORMATION DATA_SET_NAME = "ULY JUP SCE DOPPLER HI-RES DATA" DATA_SET_COLLECTION_MEMBER_FLG = N START_TIME = 1992-02-08T11:00:00.000Z STOP_TIME = 1992-02-08T20:45:02.000Z DATA_SET_RELEASE_DATE = 1998-05-01 PRODUCER_FULL_NAME = "MICHAEL K. BIRD" DETAILED_CATALOG_FLAG = N DATA_OBJECT_TYPE = "TIME SERIES" DATA_SET_DESC = " Data Set Overview ================= The Ulysses spacecraft was occulted by the Io Plasma Torus (IPT) during its Jupiter encounter on 8 February 1992. The Ulysses dual-frequency radio subsystem used by the Ulysses Solar Corona Experiment (SCE) was utilized to measure the electron content (column density) of the IPT [BIRDETAL1992B]. In the nominal mode for radio-sounding observations [BIRDETAL1992A], both downlinks (S-band: f_s = 2.3 GHz; X-band: f_x = 8.4 GHz) are phase coherent with the uplink (S-band: f_u = 2.1 GHz). The dual-frequency radio-sounding technique exploits the dispersive nature of ionized media on the propagation of the two downlinks. The tiny Doppler shift due to plasma moving in and out of the ray path is greater at S-band than at the higher frequency X-band. The SCE data are obtained from the Radio Science Support group at JPL. There are basically two types of data: Ranging and Doppler (Frequency), recorded as a function of UT Ground Received Time. The raw data are delivered in special binary files called ATDFs (Archival Tracking Data Files), containing Ranging and Doppler data from the standard DSN tracking receivers. There are high-time resolution Doppler data from special radio science receivers (so-called 'open loop' data) as well. These are in files called ODRs (Original Data Records). ATDFs are files of radiometric data produced by the Network Operations Control Center (NOCC) Navigation Subsystem (NAV). They are derived from Intermediate Data Records by NAV and contain all radiometric measurements received from the DSN station including signal levels (`AGC' = automatic gain control in dBm), antenna pointing angles, frequency (often referred to simply as 'Doppler'), range, and residuals. Doppler data are often used to infer spacecraft radial motion relative to the tracking antenna. Data values in ATDFs are reported at rates no higher than 10 per second. For the Ulysses Jupiter encounter the received frequencies at S-Band and X-band were recorded at a sample time of one per second. Each ATDF data record contains 117 parameters, stored in records of 288 bytes. The ATDF is described in section TRK-2-25 of the JPL Document 820-13 [DSN820-13]. The ATDFs have been analyzed for the Jupiter encounter and a detailed report has been published [BIRDETAL1993]. Data files have been generated which contain the Ranging and Doppler data at various stages of processing. Stage #1 is generally just stripping the Ranging/Doppler data from the ATDFs. Stage #2 is to 'clean' the data files by weeding out obviously bad data. Stage #3 is to produce a 'final data set', a table of the measured data plus physically relevant quantities as function of time. For the Doppler data, getting to stage #3 involves manipulating the frequency data to extract the changes in electron column density. An additional complication is the compensation for the Earth's ionosphere to separate its contribution from that of the Io Plasma Torus. This requires obtaining ionospheric calibration data from the DSN for the days of the Jupiter encounter. Details of the calibration procedure can be found in section TRK-2-23 of JPL document 820-13 [DSN820-13]. Because the processing to stage #3 can be done in a variety of ways, it is best to leave the frequency measurements in their stage #2 form for the archiving process. In contrast to the modest volume of ranging data, the much higher sample rate increases the Doppler data volume to Megabyte proportions. Data ==== The following tables give an idea about the size and coverage of the data set: Ulysses SCE Doppler data at Jupiter (complete set): Stage# start stop ascii size doy:hh:mm doy:hh:mm (MB) 1 36:15:45 41:15:44 72 2 36:20:30 40:19:18 21 The size of the data set has been reduced by providing only the Doppler data from the tracking passes at DSS 43/42 on Jupiter encounter day, when the spacecraft was occulted by the Io Plasma Torus. In this case the table of data becomes: Ulysses SCE Doppler data at Jupiter (encounter day only): Stage# start stop ascii size doy:hh:mm doy:hh:mm (MB) 1 39:03:15 40:00:00 16 2 39:11:00 39:20:45 2 Here are a few lines of the ASCII file at stage #2: ULS IPT OCCULTATION: 8 FEB 1992 (DOY 39) DSS 42/43: S/X-BAND COHERENT 10.25000 21.41667 0.7528 -2.5346 5.6032 3.4620 -1.4765 -2.5889 time (hrs) S-band phase S-3/11X AGC 10.99999992 1566823818.441 -0.075 -150.9 11.00027784 1567875175.345 -0.071 -150.9 11.00055552 1568926527.281 -0.067 -151.3 11.00083344 1569977874.261 -0.043 -151.1 11.00111112 1571029216.279 -0.054 -151.6 11.00138880 1572080553.284 -0.090 -151.3 11.00166672 1573131885.437 0.010 -151.6 where: time (hours) = time in hours on 8 FEB 1992 (DOY 39) S-Band phase = running S-band Doppler count (cycles) S-3/11X = differential frequency (Hz) AGC = S-band received signal level (dBm) and the row of numbers preceding the table gives the necessary parameters for the ionospheric calibration according to TRK-2-23 [DSN820-13] during this pass: tstart tstop c_0 c_1 c_2 c_3 c_4 c_5 10.25000 21.41667 0.7528 -2.5346 5.6032 3.4620 -1.4765 -2.5889 with tstart = start time for the interval of ionospheric calibration tstop = stop time for the interval of ionospheric calibration c_i, i=0,5 = polynomial coefficients for ionospheric calibration" CONFIDENCE_LEVEL_NOTE = " Confidence Level Overview ========================= None provided. For more information regarding the confidence level of this data set please contact: MICHAEL K. BIRD Radioastronomisches Institut Universitat Bonn Auf dem Hugel 71 53121 Bonn GERMANY Phone: 49-228-733651 or 49-228-733675 Fax: 49-228-733672 Internet: mbird@astro.uni-bonn.de" END_OBJECT = DATA_SET_INFORMATION OBJECT = DATA_SET_TARGET TARGET_NAME = JUPITER END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = ULY INSTRUMENT_ID = SCE END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "BIRDETAL1992A" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "BIRDETAL1992B" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "BIRDETAL1993" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "BIRDETAL1994" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "BIRDETAL1996" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "DSN810-5" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "DSN820-13" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "PAETZOLDETAL1992" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "PAETZOLDETAL1995" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "PAETZOLDETAL1996" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "WOO1996" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "WOOETAL1995A" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "WOOETAL1995B" END_OBJECT = DATA_SET_REFERENCE_INFORMATION END_OBJECT = DATA_SET END