Ulysses URAP PFR Peak E-Field at 10 Minutes Data Description Ulysses URAP - Unified Radio and Plasma Wave Experiment Bundle PDS3 DATA_SET_ID = ULY-J-URAP-4-SUMM-PFR-PEAK-E-10MIN-V1.0 ORIGINAL DATA_SET_NAME = ULY JUP URAP PLASMA FREQ REC PEAK E-FIELD 10 MIN START_TIME = 1991-11-26T00:00:00.000 STOP_TIME = 1992-06-07T23:50:00.000 PDS3 DATA_SET_RELEASE_DATE = 1998-05-01 PRODUCER_FULL_NAME = ROGER HESS Collection Overview =================== A UDS data files Eight files are provided that conform to the UDS conventions regarding the naming of files and the format of the data. The eight files are divided into 4 pairs of files with each pair consisting of a file containing data averaged over a 10 minute period and a file containing the maximum data value during the same 10 minute period. The 4 pairs of file contain data for the RAR, the PFR, WFA - magnetic field, and WFA - magnetic field. A.2 Plasma Frequency Receiver To reduce the size of the UDS files only 16 frequency channels are given which represent the combination of every 2 adjacent channels. The UDS average data files are computed by averaging the Ex-average data values all data that falls in each 10 minute period for each of the 32 channels. Then adjacent channels are averaged together to yield the 16 channels present in the UDS files. The UDS peak data files are computed by finding the the peak value of the Ex-peak data that falls in the 10 minute period. Then the peak of adjacent channels is found to yield the 16 channels present in the UDS files. Because of the limited usefulness of fixed-frequency data when averaged, it has been ignored when creating the UDS files so these 1 hour intervals of fixed-frequency will be replaced by the 'bad data' value of -9.99e+10. Data ==== File names (following PDS convention): Tyyddd.TAB -> Average data Tyyddd.TAB -> Peak data yy: Last two digits of year. ddd: Day of year (001..366). The files are Ascii and contain one line for each time period (even if there are no valid data for a time period) so they contain 144 lines each. The format of the data is indicated by the following Fortran read statement which can be used to read the files: DIMENSION F(16) READ(1,100) TIME,MODE,IBPS,F 100 FORMAT(A24,1X,A2,A1,16(1X,1PE9.2)) These variables are defined as follows: TIME: spacecraft event time in the format yyyy-mm-ddThh:mm:ss.sssZ MODE: PFR scan mode: 1: Fast mode. 2: Slow mode. 3: Fixed frequency mode. This value should not occur as fixed frequency data is removed from the UDS data. 4: The mode switched from fast to slow or slow to fast during the averaging interval. 5: Unknown mode. This value occurs if there was no valid data during the averaging interval. This could be due to a data gap or bad data. Data acquired while the PFR is in fixed tune mode is ignored so this value for the MODE will also occur if the PFR was in fixed tune mode during the entire averaging interval. BPS: Telemetry bit rate: 1: 128 bps. 2: 256 bps. 3: 512 bps. 4: 1024 bps. 5: Bit rate changed during averaging period. 6: Bit rate unknown. F: Contains the PFR data (either average or peak values, depending on the file) of the 16 frequency channels. The frequencies given below are the average of the two adjacent frequencies that are combined. F(1): 0.61 kHz F(2): 0.80 kHz F(3): 1.04 kHz F(4): 1.35 kHz F(5): 1.77 kHz F(6): 2.30 kHz F(7): 3.01 kHz F(8): 3.92 kHz F(9): 5.11 kHz F(10): 6.67 kHz F(11): 8.70 kHz F(12): 11.34 kHz F(13): 14.79 kHz F(14): 19.30 kHz F(15): 25.16 kHz F(16): 32.82 kHz NOTES: These data are electric field intensities detected by the Plasma Frequency Receiver (PFR) on the X antenna of the URAP instrument. Units: microvolt/Hz**.5 measured at the receiver input terminals. To convert to electric field strength the given data must be divided by the effective length of the antenna. This is complicated by the fact that the effective length depends on the antenna impedance which is affected by the plasma conditions local to the Ulysses spacecraft. The impedance will also depend on the frequency. In general, the PFR frequencies can be affected by the plasma so a single number cannot be used for the effective antenna length. Time resolution: 10 minutes Fill value for bad or missing data is -9.99e+10 References: =========== Barrow, C.H., and A. Lecacheux, Radio Emission from Jupiter Observed by Ulysses Before and After Encounter, Astron. Astrophys, 271, 335-343, 1993. Canu, P., N. Cornilleau-Werhlin, C. de Villedary, P.J. Kellogg, C.C. Harvey, and R.J. 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Aubier, M.L. Kaiser, M.D. Desch, W.M. Farrell, R.J. MacDowall, and R.G. Stone, In Ecliptic Observations of Jovian Radio Emissions by Ulysses: Comparison with Voyager Results, Geophys. Res. Let., 19, 1307-1310, 1992. (https://doi.org/10.1029/92GL01037) Lin, N., P.J. Kellogg, R.J. MacDowall, Y. Mei, N. Cornilleau- Wehrlin, P. Canu, C. de Villedary, L. Rezeau, A. Balogh, and R.J. Forsyth, ULF Waves in the Io Torus: Ulysses Observations, J. Geophys Res., 98, 21151-21162, 1993. (https://doi.org/10.1029/93JA02593) Lin, N., P.J. Kellogg, J.P. Thiessen, D. Lengyel-Frey, B.T. Tsurutani, and J.L. Phillips, Whistler Mode Waves in the Jovian Magnetosheath, J. Geophys. Res., 99, 23527, 1994. (https://doi.org/10.1029/94JA01998) MacDowall, R.J., M.L. Kaiser, M.D. Desch, W.M. Farrell, R.A. Hess, and R.G. Stone, Quasiperiodic Jovian Radio Bursts: Observations from the Ulysses Radio and Plasma Wave Experiment, Plan. Space Sci., 41, 1059-1072, 1993. 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