Ulysses URAP WFA 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-WFA-PEAK-E-10MIN-V1.0
ORIGINAL DATA_SET_NAME = ULY JUP URAP WAVEFORM ANALYZER 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.3 Waveform Analyzer Electric Field
Four UDS files are produced per day for the WFA data. Two of
the files contain average and peak data for the Ex signals and
two files contain average and peak data for magnetic field
data. The high band channels (upper 12 frequencies) always
contain By. The low band channels (lower 10 frequencies)
contain either By or Bz depending on the mode of the
instrument. A flag specifying the mode is provided for each
time interval.
The lowest two frequencies of the WFA are derived in a
different manner so they have been left out of the UDS data.
This leaves 10 frequencies from the low band and 12
frequencies from the high band. The frequencies are given
below.
The peak data provided by the WFA high band frequently do not
exceed the threshold background so the average values have
been used in all cases.
The files of 10 minute averaged data were computed by, for all
data falling within the 10 minute periods, finding the average
values for each frequency.
Similiarly, the files of peak data were computed by, for all
data falling within the 10 minute periods, finding the maximum
value for each frequency.
The WFA data is affected by interference from other
instruments. In particular, interference from the PFR occurs
and is dependent on the PFR scan mode. For this reason a
flag indicating the PFR mode is provided in the WFA files.
WFA electric field data:
The names of the files are (following the PDS convention):
Tyyddd.TAB -❯ Average data
Tyyddd.TAB -❯ Peak data
yy: Last two digits of year.
ddd: Day of year (1..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(22)
READ(1,100) TIME,IPFRMODE,IBPS,F
100 FORMAT(A24,1X,A2,A1,A1,22(1X,1PE9.2))
The variables are defined as follows:
TIME: Spacecraft event time in the format
yyyy-mm-ddThh:mm:ss.sssZ.
PFRMODE: Indicates the scan mode of the PFR instrument.
1: Fast scan mode.
2: Slow scan mode.
3: Fixed-frequency mode.
4: The mode switched during the averaging interval.
5: The mode could not be determined.
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 data for Ex (peak values) of the 22 frequency
channels. The frequencies are:
F(1): 0.22 Hz
F(2): 0.33 Hz
F(3): 0.44 Hz
F(4): 0.66 Hz
F(5): 0.88 Hz
F(6): 1.33 Hz
F(7): 1.77 Hz
F(8): 2.66 Hz
F(9): 3.55 Hz
F(10): 5.33 Hz
F(11): 9.00 Hz
F(12): 14.00 Hz
F(13): 19.00 Hz
F(14): 28.00 Hz
F(15): 37.00 Hz
F(16): 56.00 Hz
F(17): 75.00 Hz
F(18): 112.00 Hz
F(19): 149.00 Hz
F(20): 224.00 Hz
F(21): 299.00 Hz
F(22): 448.00 Hz
These data are electric field intensities detected by the
Waveform Analyzer (WFA) 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
WFA 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:
========
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