Data Set Information
|
| DATA_SET_NAME |
VG2 URA PRA RESAMPLED SUMMARY BROWSE
48SEC V1.0
|
| DATA_SET_ID |
VG2-U-PRA-4-SUMM-BROWSE-48SEC-V1.0
|
| NSSDC_DATA_SET_ID |
|
| DATA_SET_TERSE_DESCRIPTION |
This dataset contains edited browse
data derived from an original dataset obtained from the VG2
PRA instrument near Uranus. Data are provided for 70 instrument
channels covering a range from 1.2 kHz to 1326 kHz in uniform
19.2 kHz steps, each 1 kHz wide.
|
| DATA_SET_DESCRIPTION |
This dataset consists of edited browse data derived from an
original dataset obtained from the Voyager 2 Planetary Radio
Astronomy (PRA) instrument in the
vicinity of Uranus. Data are provided for 70 instrument
channels covering the range from 1.2 kHz to 1326 kHz in
uniform 19.2 kHz steps, each 1 kHz wide. Data are included
for the period 1986:019:00:00 through 1986:031:23:59. In order
to produce this dataset from the original raw PRA data,
several steps have been taken:
1. The PRA operates in a variety of modes; data from modes
in which the receiver does not scan rapidly through its
frequency range have been removed;
2. The data have been calibrated as best we know how;
3. The data have been split into Left Hand Circular (LHC)
and Right Hand Circular (RHC) components;
4. The data have been binned into 48-second intervals.
Thus, values at a given channel are separated in time by an
increment of 48 seconds; each 48-second time interval has
associated with it a value for LHC polarization and one for
RHC polarization.
During data gaps, the entire record is absent from the
dataset; that is, missing records have not been zero-filled
or otherwise marked. Bad data within a record is indicated
by the value zero, which cannot otherwise occur.
Each datum is returned as a 16-bit quantity; it represents
the mean power received in the given channel at the
specified time and polarization. The returned quantity is
the value in milliBels (mB) about a reference flux density. The value of
0 mB represents a voltage of 1 microvolt across the front
end of the receiver. To convert a returned quantity to flux,
use the formula:
flux = 7.0x10^(-22)x10^(Mb/1000) W m-2 Hz-1
|
| DATA_SET_RELEASE_DATE |
1993-02-01T00:00:00.000Z
|
| START_TIME |
1986-01-19T12:00:00.000Z
|
| STOP_TIME |
1986-01-31T11:59:59.999Z
|
| MISSION_NAME |
VOYAGER
|
| MISSION_START_DATE |
1972-07-01T12:00:00.000Z
|
| MISSION_STOP_DATE |
N/A (ongoing)
|
| TARGET_NAME |
URANUS
|
| TARGET_TYPE |
PLANET
|
| INSTRUMENT_HOST_ID |
VG2
|
| INSTRUMENT_NAME |
PLANETARY RADIO ASTRONOMY RECEIVER
|
| INSTRUMENT_ID |
PRA
|
| INSTRUMENT_TYPE |
RADIO SPECTROMETER
|
| NODE_NAME |
Planetary Plasma Interactions
|
| ARCHIVE_STATUS |
ARCHIVED
|
| CONFIDENCE_LEVEL_NOTE |
This dataset includes all the available low-rate scanning
mode data for the frequency range below 1326 Khz for the
time interval covered. Known bad data have been set to zero.
Data which appear to exceed the Full Scale Deflection (FSD)
of the instrument (i.e.
the most intense signal which can be measured reliably) have
also been set to a zero (should they occur). Planetary Radio
Astronomy (PRA) suffers
from interference from many other instruments aboard the
spacecraft. No attempt had been made to remove these
interferences in this dataset. The two most obvious examples
of this interference are low-frequency spikes which occur
every twelve minutes throughout the dataset (due to LECP
operation), and a strong, wandering interference (from PPS)
that occurs in the range 200 to 600 kHz at various times
throughout the encounter. An example of the latter is to be
found at 1986-01-24 09:00:00 SCET.
The separation into Left Hand Circular (LHC) and Right Hand
Circular (RHC) polarization components is
performed on the basis of the polarization of the incoming
wave as perceived by the instrument. This takes into account
neither the antenna transfer function nor the spacecraft
orientation with respect to the source. In general, the
mapping of perceived polarization back to emitted
polarization cannot be solved without a knowledge of both
of these factors, as well as a knowledge of the type of
polarization coming from the source region (e.g. is it
linear or circularly polarized?).
Most planetary emissions are circularly polarized. Below is
a table showing the response of the experiment to a low
frequency (100 Khz) LHC wave. The response does not change
much up to about 5 MHz.
SAMPLING_PARAMETER_NAME = TIME
SAMPLING_PARAMETER_RESOLUTION = 0.001
MINIMUM_SAMPLING_PARAMETER = N/A
MAXIMUM_SAMPLING_PARAMETER = N/A
SAMPLING_PARAMETER_INTERVAL = 48.0
MINIMUM_AVAILABLE_SAMPLING_INT = 12.0
SAMPLING_PARAMETER_UNIT = SECOND
DATA_SET_PARAMETER_NAME = RADIO WAVE SPECTRUM
NOISE_LEVEL = 2400
DATA_SET_PARAMETER_UNIT = MILLIBEL
The coordinate system used is: THETA == 0 is along the MAG
boom; PHI == 0 is the bisector of the two PRA antennas. The
third column is the apparent value of the left hand
component as perceived by the receiver. That is, a value of
+1.0 indicates that the incoming LHC wave is correctly
detected as a pure LHC wave. A value of -1.0 will be
detected as being of the correct strength, but incorrect
polarity. A value of, say, 0.6 indicates that the total
energy is split 60% into the apparent LHC component and 40%
into the apparent RHC component. The table below has been
produced using a wire-frame model of the spacecraft
comprising 168 separate elements, and derived using the
method of moments procedure. IT IS ONLY A MODEL, not a
measurement; but appears to be very accurate for the low
band of the PRA instrument.
THETA PHI AFP
0 0 -0.99960
10 0 -0.99727
10 10 -0.99723
10 20 -0.99715
10 30 -0.99706
10 40 -0.99696
10 50 -0.99688
10 60 -0.99681
10 70 -0.99679
10 80 -0.99683
10 90 -0.99692
10 100 -0.99708
10 110 -0.99729
10 120 -0.99754
10 130 -0.99782
10 140 -0.99809
10 150 -0.99832
10 160 -0.99851
10 170 -0.99862
10 180 -0.99866
10 190 -0.99862
10 200 -0.99850
10 210 -0.99833
10 220 -0.99812
10 230 -0.99789
10 240 -0.99767
10 250 -0.99747
10 260 -0.99730
10 270 -0.99719
10 280 -0.99711
10 290 -0.99709
10 300 -0.99710
10 310 -0.99713
10 320 -0.99718
10 330 -0.99723
10 340 -0.99727
10 350 -0.99728
20 0 -0.99613
20 10 -0.99591
20 20 -0.99537
20 30 -0.99455
20 40 -0.99350
20 50 -0.99228
20 60 -0.99099
20 70 -0.98969
20 80 -0.98849
20 90 -0.98744
20 100 -0.98661
20 110 -0.98600
20 120 -0.98562
20 130 -0.98541
20 140 -0.98534
20 150 -0.98534
20 160 -0.98535
20 170 -0.98533
20 180 -0.98528
20 190 -0.98519
20 200 -0.98512
20 210 -0.98510
20 220 -0.98520
20 230 -0.98546
20 240 -0.98590
20 250 -0.98655
20 260 -0.98738
20 270 -0.98837
20 280 -0.98949
20 290 -0.99068
20 300 -0.99189
20 310 -0.99305
20 320 -0.99410
20 330 -0.99499
20 340 -0.99565
20 350 -0.99604
30 0 -0.99745
30 10 -0.99686
30 20 -0.99529
30 30 -0.99278
30 40 -0.98942
30 50 -0.98537
30 60 -0.98080
30 70 -0.97595
30 80 -0.97102
30 90 -0.96622
30 100 -0.96171
30 110 -0.95763
30 120 -0.95404
30 130 -0.95098
30 140 -0.94842
30 150 -0.94634
30 160 -0.94475
30 170 -0.94365
30 180 -0.94309
30 190 -0.94316
30 200 -0.94395
30 210 -0.94551
30 220 -0.94785
30 230 -0.95095
30 240 -0.95471
30 250 -0.95900
30 260 -0.96367
30 270 -0.96853
30 280 -0.97344
30 290 -0.97823
30 300 -0.98277
30 310 -0.98691
30 320 -0.99052
30 330 -0.99349
30 340 -0.99570
30 350 -0.99704
40 0 -0.99973
40 10 -0.99855
40 20 -0.99515
40 30 -0.98957
40 40 -0.98198
40 50 -0.97261
40 60 -0.96178
40 70 -0.94988
40 80 -0.93730
40 90 -0.92446
40 100 -0.91170
40 110 -0.89936
40 120 -0.88770
40 130 -0.87697
40 140 -0.86741
40 150 -0.85926
40 160 -0.85286
40 170 -0.84853
40 180 -0.84663
40 190 -0.84741
40 200 -0.85100
40 210 -0.85732
40 220 -0.86608
40 230 -0.87684
40 240 -0.88906
40 250 -0.90218
40 260 -0.91567
40 270 -0.92906
40 280 -0.94198
40 290 -0.95413
40 300 -0.96525
40 310 -0.97514
40 320 -0.98362
40 330 -0.99049
40 340 -0.99557
40 350 -0.99870
50 0 -0.99822
50 10 -0.99614
50 20 -0.98981
50 30 -0.97929
50 40 -0.96479
50 50 -0.94669
50 60 -0.92548
50 70 -0.90173
50 80 -0.87609
50 90 -0.84919
50 100 -0.82165
50 110 -0.79406
50 120 -0.76705
50 130 -0.74130
50 140 -0.71760
50 150 -0.69696
50 160 -0.68052
50 170 -0.66947
50 180 -0.66488
50 190 -0.66738
50 200 -0.67706
50 210 -0.69334
50 220 -0.71512
50 230 -0.74097
50 240 -0.76936
50 250 -0.79890
50 260 -0.82839
50 270 -0.85690
50 280 -0.88375
50 290 -0.90848
50 300 -0.93074
50 310 -0.95028
50 320 -0.96683
50 330 -0.98017
50 340 -0.99002
50 350 -0.99612
60 0 -0.98327
60 10 -0.97987
60 20 -0.96916
60 30 -0.95122
60 40 -0.92640
60 50 -0.89528
60 60 -0.85861
60 70 -0.81728
60 80 -0.77225
60 90 -0.72447
60 100 -0.67489
60 110 -0.62449
60 120 -0.57437
60 130 -0.52585
60 140 -0.48065
60 150 -0.44091
60 160 -0.40915
60 170 -0.38792
60 180 -0.37938
60 190 -0.38472
60 200 -0.40386
60 210 -0.43537
60 220 -0.47683
60 230 -0.52529
60 240 -0.57777
60 250 -0.63164
60 260 -0.68479
60 270 -0.73567
60 280 -0.78320
60 290 -0.82667
60 300 -0.86562
60 310 -0.89966
60 320 -0.92846
60 330 -0.95165
60 340 -0.96880
60 350 -0.97948
70 0 -0.93784
70 10 -0.93265
70 20 -0.91587
70 30 -0.88772
70 40 -0.84885
70 50 -0.80029
70 60 -0.74333
70 70 -0.67940
70 80 -0.61001
70 90 -0.53664
70 100 -0.46074
70 110 -0.38380
70 120 -0.30751
70 130 -0.23393
70 140 -0.16570
70 150 -0.10605
70 160 -0.58708E-01
70 170 -0.27369E-01
70 180 -0.15059E-01
70 190 -0.23404E-01
70 200 -0.52162E-01
70 210 -0.99231E-01
70 220 -0.16109
70 230 -0.23348
70 240 -0.31212
70 250 -0.39319
70 260 -0.47360
70 270 -0.55104
70 280 -0.62388
70 290 -0.69098
70 300 -0.75152
70 310 -0.80483
70 320 -0.85026
70 330 -0.88706
70 340 -0.91444
70 350 -0.93161
80 0 -0.83577
80 10 -0.82843
80 20 -0.80429
80 30 -0.76395
80 40 -0.70874
80 50 -0.64057
80 60 -0.56170
80 70 -0.47456
80 80 -0.38152
80 90 -0.28485
80 100 -0.18662
80 110 -0.88899E-01
80 120 0.61719E-02
80 130 0.96112E-01
80 140 0.17796
80 150 0.24824
80 160 0.30315
80 170 0.33897
80 180 0.35274
80 190 0.34287
80 200 0.30954
80 210 0.25477
80 220 0.18202
80 230 0.95629E-01
80 240 0.14867E-03
80 250 -0.10017
80 260 -0.20167
80 270 -0.30144
80 280 -0.39722
80 290 -0.48725
80 300 -0.57007
80 310 -0.64432
80 320 -0.70863
80 330 -0.76146
80 340 -0.80125
80 350 -0.82644
90 0 -0.64612
90 10 -0.63686
90 20 -0.60599
90 30 -0.55482
90 40 -0.48577
90 50 -0.40206
90 60 -0.30732
90 70 -0.20513
90 80 -0.98827E-01
90 90 0.86836E-02
90 100 0.11490
90 110 0.21763
90 120 0.31479
90 130 0.40422
90 140 0.48353
90 150 0.55008
90 160 0.60105
90 170 0.63378
90 180 0.64612
90 190 0.63686
90 200 0.60599
90 210 0.55482
90 220 0.48577
90 230 0.40206
90 240 0.30732
90 250 0.20513
90 260 0.98827E-01
90 270 -0.86834E-02
90 280 -0.11490
90 290 -0.21763
90 300 -0.31479
90 310 -0.40422
90 320 -0.48353
90 330 -0.55008
90 340 -0.60105
90 350 -0.63378
100 0 -0.35274
100 10 -0.34287
100 20 -0.30954
100 30 -0.25477
100 40 -0.18202
100 50 -0.95629E-01
100 60 -0.14887E-03
100 70 0.10017
100 80 0.20167
100 90 0.30144
100 100 0.39722
100 110 0.48725
100 120 0.57007
100 130 0.64433
100 140 0.70863
100 150 0.76146
100 160 0.80125
100 170 0.82644
100 180 0.83577
100 190 0.82843
100 200 0.80429
100 210 0.76395
100 220 0.70874
100 230 0.64057
100 240 0.56170
100 250 0.47456
100 260 0.38152
100 270 0.28485
100 280 0.18662
100 290 0.88899E-01
100 300 -0.61720E-02
100 310 -0.96112E-01
100 320 -0.17796
100 330 -0.24824
100 340 -0.30315
100 350 -0.33896
110 0 0.15059E-01
110 10 0.23404E-01
110 20 0.52161E-01
110 30 0.99231E-01
110 40 0.16109
110 50 0.23348
110 60 0.31212
110 70 0.39319
110 80 0.47360
110 90 0.55104
110 100 0.62388
110 110 0.69098
110 120 0.75152
110 130 0.80483
110 140 0.85026
110 150 0.88706
110 160 0.91444
110 170 0.93161
110 180 0.93784
110 190 0.93265
110 200 0.91587
110 210 0.88772
110 220 0.84885
110 230 0.80029
110 240 0.74333
110 250 0.67940
110 260 0.61001
110 270 0.53664
110 280 0.46074
110 290 0.38380
110 300 0.30751
110 310 0.23393
110 320 0.16570
110 330 0.10605
110 340 0.58708E-01
110 350 0.27369E-01
120 0 0.37938
120 10 0.38472
120 20 0.40386
120 30 0.43537
120 40 0.47683
120 50 0.52529
120 60 0.57777
120 70 0.63164
120 80 0.68479
120 90 0.73567
120 100 0.78320
120 110 0.82667
120 120 0.86562
120 130 0.89966
120 140 0.92846
120 150 0.95165
120 160 0.96880
120 170 0.97948
120 180 0.98327
120 190 0.97987
120 200 0.96916
120 210 0.95122
120 220 0.92640
120 230 0.89528
120 240 0.85861
120 250 0.81728
120 260 0.77225
120 270 0.72447
120 280 0.67489
120 290 0.62449
120 300 0.57437
120 310 0.52585
120 320 0.48065
120 330 0.44091
120 340 0.40915
120 350 0.38792
130 0 0.66488
130 10 0.66738
130 20 0.67706
130 30 0.69334
130 40 0.71512
130 50 0.74096
130 60 0.76936
130 70 0.79890
130 80 0.82839
130 90 0.85690
130 100 0.88375
130 110 0.90848
130 120 0.93074
130 130 0.95028
130 140 0.96683
130 150 0.98017
130 160 0.99002
130 170 0.99612
130 180 0.99822
130 190 0.99614
130 200 0.98981
130 210 0.97929
130 220 0.96479
130 230 0.94669
130 240 0.92548
130 250 0.90173
130 260 0.87609
130 270 0.84919
130 280 0.82165
130 290 0.79406
130 300 0.76705
130 310 0.74130
130 320 0.71760
130 330 0.69696
130 340 0.68052
130 350 0.66947
140 0 0.84663
140 10 0.84741
140 20 0.85100
140 30 0.85732
140 40 0.86608
140 50 0.87684
140 60 0.88906
140 70 0.90218
140 80 0.91567
140 90 0.92906
140 100 0.94198
140 110 0.95413
140 120 0.96525
140 130 0.97514
140 140 0.98362
140 150 0.99049
140 160 0.99557
140 170 0.99870
140 180 0.99973
140 190 0.99855
140 200 0.99515
140 210 0.98957
140 220 0.98198
140 230 0.97261
140 240 0.96178
140 250 0.94988
140 260 0.93730
140 270 0.92446
140 280 0.91170
140 290 0.89936
140 300 0.88770
140 310 0.87697
140 320 0.86741
140 330 0.85926
140 340 0.85286
140 350 0.84853
150 0 0.94309
150 10 0.94316
150 20 0.94395
150 30 0.94551
150 40 0.94785
150 50 0.95095
150 60 0.95471
150 70 0.95900
150 80 0.96367
150 90 0.96853
150 100 0.97344
150 110 0.97823
150 120 0.98277
150 130 0.98691
150 140 0.99052
150 150 0.99349
150 160 0.99570
150 170 0.99704
150 180 0.99745
150 190 0.99686
150 200 0.99529
150 210 0.99278
150 220 0.98942
150 230 0.98537
150 240 0.98080
150 250 0.97595
150 260 0.97102
150 270 0.96622
150 280 0.96171
150 290 0.95763
150 300 0.95404
150 310 0.95098
150 320 0.94842
150 330 0.94634
150 340 0.94475
150 350 0.94365
160 0 0.98528
160 10 0.98519
160 20 0.98512
160 30 0.98510
160 40 0.98520
160 50 0.98546
160 60 0.98590
160 70 0.98655
160 80 0.98738
160 90 0.98837
160 100 0.98949
160 110 0.99068
160 120 0.99189
160 130 0.99305
160 140 0.99410
160 150 0.99499
160 160 0.99565
160 170 0.99604
160 180 0.99613
160 190 0.99591
160 200 0.99537
160 210 0.99455
160 220 0.99350
160 230 0.99228
160 240 0.99099
160 250 0.98969
160 260 0.98849
160 270 0.98744
160 280 0.98661
160 290 0.98600
160 300 0.98562
160 310 0.98541
160 320 0.98534
160 330 0.98534
160 340 0.98535
160 350 0.98533
170 0 0.99866
170 10 0.99862
170 20 0.99850
170 30 0.99833
170 40 0.99812
170 50 0.99789
170 60 0.99767
170 70 0.99747
170 80 0.99730
170 90 0.99719
170 100 0.99711
170 110 0.99709
170 120 0.99710
170 130 0.99713
170 140 0.99718
170 150 0.99723
170 160 0.99727
170 170 0.99728
170 180 0.99727
170 190 0.99723
170 200 0.99715
170 210 0.99706
170 220 0.99696
170 230 0.99688
170 240 0.99681
170 250 0.99679
170 260 0.99683
170 270 0.99692
170 280 0.99708
170 290 0.99729
170 300 0.99754
170 310 0.99782
170 320 0.99809
170 330 0.99832
170 340 0.99851
170 350 0.99862
180 0 0.99960
|
| CITATION_DESCRIPTION |
Evans, D.R., VG2-U-PRA-4-SUMM-BROWSE-48SEC-V1.0,
VG2 URA PRA RESAMPLED SUMMARY BROWSE 48SEC V1.0,
NASA Planetary Data System, 1993.
|
| ABSTRACT_TEXT |
This dataset consists of edited browse
data derived from an original dataset obtained from the Voyager 2
Planetary Radio Astronomy (PRA) instrument in the vicinity of Uranus.
Data are provided for 70 instrument channels covering the range from
1.2 kHz to 1326 kHz in uniform 19.2 kHz steps, each 1 kHz wide.
Data are included for the period 1986:019:00:00 through 1986:031:23:59.
|
| PRODUCER_FULL_NAME |
DR. DAVID R. EVANS
|
| SEARCH/ACCESS DATA |
Planetary Plasma Interactions Website
|
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