Data Set Information
|
| DATA_SET_NAME |
GO J PWS REFORMATTED PLAYBACK SPECTRUM ANALYZER FULL V1.0
|
| DATA_SET_ID |
GO-J-PWS-2-REDR-LPW-SA-FULL-V1.0
|
| NSSDC_DATA_SET_ID |
|
| DATA_SET_TERSE_DESCRIPTION |
Full resolution electric and magnetic wave spectra obtained by the
Galileo PWS instrument at Jupiter. The data set includes the
electric and magnetic field spectral densities in units of
V**2/m**2/Hz and nT**2/Hz respectively.
|
| DATA_SET_DESCRIPTION |
This data set includes full resolution electric and magnetic wave
spectra from the Galileo plasma wave receiver recorded during
Jupiter orbital operations. In addition waveform
survey data (uncalibrated) and all instrument housekeeping data are
included. The parameters provided for the electric field
spectral data are uncalibrated data numbers. Software and
calibration tables provided as part of this data set allow for fully
calibrated data for the electric field measurements in raw data
numbers, voltage at the antenna inputs (V), electric field (V/m),
electric field spectral density (V**2/m**2/Hz), or power flux
(W/m**2/Hz). The sources of these data are the High Frequency
Receiver, Sweep Frequency Receiver, and Spectrum Analyzer which make
up the Low Rate Science portion of the PWS. During the included
time interval, all receivers were connected to the electric antenna.
Hence, the temporal resolution for electric measurements is
18.67 seconds. Note that the lowest 14 High Frequency Receiver
channels are sampled twice per 18.67 seconds while the remaining
channels are sampled only once. The four Spectrum Analyzer channels
are each sampled 7 times in an 18.67 sec interval.
The waveform survey data are generated by the wideband receiver
portion of the Plasma Wave Instrument. These data are 4-bit
measurements of the voltage across the preamplifier input at a rate
of 201.6 k, 25.2 k or 3.2 k samples per second (for the 80 kHz, 10
kHz, and 1 kHz bandwidth modes, respectively) using either the
electric dipole or magnetic search coil antennas. An automatic gain
control receiver is used to set the gain at an optimum value so as
to make the best use of the limited dynamic range afforded by the
4-bit analog-to-digital converter. In principle, it is possible to
use the Automatic Gain Control (AGC) readout contained in the data
set to calibrate this voltage, but this capability does not
currently exist for this data set.
This data set is highly discontinuous in time. Because of the severe
limitations in the downlink capability of the Galileo spacecraft,
LPW rate data were recorded only for targeted observations. Most
of these data were acquired near the Galilean moons, although
selected observations were made in various locations around the
magnetosphere. Table 1 below provides a listing of the start and
stop times of the recorded data segments, organized according to.
where the data were acquired.
-----------------------------------------------------------------
Table 1. PWS LPW Resolution Data Coverage
-----------------------------------------------------------------
Io Flybys:
-----------------------------------------------------------------
Dur. Jup Range Local Time S3 WLON
Obs. ID Start Time (min) (Rj) (hours) (deg). Note
-----------------------------------------------------------------
I00 IO 95-12-07 15:21 184 5.4- 7.7 10.6-12.3 204-290
I24 IO 99-10-11 03:42 66 5.7- 6.0 10.1-10.9 59- 87 2
I25 IO N/A 1
I27 IO 00-02-22 13:04 81 5.9- 6.0 8.4- 9.4 64- 97
I31 IO 01-08-06 04:25 64 5.9 3.9- 4.7 145-171
I32 IO 01-10-16 01:06 73 5.9- 6.1 4.8- 5.7 253-283
I33 IO N/A 1
Europa Flybys:
-----------------------------------------------------------------
Dur. Jup Range Local Time S3 WLON
Obs. ID* Start Time (min) (Rj) (hours) (deg). Note
-----------------------------------------------------------------
E04 EUR 96-12-19 06:33 51 9.4- 9.5 16.6-16.9 147-173
E06 EUR 97-02-20 16:37 312 9.5- 9.1 12.8-14.8 326-125
E11 EUR 97-11-06 20:09 162 9.0- 9.4 10.8-11.9 211-294
E12 EUR 97-12-16 11:42 46 9.4- 9.6 14.5-14.8 107-131
E14 EUR 98-03-29 13:05 55 9.4- 9.6 14.3-14.7 176-204
E15 EUR 98-05-31 20:42 61 9.4- 9.6 9.9-10.3 277-308
E16 EUR N/A 1
E18 EUR N/A 1
E19 EUR 99-02-01 01:49 50 9.2- 9.4 9.7-10.0 245-270
E26 EUR 00-01-03 17:29 61 9.2- 9.7 2.8- 3.1 346- 18
Ganymede Flybys:
-----------------------------------------------------------------
Dur. Jup Range Local Time S3 WLON
Obs. ID Start Time (min) (Rj) (hours) (deg). Note
-----------------------------------------------------------------
G01 GAN 96-06-27 06:07 45 14.9-15.2 11.2-11.3 163-188
G02 GAN 96-09-06 18:32 56 14.8-15.2 10.7-10.9 143-174
G07 GAN 97-04-05 06:44 56 14.8-15.2 19.7-19.8 5- 37
G08 GAN 97-05-07 15:36 46 14.8-15.1 8.1- 8.2 276-302
G28 GAN 00-05-20 09:40 60 14.7-15.3 0.7- 0.8 335- 9
G29 GAN 00-12-28 07:57 57 14.7-15.2 23.9- 0.0 205-237
Callisto Flybys:
-----------------------------------------------------------------
Dur. Jup Range Local Time S3 WLON
Obs. ID Start Time (min) (Rj) (hours) (deg). Note
-----------------------------------------------------------------
C03 CALL 96-11-04 13:15 45 26.1-26.4 7.8 231-258
C09 CALL 97-06-25 13:25 46 26.1-26.4 5.5 47- 74
C10 CALL 97-09-16 23:49 60 26.0-26.4 5.0- 5.1 318-354
C30 CALL 01-05-25 11:09 36 26.2-26.5 13.1-13.2 68- 89
Amalthea Flyby:
-----------------------------------------------------------------
Dur. Jup Range Local Time S3 WLON
Obs. ID Start Time (min) (Rj) (hours) (deg). Note
-----------------------------------------------------------------
A34 AMA 02-11-05 02:44 231 6.2- 2.3 6.4- 3.0 102-149
Inner Magnetosphere:
-----------------------------------------------------------------
Dur. Jup Range Local Time S3 WLON
Obs. ID Start Time (min) (Rj) (hours) (deg). Note
-----------------------------------------------------------------
J00 PJOV 12-07-95 23:22 124 4.0- 5.2 18.4-20.5 18- 62
I24 TOR N/A 1
I32 TOR 01-10-15 22:55 33 5.8- 5.9 3.0- 3.4 198-211
I25 TOR 99-11-25 21:07 174 5.9- 7.0 5.1- 7.0 336- 53 2
A34 PSX7 02-11-05 01:05 90 6.3- 7.7 17.7-18.2 24- 70
C23 PJOV 99-09-14 14:36 412 6.5- 7.7 6.1-10.3 52-239
C21 PJOV 99-07-01 23:53 113 7.6- 8.2 7.4- 8.3 247-301
C22 PJOV 99-08-12 08:18 288 7.3- 7.6 8.4-11.0 225- 0
E11 EQX (see E11 EUR) 3
I32 RAMP 01-10-15 15:31 115 7.8-8.9 22.9-23.7 354- 52
C10 EQX 97-09-18 22:34 46 9.2 12.5-12.8 102-125
C20 PJOV 99-05-03 15:59 122 9.4 10.0-10.8 45-106
A34 PSX6 02-11-04 21:48 45 10.3 17.0-17.1 285-300
Middle Magnetosphere:
-----------------------------------------------------------------
Dur. Jup Range Local Time S3 WLON
Obs. ID Start Time (min) (Rj) (hours) (deg). Note
-----------------------------------------------------------------
C09 TAR 97-06-28 13:50 61 18.1-18.5 18.1-18.2 324-359
C03 TAR 96-11-05 07:04 40 19.3-19.0 8.9- 9.0 140-163
G08 QRS 97-05-06 13:00 129 25.0-25.8 5.9- 6.0 63-140
G01 PSX 96-06-30 02:00 46 27.2-27.5 22.8 292-319
A34 PSX2 02-11-03 15:28 45 29.4-29.0 15.6 276-303
A34 PSX1 02-11-03 10:38 45 31.8-31.4 15.5 102-132
G02 PSX 96-09-11 02:38 40 39.2-39.4 23.8-23.9 121-145
G07 PSX 97-03-30 18:49 46 46.2-46.4 4.8 125-152
Magnetotail:
-----------------------------------------------------------------
Dur. Jup Range Local Time S3 WLON
Obs. ID Start Time (min) (Rj) (hours) (deg). Note
-----------------------------------------------------------------
C09 DSK1 97-07-04 14:09 118 64 22.1 99-170
C09 DSK2 97-07-14 10:03 45 107 23.2 357- 25
E18 DSK 98-12-10 19:36 288 109 22.5 285- 98
C09 DSK3 97-07-23 13:11 46 129 23.7 18- 45
C09 DAWN 97-08-23 14:07 122 130 0.9- 1.0 17- 90
C09 APJ 97-08-07 11:06 101 143 0.3 30- 91
* The ID element is derived from the SEF identifier for the
recorded observation. The recording identifiers translate to:
IO, GAN, EUR, CALL - satellites
PSX - plasma sheet crossing
TAR - trans-auroral region
QRS - quarter rotation survey
DSK - dusk side of orbit (see local time)
DAWN - dawn side of orbit (see local time)
APJ - apojove
TOR - Io torus
EQX - magnetic equator crossing
PJOV - perijove
RAMP - outer torus
These designations were defined by the sequence team.
Notes:
1 = Recording lost due to spacecraft safing/anomaly
2 = Stats given for primary observation interval only, data file.
includes additional intervals of 'ridealong' data.
3 = E11 EUR and EQU are continuous and listed as a single
observation.
Table 2 provides a listing of the various satellite closest
approach times and the location of the spacecraft, relative to
the satellite at these times.
------------------------------------------------------------
Table 2. Satellite Flyby Characteristics*
------------------------------------------------------------
Satellite Planetocentric Coords
Range Lat E Lon
Orb Moon C/A Time (Rm**) (deg) (deg) Note
------------------------------------------------------------
0 IO 95-12-07 17:45:58 1.50 -9.6 258.9 W
24 IO 99-10-11 04:33:03 1.34 4.5 135.9 U
27 IO 00-02-22 13:46:41 1.11 18.5 157.4 U
31 IO 01-08-06 04:59:21 1.11 77.5 187.7 P
32 IO 01-10-16 01:23:21 1.10 -78.5 135.3 P
33 IO 02-01-17 14:08:28 1.06 -43.5 41.8 F
4 EUR 96-12-19 06:52:58 1.45 -1.7 322.4 F
6 EUR 97-02-20 17:06:10 1.38 -17.0 34.7 F
11 EUR 97-11-06 20:31:44 2.31 25.7 218.7 F
12 EUR 97-12-16 12:03:20 1.13 -8.7 134.4 U
14 EUR 98-03-29 13:21:05 2.06 12.2 131.2 U
15 EUR 98-05-31 21:12:57 2.62 15.0 225.4 W
19 EUR 99-02-01 02:19:50 1.93 30.5 28.1 U
26 EUR 00-01-03 17:59:43 1.22 -47.1 83.4 U
1 GAN 96-06-27 06:29:07 1.32 30.4 246.7 W
2 GAN 96-09-06 18:59:34 1.10 79.3 236.4 P
7 GAN 97-04-05 07:09:58 2.18 55.8 270.4 W
8 GAN 97-05-07 15:56:10 1.61 28.3 84.8 U
28 GAN 00-05-20 10:10:10 1.31 -19.0 92.4 U
29 GAN 00-12-28 08:25:27 1.89 62.2 269.0 P
3 CALL 96-11-04 13:34:28 1.47 13.2 282.3 W
9 CALL 97-06-25 13:47:50 1.17 2.0 101.0 U
10 CALL 97-09-17 00:18:55 1.22 4.6 281.3 W
30 CALL 01-05-25 11:23:58 1.06 13.6 254.6 W
34 AMA 02-11-05 06:18:40 2.89 -47.7 74.8 U
* Satellite encounters with recorded data only
** Moon Rm (km)
=======================
Amalthea 86.2
Io 1818
Europa 1560
Ganymede 2634
Callisto 2409
Notes: Negative latitudes are southern hemisphere,
U = upstream
F = flank
W = wake
P = polar
|
| DATA_SET_RELEASE_DATE |
1997-01-01T00:00:00.000Z
|
| START_TIME |
1995-12-07T03:21:00.000Z
|
| STOP_TIME |
2003-09-21T06:45:00.000Z
|
| MISSION_NAME |
GALILEO
|
| MISSION_START_DATE |
1977-10-01T12:00:00.000Z
|
| MISSION_STOP_DATE |
2003-09-21T12:00:00.000Z
|
| TARGET_NAME |
GANYMEDE
IO
CALLISTO
EUROPA
JUPITER
|
| TARGET_TYPE |
SATELLITE
SATELLITE
SATELLITE
SATELLITE
PLANET
|
| INSTRUMENT_HOST_ID |
GO
|
| INSTRUMENT_NAME |
|
| INSTRUMENT_ID |
|
| INSTRUMENT_TYPE |
|
| NODE_NAME |
Planetary Plasma Interactions
|
| ARCHIVE_STATUS |
ARCHIVED
|
| CONFIDENCE_LEVEL_NOTE |
This data set includes all available Low Rate Science spectrum
analyzer data within the interval of time covered. Included in this
data set are data quality flags which indicate whether the parity of
the data value was good or bad. A bad parity flag indicates an
error in the data value and the software provided with this data set
will ignore such values. However, this is a simple parity scheme,
hence, even numbers of bit errors will not be flagged as being bad.
The magnetic spectra contain narrowband interference lines at 2.4
kHz and harmonics. Magnetic interference between about 200 Hz and 2
kHz is occasionally observed and is attributed to the use of a
grating motor in the UVS instrument. Missing data are indicated by
zero.
At about 1712 SCET on 14 September (day 257) 1997 the low-frequency
search coil, or some portion of the PWS electronics associated with
the signals acquired by this sensor suffered a failure which
increased the noise level and decreased the sensitivity for magnetic
signals below 2.4 kHz. Some natural signals can be observed in this
frequency range after the failure, but no attempt has been made as
of this date to recalibrate the output of this sensor. After some
on-board testing of the affected systems it was decided to only use
the search coils inside of about 15 RJ for the duration of the
mission. Inside this distance, it is most likely that intense
electromagnetic signatures might still be detected in the anomalous
sensor state. Outside of 15 RJ, the instrument is in an electric
field-only mode.
In the electric field-only mode, every 18.67-second sweep of the
spectrum analyzer and medium frequency receiver is from the electric
dipole antenna, effectively improving the temporal resolution of
the electric field measurements below 100 kHz by a factor of two.
The high frequency receiver above 100 kHz also sweeps once per 18.67
seconds, only on the electric antenna.
|
| CITATION_DESCRIPTION |
Gurnett, D.A., Kurth, W.S., Granroth, L.J.,
GO J PWS REFORMATTED PLAYBACK SPECTRUM ANALYZER FULL V1.0,
GO-J-PWS-2-REDR-LPW-SA-FULL-V1.0, NASA Planetary Data System, 1997
|
| ABSTRACT_TEXT |
This data set includes full resolution electric and magnetic wave
spectra from the Galileo plasma wave receiver recorded during
Jupiter orbital operations. In addition waveform
survey data (uncalibrated) and all instrument housekeeping data are
included. The parameters provided for the electric field
spectral data are uncalibrated data numbers. Software and
calibration tables provided as part of this data set allow for fully
calibrated data for the electric field measurements in raw data
numbers, voltage at the antenna inputs (V), electric field (V/m),
electric field spectral density (V**2/m**2/Hz), or power flux
(W/m**2/Hz). The sources of these data are the High Frequency
Receiver, Sweep Frequency Receiver, and Spectrum Analyzer which make
up the Low Rate Science portion of the PWS.
|
| PRODUCER_FULL_NAME |
DR. WILLIAM S. KURTH
|
| SEARCH/ACCESS DATA |
Planetary Plasma Interactions Website
|
|
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