Data Set Information
|
| DATA_SET_NAME |
GO JUPITER EPD REFORMATTED HIGH RES SECTOR V1.0
|
| DATA_SET_ID |
GO-J-EPD-2-REDR-HIGHRES-SECTOR-V1.0
|
| NSSDC_DATA_SET_ID |
|
| DATA_SET_TERSE_DESCRIPTION |
This data set contains high time
resolution data for the Galileo Energetic Particle Detector
at various sampling rates. All data obtained from the Io flyby
(December 1995) to end of mission are contained in this data set.
|
| DATA_SET_DESCRIPTION |
This data set contains two versions of three different data file
types. One version is a corrected form of the other ('C'). The
corrected data are adjusted for minute gaps in between the detector
cycles. Each version contains the following types:
16 sector (64 channel) at 1.25s time resolution
32 sector (16 channel) at 0.6s time resolution
64 sector (8 channel) at 0.3s time resolution
This data ranges from the Io flyby (December 1995) to end of mission.
All available motor positions are provided. Step 0, which looks behind
the background shield, is included for an indication of the background
penetration of the detector. The rates reported are in units of
(counts/sec), pitch and phase angles are in (radians). The sectors are
ordered in time.
Pitch angle is the angle between the look direction of the detector
and the observed magnetic field. Phase angle is the angle measured from
the x-axis to the projection of the look direction onto the xy plane
of a local magnetic coordinate system where the z-axis is the magnetic
field direction, the x-axis lies in a plane defined by the direction of
corotation and the z-axis, and y completes the set of the right hand
coordinate system.
Transform Counts/Sec-> Differential Flux:
Given the count rate R, pass band of the particle dE, and the
geometrical factor G of the detector it is possible to calculate
(dE and G are available in the EPD instrument template) differential
flux j=R/(G dE). For example, given a rate 3000 counts/sec for channel
E2, we find in the EPD instrument template that
dE= (0.055-0.042)=.013 MeV, G=.035 cm**2 Sr.
This gives a differential flux of 6.59 10**06 (cm**2 MeVs Sr)**-1.
For more detailed information about the Io encounter and the energetic
particle data included in this browse set see Electron Beams and Ion
Composition Measured at Io and its Torus by Williams et al., Science Vol.
274, 309-464, 18 Oct 1996.
[WILLIAMSETAL1996].
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. 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 4
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 4
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 4
C09 DSK2 97-07-14 10:03 45 107 23.2 357- 25 4
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.
** LPW coverage indicates time periods that were recorded in LPW
format. Not all data files span entire recorded interval.
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.
4 = No data available for this interval.
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 |
1999-06-25T00:00:00.000Z
|
| START_TIME |
1995-12-07T03:21:00.000Z
|
| STOP_TIME |
2003-09-21T06:22:00.000Z
|
| MISSION_NAME |
GALILEO
|
| MISSION_START_DATE |
1977-10-01T12:00:00.000Z
|
| MISSION_STOP_DATE |
2003-09-21T12:00:00.000Z
|
| TARGET_NAME |
IO PLASMA TORUS
GANYMEDE
IO
CALLISTO
AMALTHEA
EUROPA
JUPITER
|
| TARGET_TYPE |
PLASMA CLOUD
SATELLITE
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 |
The data in this set is a product of the processing done by the
Galileo Energetic Particles Detector Archive Processor (EPDPROC1991).
Data in this browse set includes all the data available for LEMMS
rates with data quality flag 0 (bad) and 1 (good). Rates with a data
quality flag of 0 are set to -1.0, all other rates have a data
quality flag of 1 including rates of 0.000. The error bars for each
rate is calculated from the standard deviation (SD) formula for a
distribution of particles following Poisson statistics
(n=number of counts) SD=+-n/Sqrt(n). The EPD team has not yet come up
with a consistent way to remove the background from the data. Close
attention should be paid to the step 0 count rate. The difference in
count rate between the foreground (step 1-7) and the background
(step 0) will give an indication of the validity of this data. For
example, several times during the Io encounter the Galileo Space Craft
stepped behind the background shield (step 0). There was little or no
reduction in rate for the higher energy electron channels F0 to F3 from
the foreground. This indicates that they are dominated by background.
|
| CITATION_DESCRIPTION |
Williams, D.J., Armstrong, T.P., McEntire, R.W.,
GO JUPITER EPD REFORMATTED HIGH RES SECTOR V1.0,
GO-J-EPD-2-REDR-HIGHRES-SECTOR-V1.0, NASA Planetary Data System, 1999
|
| ABSTRACT_TEXT |
This data set contains two versions of three different data file
types. One version is a corrected form of the other ('C'). The
corrected data are adjusted for minute gaps in between the detector
cycles. This data ranges from the Io flyby (December 1995) to end of
mission. All available motor positions are provided. Step 0, which
looks behind the background shield, is included for an indication of
the background penetration of the detector. The rates reported are in
units of (counts/sec), pitch and phase angles are in (radians). The
sectors are ordered in time
|
| PRODUCER_FULL_NAME |
DR. THOMAS P. ARMSTRONG
|
| SEARCH/ACCESS DATA |
Planetary Plasma Interactions Website
|
|
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