| DATA_SET_DESCRIPTION |
Data Set Overview
=================
This data set provides raw energetic (MeV) particle data
measured by the Heavy Ion Counter (HIC) instrument on the Galileo
spacecraft. These data were acquired during the following intervals
and recorded to tape:
Encounter data (higher time resolution)
Io and torus 1995-12-07(341), 15:30-18:25 UT
Perijove 1995-12-07(341) 23:18 - 1995-12-08(342) 01:24 UT
Ganymede 01 1996-06-27(179) 06:07 - 1996-06-30(182) 02:46 UT
Ganymede 02 1996-09-06(250) 18:33 - 1996-09-11(255) 03:18 UT
Callisto 03 1996-11-04(309) 13:15 - 1996-11-05(310) 07:44 UT
Europa 04 1996-12-19(354), 06:33-07:21 UT
Europa 06 1997-02-20(051), 16:37-21:47 UT
Ganymede 07 1997-03-30(089) 18:50 - 1997-04-05(095) 07:40 UT
Ganymede 08 1997-05-06(126) 13:00 - 1997-05-07(127) 16:22 UT
Callisto 09 1997-06-22(173) 12:00 - 1997-08-23(235) 16:08 UT
Callisto 10 1997-09-15(258) 00:17 - 1997-09-18(261) 23:21 UT
Europa 11 1997-11-06(310), 20:10-22:50 UT
Europa 12 1997-12-16(350), 11:43-12:28 UT
Europa 14 1998-03-29(088), 13:06-14:00 UT
Europa 15 1998-05-31(151), 20:43-21:42 UT
Europa 18 1998-12-10(344) 19:37 - 1998-12-11(245) 00:24 UT
Europa 19 1999-02-01(032), 01:50-02:39 UT
Callisto 20 1999-05-03(123), 16:00-18:00 UT
Callisto 21 1999-07-01(182) 23:53 - 1999-07-02(183) 01:50 UT
Callisto 22 1999-08-12(224), 03:27-13:07 UT
Callisto 23 1999-08-12(224) 12:37 - 1999-09-14(257) 21:29 UT
Io 24 1999-10-11(284), 03:42-04:48 UT
Io 25 1999-11-25(329), 23:22-23:59 UT
The first two intervals represent the data taken during the
Io/Jupiter 00 phase and are included in this data set for completeness
(originally released by PDS as data set ID:
GO-J-HIC-4-SUMM-I0ENERGETICIONCOMP-V1.0).
Orbit Data (Lower time resolution)
Ganymede 01 1996-06-27(179) 12:42 - 1996-08-24(237) 13:02 UT
Ganymede 02 1996-09-07(251) 04:11 - 1996-10-22(296) 09:01 UT
Callisto 03 1996-11-01(306) 23:55 - 1996-11-11(316) 17:44 UT
Europa 04 1996-12-15(350) 10:35 - 1996-12-25(360) 07:41 UT
Europa 06 1997-02-18(049) 16:56 - 1997-03-30(089) 04:18 UT
Ganymede 07 1997-03-30(089) 05:09 - 1997-05-04(124) 14:15 UT
Ganymede 08 1997-05-04(124) 14:25 - 1997-06-22(173) 14:52 UT
Callisto 09 1997-06-22(173) 15:18 - 1997-09-13(256) 21:57 UT
Callisto 10 1997-09-13(256) 22:49 - 1997-11-02(306) 13:13 UT
Europa 11 1997-11-02(306) 14:03 - 1997-11-09(314) 15:37 UT
Europa 12 1997-12-15(349) 08:02 - 1997-12-16(350) 20:08 UT
Europa 14 1998-03-28(087) 13:01 - 1998-03-31(090) 01:32 UT
Europa 15 1998-05-30(150) 21:01 - 1998-06-01(152) 21:26 UT
Europa 16 1998-07-20(201) 05:03 - 1998-09-19(262) 02:01 UT
Europa 17 1998-09-25(268) 04:14 - 1998-09-27(270) 01:05 UT
Europa 18 1998-11-21(325) 12:02 - 1998-12-30(364) 23:28 UT
Europa 19 1999-01-31(031) 02:01 - 1999-02-11(042) 03:43 UT
Callisto 20 1999-05-02(122) 17:01 - 1999-05-15(135) 03:47 UT
Callisto 21 1999-06-29(180) 07:02 - 1999-07-03(184) 10:14 UT
Callisto 22 1999-08-11(223) 14:02 - 1999-08-13(225) 18:30 UT
Callisto 23 1999-09-13(256) 20:02 - 1999-09-27(270) 14:50 UT
Io 24 1999-10-10(283) 04:01 - 1999-11-01(305) 16:56 UT
Io 25 1999-11-25(329) 04:01 - 1999-11-27(331) 00:48 UT
There are two basic types of data files associated with the raw data
archive: Packetized Telemetry (RAW) and Reformatted Raw Data
(UNCALIBRATED). The RAW data is the most primitive binary form
available to the instrument team. These data are reformatted into the
UNCALIBRATED data files which are ASCII (HEX) tables that are in turn
used by the HIC team to produce higher level data products. The
appropriate information concerning the operation of the instrument can
be found in Garrard, Gehrels and Stone, Space Sci. Rev., 60, 305, 1992
[GARRARDETAL1992].
Data Processing
===============
RAW DATA
--------
The data are raw binary packetized telemetry 2 data obtained from
the Query Server at JPL. No further processing has been done.
Every 2 seconds the HIC instrument zeros the rate counters and
begins accumulation. In playback data 3 events per minor frame are
selected (based on a priority scheme) and transmitted to the
spacecraft along with 2 - 3 rates. Some of the less important /
scientifically interesting rates are subcommutated and thus only
transmitted once every 16 HIC packets (1 HIC x packet equals minor
frames). In realtime data the rate counters are x accumulated for a
series (the number of which depends on the bit rate) of 2 second
intervals, while up to 60 events (selected by assigned priority) are
transmitted during this accumulation period.
Additional information on data processing can be found in the Space
Research Lab technical document 86-02 (''Science Requirements
Document'', [GARRARD1985] which is included on the archive volume in
the DOCUMENTS directory.
The different rates respond to different energy ranges. These are
given in MeV/nucleon (for oxygen) below:
Rate Energy Range (MeV/nuc for oxygen)
----------------------------------------------------------
single LET E rates
LE1 15.1 - 25.3
LE2 14.9 - 176.0
LE3 15.4 - 192.0
LE4 17.9 - 177.0
LE5 44.8 - 185.0
coincidence LET E rates
DUBL 17.0 - 18.0
TRPL 18.0 - 24.0
WDSTP 30.0 - 48.0
WDPEN 48.0 - 185.0
single LET B rates
LB1 1.9 - 5000.0
LB2 1.9 - 7000.0
LB3 2.1 - 13000.0
LB4 16.6 - 95000.0
coincidence LET B rates
LETB 4.8 - 17.5
The logic conditions and approximate energy ranges for the
other rates are given below.
Energy Range
Rate Logic (MeV/nuc for oxygen)
-----------------------------------------------------------------
DUBL LE1.LE2.LE3* 17.0 - 18.0
TRPL LE1.LE2.LE3.LE4* 18.0 - 24.0
WDSTP LE2.LE3.LE4.LE5* 30.0 - 48.0
WDPEN LE2.LE3.LE4.LE5 48.0 - 185.0
LETB LB1.LB2.LB3.LB4* 4.8 - 17.5
X.Y = logical AND of X and Y
X* = logical NOT X
UNCALIBRATED DATA
-----------------
The HIC instrument team included uncalibrated unprocessed data files
as part of their data submission. These files are not meant for
users of this product but for archiving the data files used by the
HIC team to produce the higher quality products.
Ancillary Data
==============
There are no ancillary data uniquely associated with the HIC
raw data archive. However, the spacecraft trajectory and
attitude data, and the As-run Spacecraft Events Files that are
provided on the same archive volume as these data are useful
ancillary products for users of the HIC data.
Coordinate System
==================
These are scalar data.
Software
========
There is no software provided with this archive.
Media/Format
============
Encounter Data:
----------------------------------------------------------------------
RAW DATA
---------
The data are stored in a rather complex and compact binary form
called an IPF (Instrument Packet File). The details of where all of
the bits are located are contained in Galileo project documents
(3-280, 3-310, SFDU_DOC). These documents are included on the
archive volumes with the data.
UNCALIBRATED DATA
-----------------
This is an ASCII text file originally consisting of variable length
data records. To make the records comply with PDS standards, blank
spaces were added to fill in when a record did not have a full set
of 3 data sets (see below).
These files contain rate and event data which are relatively
unprocessed and uncalibrated.
The first 15 data fields are consistent for each record in the data
file. These 15 fields contain information pertaining to: date, time,
observation modes and rate data. Optional event data may appear
after the rate data.
Example of 2 records (remember these lines may show on your display
as wrapped):
1995-12-07T15:30:08.439Z 3209036:84:0:0 S 200 1 000 -99 -99 -99 0 3833
29 3305 16577 T 4c2 035 153 027 T 5c6 168 0f3 100
1995-12-07T15:30:09.735Z 3209036:86:0:0 S 200 2 000 7 1 1 0 3993
29 3033 17473 T f48 06c 012 0f8 T 4c2 044 161 1d6 T b48 019 015 282
The fields are in the following order (Internal - SRL format):
Field Contents Format Example
----- -------- ------ -------
1 Year & DOY in IOC DateTime
format. Year & Day of year.
Derived from PB (Playback)
level0 telemetry header data SCET
format: %4d-%02d-%02dT%02s:%02d:%06.2f
example: 1994-05-22T17:23:56.123Z
2 Derived from PB (Playback) %09ld 3209036:84:0:0
level0 telemetry header
data SCET
3 ''S'' %s S
4 acstat %03d 204
5 Sub-commutator status %2d 11
6 cdbits %03O 043
7 DUBL %5ld 0
8 TRPL %5ld 0
9 WDSTP %5ld 1
10 WDPEN %4ld 0
11 LETB %6ld 2
12 le1 %6ld 1
13 rate7 %6ld 2
14 rate8 %6ld 19
OPTIONAL FIELD DATA
-------------------
If this data is present, it will occur in one, two or three sets of
five-tuples.
Example Five-tuple:
T f48 015 013 175 T b48 008 009 159 T b48 005 010 1ea
Field Contents Format Example
----- -------- ------ -------
16, 21, 26 ''T'' %s T
17, 22, 27 tag %03x f48
18, 23, 28 PHA3 %03x 015
19, 24, 29 PHA2 %03x 013
20, 25, 30 PHA1 %03x 175
Orbit Data:
--------------------------------------------------------------------
RAW DATA
-------
The data are stored in a rather complex and compact binary form
called an IPF (Instrument Packet File). The details of where all of
the bits are located are contained in Galileo project documents
(3-280, 3-310, SFDU_DOC). These documents are included on the
archive volumes with the data.
UNCALIBRATED DATA
-----------------
This is an ASCII text file consisting of header lines followed by
data blocks.
The first six lines are header lines.
Data blocks follow the header lines. Each data block may consist of
up to three sections.
HEADER LINES
------------
Example:
SCET: 1997-09-13T22:48:51.149Z
SCLK: 4129489:00:0:0
TYPE: RT Level1b
DATE: 2000-01-14T17:27:23Z
Note: the 5th and 7th header lines are blank lines. The sixth line
contains the column names. In the example above, the sixth line has
a string length of 119 and may show above as wrapped.
1st Header Line:
---------------
SCET: 1997-09-13T22:48:51.149Z 15 = Caution events
Field Content Format
----- ------- ------
1 Literal 'SCET: '
2 DateTime of 1st data PDS
3 Number of caution events '%6ld'
4 Literal ' = Caution events'
2nd Header Line:
---------------
SCLK: 317832879
Field Content Format
----- ------- ------
1 Literal 'SCLK: '
2 Value of SCLK '%9ld'
3rd Header Line:
---------------
TYPE: RT Level1b
Field Content Format
----- ------- ------
1 Literal 'TYPE: RT Level1b'
4th Header Line:
---------------
DATE: 2000-01-14T16:16:46Z
Field Content Format
----- ------- ------
1 Literal 'DATE: '
2 This file's Creation Date PDS
Header Lines 5 & 6 are blank.
-----------------
DATA BLOCKS
-----------
Each Data Block consists of three sections.
The first section is rate data. This section will always be ten
lines followed by an optional blank line.
The optional second section is event data. If present, it may have
up to 23 lines followed by an optional blank line.
The third section is a summary of events.
SECTION 1 (Rate Data)
----------
This section has 10 lines. Only the first line will contain the
date/time and SCET information for this data block. The rest of the
first line has the same 14 data fields as the next nine lines.
Example of 1st 2 lines of a Rate Data section:
1) 1997-09-13T22:48:51.149Z 4129489:00:0:0 152 0 253
0 253 3 253 3 152 0 253 4625
16 218625
2) 152 0 253
0 253 2 253 3 151 0 253 4529
15 206337
The columns are in the following order (Internal - SRL format):
Column
Heading Contents Format Example
------- -------- ------ -------
DateTime ISO DateTime, PDS Format
format: %4d-%02d-%02dT%02s:%02d:%06.3f
example: 1995-12-07T15:30:08.439Z
SCLK Derived from RT (Real-time) %09ld:00:0:0 4129489:00:0:0
level0 telemetry header
data SCET
DUBL Each of these headings %6ld %7ld 252 4
TRPL has two columns. The left
WDSTP column is the number of
WDPEN times the on-board counter
LETB was read-out. The right
LEMUX column is the accumulated
LBMUX sum of the on-board counter
values when read-out.
SECTION 2 (Optional Event Data)
---------
This section contains zero to 90 four-tuples of data. The
four-tuples are grouped three to a line. The last line of this
section may have one, two or three four-tuples in it.
Four-tuple Example:
5 172 290 312 6 92 196 288 8 92 224 0
Field Contents Format Example
----- -------- ------ -------
1 *Event type %2d 10
2 PHA3 %2ld 0
3 PHA2 %2ld 23
4 PHA1 %2ld 182
* Event types:
1 L1 WDSTP 8 !L1 WDPEN
2 LETB Single 9 Double (and 'caution')
3 LETB Double 10 LETB Double
4 LETB Triple 11 LETB Triple
5 Triple 12 Triple
6 !L1 WDSTP 13 L1 WDSTP
7 L1 WDPEN 14 !L1 WDSTP
SECTION 3 (Event Summary)
---------
This section has only one data line followed by an optional blank
line. Either of these lines may be the last line in the data file.
This section is typically followed by the beginning of another Data
Block.
Note: the E of ECNT starts in character position 28
(where the 1st character of the line is character 1).
Example: ECNT 67 2 14 10 361 0
Field Contents Format Example
----- -------- ------ -------
1 'ECNT' %s ECNT
2 Sum of Double events %7ld 67
(Type 9)
3 Sum of Triple events %7ld 2
(Types 5 & 12)
4 Sum of WDSTP events %7ld 14
(Types 1, 6, 13 & 14)
5 Sum of WDPEN events %7ld 10
(Types 7 & 8)
6 Sum of LETB events %7ld 361
(Types 2, 3, 4, 10 & 11)
7 Literal zero %7ld 0
References
===========
Garrard, T.L., N. Gehrels, E.C. Stone, The Galileo Heavy Element
Monitor, Space Sci. Rev., 60, 305, 1992.
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