NASA Logo, National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive Header

GO JUP HIC SURVEY ENERGETIC ION COUNT RATE V1.0 (PDS)

NSSDCA ID: PSFP-00290

Availability: Archived at NSSDC, accessible from elsewhere

Description

This description was generated automatically using input from the Planetary Data System. Overview: ========= This data set provides energetic (MeV) ion count rates and events measured by the Heavy Ion Counter (HIC) instrument on the Galileo spacecraft. The data are derived from the raw real-time science (RTS) data. There are two basic types of data files associated with the full-rate reduced data: Detector Count Rates and Events (Pulse Heights). Both types of files set are stored as ASCII tables, where the file parameters are functions of time. Appropriate information concerning the operation of the instrument can be found in Garrard, Gehrels and Stone, Space Sci. Rev., 60, 305, 1992 [GARRARDETAL1992]. This data set is highly discontinuous in time. Because of the severe limitations in the downlink capability of the Galileo spacecraft, data were acquired for only selected portions of each orbit. During the prime mission (first 12 orbits), continuous data were acquired inside of 50 Rj for all orbits, with a few select orbits having complete or nearly complete coverage in the Real-Time Science (RTS) telemetry mode. During most of the Galileo Europa Mission (GEM) and Galileo Millennium Mission (GMM) coverage was more limited, typically only a few days around perijove, except for the Cassini encounter period (orbits 28 and 29) and orbits where recorded data were lost due to spacecraft safings or other mishaps. Table 1 below provides a listing of the start and stop times of the data for each orbit. Some orbits (5 and 13) have no coverage due to solar conjunctions. Table 2 below provides basic information about the orbits and orbital geometry. After the insertion orbit, which dipped as low as five degrees south, the Galileo remained within a degree of the jovian equator. ----------------------------------------------------------------Table 1. RTS Data Coverage ---------------------------------------------------------------Orbit Start Time Stop Time Notes ---------------------------------------------------------------JA-Io 1995-12-07 15:21 1995-12-08 01:26 J00 1996-05-23 20:02 1996-06-01 00:30 G01 1996-06-23 16:02 1996-07-04 00:00 G01 1996-08-07 00:00 1996-08-24 14:27 1 G02 1996-08-31 10:50 1996-10-22 10:02 C03 1996-10-31 12:07 1996-11-11 18:31 E04 1996-12-13 19:17 1996-12-21 15:07 J05 2 E06 1997-02-17 06:01 1997-02-26 04:49 G07 1997-03-19 05:42 1997-04-21 16:01 G08 1997-05-04 00:31 1997-06-22 00:00 C09 1997-06-22 00:00 1997-09-14 00:00 3 C10 1997-09-14 00:00 1997-10-04 00:00 3 E11 1997-11-02 01:24 1997-11-09 16:01 E12 1997-12-15 08:05 1997-12-16 12:29 J13 2 E14 1998-03-28 13:02 1998-03-31 02:12 E15 1998-05-30 21:04 1998-06-01 09:10 E16 1998-07-20 05:09 1998-07-21 00:00 E16 1998-07-24 00:00 1998-09-19 03:01 4 E17 1998-09-25 11:09 1998-09-27 01:59 E18 1998-11-21 12:04 1998-12-31 00:00 E19 1999-01-31 02:08 1999-02-02 00:00 E19 1999-02-11 00:00 1999-02-11 05:59 C20 1999-05-02 17:06 1999-05-15 04:04 C21 1999-06-29 07:05 1999-07-03 10:48 C22 1999-08-11 14:06 1999-08-14 10:34 C23 1999-09-13 20:05 1999-09-27 16:31 I24 1999-10-10 04:05 1999-11-01 17:58 I25 1999-11-25 04:05 1999-11-27 01:32 E26 2000-01-01 23:31 2000-01-05 01:55 E26 2000-02-20 03:33 2000-02-21 00:00 3 I27 2000-02-21 00:00 2000-02-23 18:05 G28 2000-05-19 04:06 2000-06-14 00:00 G28 2000-10-26 00:00 2000-12-27 00:00 5 G29 2000-12-27 00:00 2001-02-05 19:56 5,3 C30 2001-05-23 12:02 2001-05-26 08:28 I31 2001-08-05 05:18 2001-08-07 16:32 I32 2001-10-14 02:10 2001-10-27 00:00 I33 2002-01-04 00:00 2002-01-15 00:00 I33 2002-10-26 13:32 2002-11-03 00:00 3 A34 2002-11-03 00:00 2002-11-05 06:32 J35 2003-09-21 08 2003-09-21 18 6 Notes: 1 Data collected inbound to the beginning of next orbit 2 No data - solar conjunction 3 Data continuous with previous orbit 4 Additional data returned after spacecraft safing 5 Joint observation with Cassini 6 Times approximate, Jupiter impact ------------------------------------------------------------------Table 2. Galileo Orbit Information ------------------------------------------------------------------Orbit <--- Periapsis Info ----> <-- Apoapsis Info --> Start Periapsis Range Local Apoapsis Range Local Orb Date Date/Time <Rj**> Time Date <Rj> Time ------------------------------------------------------------------J00 95-12-03 95-12-07 21:54 4.00 16:21 96-03-29 267.7 03:39 G01 96-06-23 96-06-28 00:31 11.03 15:36 96-08-09 125.3 03:24 G02 96-09-01 96-09-07 13:38 10.65 15:22 96-10-07 113.0 03:12 C03 96-11-02 96-11-06 13:31 9.21 15:34 96-11-27 89.1 03:28 E04 96-12-15 96-12-19 03:22 9.16 15:21 97-01-04 72.1 03:00 J05* 97-01-15 97-01-20 00:26 9.05 14:54 97-02-04 72.1 02:48 E06 97-02-16 97-02-20 20:55 9.12 14:28 97-03-14 89.2 02:20 G07 97-03-30 97-04-04 11:03 9.12 14:14 97-04-21 75.9 01:56 G08 97-05-04 97-05-08 11:42 9.27 13:29 97-06-02 100.2 01:21 C09 97-06-22 97-06-27 11:52 10.77 12:35 97-08-08 143.0 00:21 C10 97-09-14 97-09-18 23:10 9.17 12:44 97-10-13 98.9 00:36 E11 97-11-02 97-11-06 23:02 9.03 12:36 97-11-26 84.1 00:29 E12 97-12-15 97-12-16 06:35 8.80 12:29 97-12-20 46.6 00:37 J13* 98-02-09 98-02-10 23:09 8.85 12:33 98-03-06 95.2 00:25 E14 98-03-28 98-03-29 07:59 8.83 12:17 98-04-30 199.7 00:16 E15 98-05-30 98-06-01 02:34 8.85 12:12 98-06-26 100.4 00:03 E16 98-07-20 98-07-20 17:18 9.93 11:54 98-08-23 124.4 23:51 E17 98-09-25 98-09-26 08:26 8.91 11:44 98-10-24 110.4 23:34 E18 98-11-21 98-11-22 03:57 9.23 11:24 98-12-27 129.0 23:17 E19 99-01-31 99-02-01 02:38 9.24 10:56 99-03-18 154.3 22:40 C20 99-05-02 99-05-03 17:00 9.37 10:24 99-06-02 114.5 21:46 C21 99-06-29 99-07-02 05:04 7.27 10:04 99-07-22 89.0 21:57 C22 99-08-11 99-08-12 10:58 7.32 09:50 99-08-29 77.1 21:23 C23 99-09-13 99-09-14 19:57 6.55 09:17 99-09-27 65.7 20:46 I24 99-10-10 99-10-11 03:31 5.68 08:41 99-11-01 97.7 20:47 I25 99-11-25 99-11-26 23:30 5.94 08:39 99-12-15 87.2 20:28 E26 00-01-01 00-01-04 03:33 5.78 08:14 00-01-28 102.7 20:05 I27 00-02-20 00-02-22 12:30 5.85 07:56 00-04-06 154.4 19:55 G28 00-05-17 00-05-21 04:52 6.68 07:18 00-09-08 289.9 18:37 G29 00-12-27 00-12-29 03:26 7.49 06:03 01-03-11 216.3 17:37 C30 01-05-07 01-05-23 17:33 7.28 05:11 01-06-29 136.8 16:27 I31 01-08-04 01-08-06 04:52 5.93 04:14 01-09-10 132.2 16:05 I32 01-10-14 01-10-15 23:56 5.78 03:53 01-12-01 160.7 15:39 I33 02-01-16 02-01-17 16:23 5.54 03:13 02-06-13 348.1 14:21 A34 02-11-04 02-11-05 07:23 1.99 01:40 03-04-14 336.7 12:49 J35 03-09-21 03-09-21 18: 1.00 * Solar conjunction - no data from this orbit ** Rj = 71492 km Processing: =========== The data are processed from the level 2 data obtained from the Query Server at JPL. The rate files are a level 3 product where the instrument counting rates have been converted into units of counts/second and are given at full time resolution. The event files are a level 3 product where the event data has been extracted from the data stream, a nuclear charge (Z) of each event has been calculated along with the appropriate livetime and geometry factor. The energy deposited in each of three detectors is also given in MeV. Every 2 seconds the HIC instrument zeros the rate counters and begins accumulation. One event per minor frame is 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 packet equals 3 minor frames equals 2 seconds). The data, with 2 second time resolution, consists of (up to) 3 events and 8 rates. 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 rate data can be converted to fluxes using the geometry factors given in the technical document included on this CD. Each event transmitted is tagged according to its event type. The corresponding event numbers are given below. Set of Event TYPEs -----------------20 LETB Single 21 LETB Double 22 LETB Triple 23 LETE Double 24 LETE Triple 25 LETE WDSTP 26 LETE WDSTPL1 27 LETE WDPEN 28 LETE WDPENL1 It was determined that at times the LETB sensor was mistagging events. A check was implemented in the ground event processing to determine the correct tag for a given event based on the returned pulse heights. An extended set of event types (given below) were created to indicate those events which were originally mistagged. For these events no Z (nuclear charge) or livetime value is determined. It is possible to group the events, based on the pulse heights, into 3 basic compositional categories (S, Na or S, and O or Na or S). Extended Set of Event TYPEs --------------------------(Occasionally LETB events are mistagged. By examining the pulse heights the events can be reclassified. ---------------------------------------------------------------30 = was a LETB single, now is a O/Na/S LETB single 31 = was a LETB single, now is a Na/S LETB single 32 = was a LETB single, now is a S LETB single 33 = was a LETB double, now is a O/Na/S LETB single 34 = was a LETB double, now is a Na/S LETB single 35 = was a LETB double, now is a S LETB single 36 = was a LETB triple, now is a O/Na/S LETB single 37 = was a LETB triple, now is a Na/S LETB single 38 = was a LETB triple, now is a S LETB single 40 = was a LETB single, now is a LETB double 41 = N/A 42 = was a LETB triple, now is a LETB double 50 = was a LETB single, now is a LETB triple 51 = was a LETB double, now is a LETB triple 52 = N/A Ancillary Data: =============== There are no ancillary data uniquely associated with the HIC reduced data archive. However, the spacecraft trajectory and attitude data, and the As-run Spacecraft Events Files 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: ============= Event Data: ----------The Event data are stored as a simple ASCII data table. The first 18 lines of the original data file consisted of a header that has been moved to the PDS label (file and data info sections). The header contained summary information describing the 12 columns of data. The summary includes: - Count of adjustments by event type Occasionally portions of data required for processing at this level is missing from instrument records. In these cases a default 'livetime' value has been supplied. The number of times this 'adjustment' was performed is reported by event type. - Count of events by event type Event TYPE values that fall within the set (see below for explanation of the set) of expected values are counted. The accumulated count of these events are reported here by event type. - Number of bad event types Only certain values are expected in the TYPE field. Event TYPE values falling outside the set of expected values are counted. The accumulated count of these events are reported here. Each data line consists of a PDS date/time string, an spacecraft clock (SLK) counter string and 10 numeric fields. These fields are all floating point with the exception of the 'DateTime', 'SCLK' and 'TYPE' columns. The data are contained in ASCII format. The columns are in the following order: Column Heading Contents Format Example ------- -------- ------ ------DateTime Spacecraft Event Time (SCET) in UTC, derived from PB (Playback) level0 telemetry header data format: %4d-%02d-%02dT%02s:%02d:%06.3f example: 1995-12-07T15:30:08.439Z SCLK Spacecraft clock from %07ld:%02ld:0:0 3497588:00 raw telemetry header TYPE Telescope ID with which the %2d 23 event is associated. For set of values and definitions, see below. e1 Energy (MeV) deposited in %8.2f 15.63 the e1 detector e2 Energy (MeV) deposited in %8.2f 15.63 the e2 detector e3 Energy (MeV) deposited in %8.2f 15.63 the e3 detector <z> Estimated nuclear charge %8.2f 7.52 of particle. Note: incomplete or no data 99.90 is indicated by the special value of 99.90 dz Difference of 2 calculations %8.2f 0.54 of nuclear charge; indicates approximate error in <z>. Eavg Rough estimate of incident %10.4f 122.10 energy of particle. SCTHavg Rough estimate of secant of %10.4f 122.10 of incident angle of particle. livetime livetime (in seconds) %11.4 0.5333 appropriate for the event; calculated from the ratio of rates to telemetered events. gf Geometry factor appropriate %8.4 0.4293 for the event type. The logic conditions and approximate energy ranges for the other rates are given below. Rate Logic Energy Range (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 WDSTPL1 LE1.LE2.LE3.LE4.LE5* 30.0 - 48.0 (has smaller geometry factor than WDSTP) WDPEN LE2.LE3.LE4.LE5 48.0 - 185.0 WDPENL1 LE1.LE2.LE3.LE4.LE5 48.0 - 185.0 (has smaller geometry factor than WDPEN) LETB (20) LB1.LB4* 2.4 - 17.5 LETB (21) LB1.LB2.LB4* 4.8 - 17.5 LETB (22) LB1.LB2.LB3.LB4* 6.5 - 17.5 X.Y = logical AND of X and Y X* = logical NOT X Pulse height energies are returned for only 3 detectors, which 3 depends on the event type: Event Type PHA3 detector PHA2 detector PHA1 detector ----------------------------------------------------------------------DUBL ----- LE1 LE2 TRPL LE3 LE1 LE2 WDSTP and WDSTPL1 LE3 LE4 LE2 WDPEN LE3 LE4+LE5 LE2 LETB LB3 LB2 LB1 Event types (and extended types) are described above in the Data Processing section. Rate Data: ---------The Rate data are stored as a simple ASCII data table. The first 4 lines of the original data file consisted of a header that has been moved to the PDS label (file and data info sections). The header contained summary column headings for the 17 columns of data plus some summary data. The summary typically consists of a descriptor and an identifier in the form: xxx: yyy where xxx is a single word descriptor and yyy is an identifier. Examples: TYPE: PB2R DATE: 96/02/25 Rate data are stored in 3 different files, all covering the same time range (SURVEY_RATE_LOW_RES, SURVEY_RATE_LOW_RES, SURVEY_RATE_LOW_RES ) The records in each file contain the same style of time index but have different rate counters in each file (see below). Data were delivered from the spacecraft with multiple samples per data packet. Each data packet contains only one spacecraft clock (SCLK) value. SCLK is only provided for records where it is known to be accurate. A counter internal to the HIC instrument was used to produce times for the other samples. Column Heading Contents Format Example ------- -------- ------ ------DateTime Year & DOY in IOC DateTime format. Year & Day of year. format: %4d-%02d-%02dT%02s:%02d:%06.2f example: 1994-05-22T17:23:56.123Z SCLK Derived from PB (Playback) %07ld:%02ld:0:0 3497588:00 level0 telemetry header data SCET Rates Per The valid values are in counts %9.3f 1604.500 Second per second units. A no-data value -99.0 is shown as a negative number. Different rates are contained in the 3 files (RT_RA file) DUBL Rates of respective types LETB (see below). These are sampled at the highest resolution (RT_RB file) TRPL Rates of respective types WDSTP (see below). These are sampled WDPEN at medium resolution LE1 LB1 (RT_RC file) LB2 Rates of respective types LB3 (see below). These are sampled LB4 at the lowest resolution LE2 LE3 LE4 LE5 Explanation of Rates: --------------------The LET E logic conditions and approximate energy ranges for the other rates are given below. Rate Logic Energy Range (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.LB4* 4.8 - 17.5 X.Y = logical AND of X and Y X* = logical NOT X LE1, LE2, LE3, LE4, LE5, LB1, LB2, LB3 and LB4 are single detector rates which respond in the approximate energy ranges given below. Rate Energy Range (MeV/nuc for oxygen) ----------------------------------------------------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 LB1 1.9 - 5000.0 LB2 1.9 - 7000.0 LB3 2.1 - 13000.0 LB4 16.6 - 95000.0

Alternate Names

  • GO-J-HIC-3-RDR-SURVEY-COUNTRATE-V1.0

Discipline

  • Planetary Science: Fields and Particles

Additional Information

Spacecraft

Experiments

Questions and comments about this data collection can be directed to: Dr. Edwin V. Bell, II

 

Personnel

NameRoleOriginal AffiliationE-mail
Prof. Edward C. Stone, Jr.Data ProviderCalifornia Institute of Technologyecs@srl.caltech.edu
Dr. Christina CohenGeneral ContactCalifornia Institute of Technologycohen@srl.caltech.edu
[USA.gov] NASA Logo - nasa.gov