Data Set Information
DATA_SET_NAME GO JUP HIC SURVEY ENERGETIC ION COUNT RATE V1.0
DATA_SET_ID GO-J-HIC-3-RDR-SURVEY-COUNTRATE-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Overview:=========This data set provides energetic (MeV) ion count rates and eventsmeasured by the Heavy Ion Counter (HIC) instrument on the Galileospacecraft. The data are derived from the raw real-time science (RTS)data. There are two basic types of data files associated with thefull-rate reduced data: Detector Count Rates and Events (Pulse Heights).Both types of files set are stored as ASCII tables, where the fileparameters are functions of time. Appropriate information concerningthe operation of the instrument can be found in Garrard, Gehrels andStone, Space Sci. Rev., 60, 305, 1992 [GARRARDETAL1992].This data set is highly discontinuous in time. Because of the severelimitations in the downlink capability of the Galileo spacecraft,data were acquired for only selected portions of each orbit. Duringthe prime mission (first 12 orbits), continuous data were acquiredinside of 50 Rj for all orbits, with a few select orbits havingcomplete or nearly complete coverage in the Real-Time Science (RTS)telemetry mode. During most of the Galileo Europa Mission (GEM) andGalileo Millennium Mission (GMM) coverage was more limited, typicallyonly a few days around perijove, except for the Cassini encounterperiod (orbits 28 and 29) and orbits where recorded data were lostdue to spacecraft safings or other mishaps. Table 1 below providesa 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 andorbital geometry. After the insertion orbit, which dipped as low asfive degrees south, the Galileo remained within a degree of thejovian 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 LocalOrb Date Date/Time Time Date Time-------------------------------------------------------------------J00 95-12-03 95-12-07 21:54 4.00 16:21 96-03-29 267.7 03:39G01 96-06-23 96-06-28 00:31 11.03 15:36 96-08-09 125.3 03:24G02 96-09-01 96-09-07 13:38 10.65 15:22 96-10-07 113.0 03:12C03 96-11-02 96-11-06 13:31 9.21 15:34 96-11-27 89.1 03:28E04 96-12-15 96-12-19 03:22 9.16 15:21 97-01-04 72.1 03:00J05* 97-01-15 97-01-20 00:26 9.05 14:54 97-02-04 72.1 02:48E06 97-02-16 97-02-20 20:55 9.12 14:28 97-03-14 89.2 02:20G07 97-03-30 97-04-04 11:03 9.12 14:14 97-04-21 75.9 01:56G08 97-05-04 97-05-08 11:42 9.27 13:29 97-06-02 100.2 01:21C09 97-06-22 97-06-27 11:52 10.77 12:35 97-08-08 143.0 00:21C10 97-09-14 97-09-18 23:10 9.17 12:44 97-10-13 98.9 00:36E11 97-11-02 97-11-06 23:02 9.03 12:36 97-11-26 84.1 00:29E12 97-12-15 97-12-16 06:35 8.80 12:29 97-12-20 46.6 00:37J13* 98-02-09 98-02-10 23:09 8.85 12:33 98-03-06 95.2 00:25E14 98-03-28 98-03-29 07:59 8.83 12:17 98-04-30 199.7 00:16E15 98-05-30 98-06-01 02:34 8.85 12:12 98-06-26 100.4 00:03E16 98-07-20 98-07-20 17:18 9.93 11:54 98-08-23 124.4 23:51E17 98-09-25 98-09-26 08:26 8.91 11:44 98-10-24 110.4 23:34E18 98-11-21 98-11-22 03:57 9.23 11:24 98-12-27 129.0 23:17E19 99-01-31 99-02-01 02:38 9.24 10:56 99-03-18 154.3 22:40C20 99-05-02 99-05-03 17:00 9.37 10:24 99-06-02 114.5 21:46C21 99-06-29 99-07-02 05:04 7.27 10:04 99-07-22 89.0 21:57C22 99-08-11 99-08-12 10:58 7.32 09:50 99-08-29 77.1 21:23C23 99-09-13 99-09-14 19:57 6.55 09:17 99-09-27 65.7 20:46I24 99-10-10 99-10-11 03:31 5.68 08:41 99-11-01 97.7 20:47I25 99-11-25 99-11-26 23:30 5.94 08:39 99-12-15 87.2 20:28E26 00-01-01 00-01-04 03:33 5.78 08:14 00-01-28 102.7 20:05I27 00-02-20 00-02-22 12:30 5.85 07:56 00-04-06 154.4 19:55G28 00-05-17 00-05-21 04:52 6.68 07:18 00-09-08 289.9 18:37G29 00-12-27 00-12-29 03:26 7.49 06:03 01-03-11 216.3 17:37C30 01-05-07 01-05-23 17:33 7.28 05:11 01-06-29 136.8 16:27I31 01-08-04 01-08-06 04:52 5.93 04:14 01-09-10 132.2 16:05I32 01-10-14 01-10-15 23:56 5.78 03:53 01-12-01 160.7 15:39I33 02-01-16 02-01-17 16:23 5.54 03:13 02-06-13 348.1 14:21A34 02-11-04 02-11-05 07:23 1.99 01:40 03-04-14 336.7 12:49J35 03-09-21 03-09-21 18: 1.00 * Solar conjunction - no data from this orbit ** Rj = 71492 kmProcessing:===========The data are processed from the level 2 data obtained from the QueryServer at JPL. The rate files are a level 3 product where the instrumentcounting rates have been converted into units of counts/second and aregiven at full time resolution.The event files are a level 3 product where the event data has beenextracted from the data stream, a nuclear charge (Z) of each event hasbeen 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 beginsaccumulation. One event per minor frame is selected (basedon a priority scheme) and transmitted to the spacecraft along with 2 - 3rates. Some of the less important / scientifically interesting rates aresubcommutated and thus only transmitted once every 16 HIC packets (1 HICpacket equals 3 minor frames equals 2 seconds). The data, with 2 secondtime resolution, consists of (up to) 3 events and 8 rates.The different rates respond to different energy ranges. These are given inMeV/nucleon (for oxygen) below:Rate Energy Range (MeV/nuc for oxygen)----------------------------------------------------------single LET E ratesLE1 15.1 - 25.3LE2 14.9 - 176.0LE3 15.4 - 192.0LE4 17.9 - 177.0LE5 44.8 - 185.0coincidence LET E ratesDUBL 17.0 - 18.0TRPL 18.0 - 24.0WDSTP 30.0 - 48.0WDPEN 48.0 - 185.0single LET B ratesLB1 1.9 - 5000.0LB2 1.9 - 7000.0LB3 2.1 - 13000.0LB4 16.6 - 95000.0coincidence LET B ratesLETB 4.8 - 17.5The rate data can be converted to fluxes using the geometry factorsgiven in the technical document included on this CD.Each event transmitted is tagged according to its event type. Thecorresponding event numbers are given below.Set of Event TYPEs------------------20 LETB Single21 LETB Double22 LETB Triple23 LETE Double24 LETE Triple25 LETE WDSTP26 LETE WDSTPL127 LETE WDPEN28 LETE WDPENL1It was determined that at times the LETB sensor was mistagging events.A check was implemented in the ground event processing to determinethe correct tag for a given event based on the returned pulse heights.An extended set of event types (given below) were created to indicatethose events which were originally mistagged. For these events no Z(nuclear charge) or livetime value is determined. It is possible togroup the events, based on the pulse heights, into 3 basiccompositional categories (S, Na or S, and O or Na or S).Extended Set of Event TYPEs---------------------------(Occasionally LETB events are mistagged. By examining thepulse heights the events can be reclassified.----------------------------------------------------------------30 = was a LETB single, now is a O/Na/S LETB single31 = was a LETB single, now is a Na/S LETB single32 = was a LETB single, now is a S LETB single33 = was a LETB double, now is a O/Na/S LETB single34 = was a LETB double, now is a Na/S LETB single35 = was a LETB double, now is a S LETB single36 = was a LETB triple, now is a O/Na/S LETB single37 = was a LETB triple, now is a Na/S LETB single38 = was a LETB triple, now is a S LETB single40 = was a LETB single, now is a LETB double41 = N/A42 = was a LETB triple, now is a LETB double50 = was a LETB single, now is a LETB triple51 = was a LETB double, now is a LETB triple52 = N/AAncillary Data:===============There are no ancillary data uniquely associated with the HICreduced data archive. However, the spacecraft trajectory andattitude data, and the As-run Spacecraft Events Files are usefulancillary 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 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 . 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.ColumnHeading Contents Format Example------- -------- ------ -------DateTime Year & DOY in IOC DateTime format. Year & Day of year. format: %4d-%02d-%02dT%02s:%02d:%06.2f example: 1994-05-22T17:23:56.123ZSCLK Derived from PB (Playback) %07ld:%02ld:0:0 3497588:00 level0 telemetry header data SCETRates Per The valid values are in counts %9.3f 1604.500Second 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
DATA_SET_RELEASE_DATE 2000-02-29T00:00:00.000Z
START_TIME 1996-06-27T12:42:00.000Z
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 IO PLASMA TORUS
GANYMEDE
IO
CALLISTO
AMALTHEA
EUROPA
JUPITER
TARGET_TYPE PLASMA CLOUD
SATELLITE
PLANET
INSTRUMENT_HOST_ID GO
INSTRUMENT_NAME HEAVY ION COUNTER
INSTRUMENT_ID HIC
INSTRUMENT_TYPE COSMIC RAY DETECTOR
NODE_NAME planetary plasma interactions
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE General:========The rate data has been thoroughly checked by the HIC team and includes thehighest resolution data available for this orbit. Please direct anyquestions regarding the generation or interpretation of the data toPDS_OPERATOR@jpl.nasa.gov.Specific:=========During the J0 orbit the coincidence requirement for the LETB rate was cycledfrom requiring 3 detectors to requiring 2 detectors to requiring only 1detector to be triggered. This changes the energy threshold of the rate from6.5 to 4.8 to 2.4 MeV/nucleon. The times of the coincidence requirementchanges are given below:Time Coincidence Requirement (changed to)-----------------------------------------------1995-12-07T16:58:28 3 detectors1995-12-07T17:07:00 2 detectors1995-12-07T17:15:34 1 detector1995-12-07T17:24:08 3 detectors1995-12-07T17:32:39 2 detectors1995-12-07T17:41:09 1 detector1995-12-07T17:49:43 3 detectors1995-12-07T17:58:14 2 detectors1995-12-07T18:06:43 1 detectorThe LETB detector was turned off at 1995-12-07T18:14:11.
CITATION_DESCRIPTION Cohen, C., Hamell, G., GO JUP HIC SURVEY ENERGETIC ION COUNT RATE V1.0, GO-J-HIC-3-RDR-SURVEY-COUNTRATE-V1.0, NASA Planetary Data System, 2000
ABSTRACT_TEXT 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).
PRODUCER_FULL_NAME DR. CHRISTINA COHEN
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