/********************* LECP INSTRUMENT **************************************/ /* MODIFICATIONS /* 920805 SJOY from JPLPDS::RMONARREZ 920527 /* received by mail /* 920814 EFRIED /* Capitalization of descriptions was changed from all UPPERCASE /* to normal format(UC -> LC). /* Inserted values for INST_MODE_DESC, REF_DESC, and /* AUTHOR_FULL_NAME. (All UC -> LC) /* Unknown value for SCAN_MODE_ID. /* 920916 EFRIED /* last changes made /* Template: Spacecraft Instrument Template - Rev: 19890121*/ /* Note: The following templates form part of a standard */ /* set for the submission of a spacecraft instrument */ /* to the PDS. */ /* */ /* Hierarchy: SCINSTRUMENT */ /* INSTINFO */ /* INSTDETECT */ /* INSTELEC */ /* INSTFILTER */ /* INSTOPTICS */ /* SCINSTOFFSET */ /* INSTSECTION */ /* INSTSECTINFO */ /* INSTSECTFOVS */ /* INSTSECTPARM */ /* INSTSECTDET */ /* INSTSECTELEC */ /* INSTSECTFILT */ /* INSTSECTOPTC */ /* INSTMODESECT */ /* INSTREFINFO */ /* REFERENCE */ /* REFAUTHORS */ /* */ OBJECT = SCINSTRUMENT SPACECRAFT_ID = "VG2" INSTRUMENT_ID = "LECP" OBJECT = INSTINFO INSTRUMENT_NAME = "LOW ENERGY CHARGED PARTICLE" INSTRUMENT_TYPE = "CHARGED PARTICLE ANALYZER" PI_PDS_USER_ID = "KRIMIGIS" NAIF_DATA_SET_ID = "N/A" BUILD_DATE = 1977-08-20 INSTRUMENT_MASS = 6.652000 INSTRUMENT_HEIGHT = UNK INSTRUMENT_LENGTH = UNK INSTRUMENT_WIDTH = UNK INSTRUMENT_MANUFACTURER_NAME = "THE JOHNS HOPKINS UNIVERSITY APPLIED PHYSICS LABORATORY" INSTRUMENT_SERIAL_NUMBER = "01" INSTRUMENT_DESC = " The low energy charged particle experiment employs a set of many solid state detectors arranged to characterize, with various levels of energy, directional, and compositional discriminations, the in-situ charged particle environment of the spacecraft, both within interplanetary and planetary magnetospheric regions. Electrons can be characterized, with various electron rate energy channels, between 22 keV and greater than 10 meV (mode dependent). Ions, without mass species discriminations, can be characterized with various ion rate energy channels between 28 keV and greater than 152 keV (mode dependent). Rate data is telemetered as simple counts per accumulation time period. The different channels correspond to different onboard energy discrimination windows (for ions the discrimination values are mass species dependent, leading to some ambiguity). Above about 200 keV/nucleon, the ions can be discriminated as to their mass species composition by the use of multiple parameter measurements. These measurements consist of the energies that individual particles deposit in more than one detector. This information is telemetered both as ion rate data, obtained by on-board species identification circuitry (with various channels representing various energy-species combinations), and as particle multiple parameters data, consisting of pulse-height-analysis values from each of the affected particle detectors for each analyzed particle. (A maximum of about 2 to 5 particles per second can be analyzed in this fashion due to telemetry limitations. A priority scheme avoids saturation by one species group. there are three such groups defined: atomic number z = 1,2 each group in a rotating fashion.) Angular information is obtained through mechanical rotation of the detectors. The main detectors look within a single scan plane that is rotated 360 degrees, stopping at 8 different look sectors (one of the sectors is blocked to obtain a background measurement: sector 8). The lower energy detectors have full width viewcones of about 45 degrees. The scan plane is oriented such that a line that passes exactly between sectors 8 and 1, and also exactly between sectors 4 and 5, is exactly parallel to the roll axis of the spacecraft (which nominally points at earth). When the roll orientation of the spacecraft is such that the star sensor is locked on canopus, the scan plane is tilted about 30 degrees out of the ecliptic plane, with sector 3 tilting towards north ecliptic (and also in the direction that is retrograde with respect to the planetary orbits). Sectors 1 and 8 point in the general direction of earth. The scan rate is variable between 48 seconds to 48 minutes per 360 degree scan. There are some electron detectors (whose properties are not as well established as the others) that view out of the scan plane described here (see Krimigis et al. 1977, Space Science Reviews, 21, p.329). Some of the data is subject to substantial contamination depending on the region under consideration. Before the data from this instrument can be used, it is vital that the contamination descriptions be examined ('CONTAMINATION_ DESC') for each contamination type ('CONTAMINATION_ID') and that the contaminations levels be determined ('DATA_QUALITY_ID' AND 'DATA_QUALITY_DESC'). While sector 8 is the background sector for most (and generally the most used) data channels, sector 4 is the background sector for some channels. Of those channels documented in this catalog, sector 4 is the background sector for channels: ESA0, ESB0, AB10, AB12, AB13, PSA1, PSA2, PSA3, PSB1, PSB2, AND PSB3." SCIENTIFIC_OBJECTIVES_SUMMARY = " Characterize the energy spectra, angular distributions, species composition, spatial structures, and temporal variations of the hot plasmas, energetic particles, and particulate radiation that exist in the vicinity of the outer planets (Jupiter, Saturn, Uranus, and Neptune) and within the interplanetary environment. To study the mechanisms by which such particles are energized and transported throughout such systems. To study in particular the energization and transport processes associated with hot plasmas and particulate radiation in the vicinity of planetary bow shocks, magnetopauses, magnetotail plasma sheets, inner radiation zones, the auroral zones, etc., and to study the interaction of such media with planetary satellites and the planetary atmospheres and ionospheres." INSTRUMENT_CALIBRATION_DESC = " The instrument was calibrated on the ground by placing it into beam chambers (e.g. Van DeGraf machines) and firing calibrated beams of known composition at it. Also, a radioactive source is positioned behind the 'sunshield' positioned at sector 8 for in-flight calibration of some detector- electronic gains. Also, the instrument has a calibration mode whereby pulses of known strength are sent into the pre-amplifier chains following the detectors. Information about calibration can be found in: Krimigis et al., Space Science Reviews, Vol. 21, p 329, 1977 et al., Journal Of Geophysical Research, Vol. 86, p 8227, 1981 Vol. 86, p 8343, 1981 Geophysical Research, Vol. 86, p 8301, 1981." OPERATIONAL_CONSID_DESC = " Instrument operates continuously sampling data over uniform accumulation intervals. The accumulation intervals are different for the different channels of information (almost 100 channels). The scan head of the LECP Instrument usually scans back-and-forth continuously (forward by 315 degrees and then back by 315 degrees). The scanning head pauses at 8 different scan sectors for periods ranging between 6 seconds and 48 seconds (for the encounter time periods) and takes about 0.5 seconds to scan between the sectors. Specially scanning modes for Voyager 2 at Uranus and Neptune have been developed whereby 1 or 2 quick scans are performed followed by 6 to 12 minutes of no scanning. Also, for Voyager 2 at Jupiter there was an extended period of no scanning. The roll orientation of the spacecraft is of crucial importance as to the type of data returned since that orientation determines the orientation of the scan plane of the LECP Instrument. That orientation also has safety consequences since a poor orientation could expose the LECP detectors to ring particulate damage." END_OBJECT = INSTINFO OBJECT = INSTDETECT DETECTOR_ID = "LECP" DETECTOR_TYPE = "SOLID STATE" DETECTOR_ASPECT_RATIO = 0.000000 MINIMUM_WAVELENGTH = "N/A" MAXIMUM_WAVELENGTH = "N/A" NOMINAL_OPERATING_TEMPERATURE = 273.000000 DETECTOR_DESC = " The LECP Instrument consists of a variety (about 28) of 'Solid State Detectors' that are used individually and in combinations (using coincidence and anti-coincidence criterion) to detect and characterize nuclear particles. The detector thicknesses range from 2 to 2450 microns to cover a very broad range of particle energy and mass characteristic." SENSITIVITY_DESC = " Detectors count particles that have appropriate discriminated characteristics with an efficiency that approaches 1. Therefore the sensitivity is strickly a function of the geometric factors of the detectors (geometric factors associated with different data channels are documented elsewhere in this catalog) and the energy and species band-widths of the data channels (also documented elsewhere). The geometric factors have units of area X Steradians (CM^2 X STR)." END_OBJECT = INSTDETECT OBJECT = INSTELEC ELECTRONICS_ID = "LECP" ELECTRONICS_DESC = " Timed accumulations of particle counts satisfying various analog pulse-height discrimination levels. Timed accumulations of particle counts satisfying simultaneous analog pulse-height discriminations for multiple detectors. Pulse-height analog-to-digital conversions from multiple, simultaneous detectors for direct telemetry." END_OBJECT = INSTELEC OBJECT = INSTFILTER FILTER_NUMBER = "N/A" FILTER_NAME = "N/A" FILTER_TYPE = "N/A" MINIMUM_WAVELENGTH = "N/A" CENTER_FILTER_WAVELENGTH = "N/A" MAXIMUM_WAVELENGTH = "N/A" MEASUREMENT_WAVE_CALBRT_DESC = "N/A" END_OBJECT = INSTFILTER OBJECT = INSTOPTICS TELESCOPE_ID = "N/A" TELESCOPE_FOCAL_LENGTH = "N/A" TELESCOPE_DIAMETER = "N/A" TELESCOPE_F_NUMBER = "N/A" TELESCOPE_RESOLUTION = "N/A" TELESCOPE_TRANSMITTANCE = "N/A" TELESCOPE_T_NUMBER = "N/A" TELESCOPE_T_NUMBER_ERROR = "N/A" TELESCOPE_SERIAL_NUMBER = "N/A" OPTICS_DESC = "N/A" END_OBJECT = INSTOPTICS OBJECT = SCINSTOFFSET PLATFORM_OR_MOUNTING_NAME = "SCIENCE BOOM" CONE_OFFSET_ANGLE = "N/A" CROSS_CONE_OFFSET_ANGLE = "N/A" TWIST_OFFSET_ANGLE = "N/A" INSTRUMENT_MOUNTING_DESC = " LECP Instrument is mounted on the science boom about half way between the boom's spacecraft anchor point and imaging scan platform. The mounting is such that the 360 degree scan plane of the LECP scanning head (not to be confused with the scanning of the imaging instruments) is coplanar with the spacecraft's roll axis. Also, on the canopus star lock the LECP scan plane is about 30 degrees rotated away from the ecliptic plane. A line passing between sectors 1 and 8, and between sectors 4 and 5, is parallel to the spacecraft roll axis. Sectors 1 and 8 point in the general direction or earth, and with the canopus lock, sector 3 points generally in the retrograde direction (referring to the direction with respect to the directions of motion of the orbiting planets) and about 30 degrees north of the ecliptic." END_OBJECT = SCINSTOFFSET OBJECT = INSTSECTION SECTION_ID = "LECP" OBJECT = INSTSECTINFO SCAN_MODE_ID = "UNK" DATA_RATE = 600.000000 SAMPLE_BITS = 10 TOTAL_FOVS = 8 OBJECT = INSTSECTFOVS FOV_SHAPE_NAME = "N/A" HORIZONTAL_PIXEL_FOV = "N/A" VERTICAL_PIXEL_FOV = "N/A" HORIZONTAL_FOV = "N/A" VERTICAL_FOV = "N/A" FOVS = 8 END_OBJECT = INSTSECTFOVS END_OBJECT = INSTSECTINFO OBJECT = INSTSECTPARM INSTRUMENT_PARAMETER_NAME = "ELECTRON RATE" MINIMUM_INSTRUMENT_PARAMETER = 0.000000 MAXIMUM_INSTRUMENT_PARAMETER = 0.000000 NOISE_LEVEL = 0.000000 INSTRUMENT_PARAMETER_UNIT = "COUNTS/SECOND" SAMPLING_PARAMETER_NAME = "ENERGY PER NUCLEON" MINIMUM_SAMPLING_PARAMETER = 0.022000 MAXIMUM_SAMPLING_PARAMETER = 20.000000 SAMPLING_PARAMETER_INTERVAL = 0.000000 SAMPLING_PARAMETER_RESOLUTION = 0.000000 SAMPLING_PARAMETER_UNIT = "MEV PER NUCLEON" END_OBJECT = INSTSECTPARM OBJECT = INSTSECTPARM INSTRUMENT_PARAMETER_NAME = "ELECTRON RATE" MINIMUM_INSTRUMENT_PARAMETER = 0.000000 MAXIMUM_INSTRUMENT_PARAMETER = 0.000000 NOISE_LEVEL = 0.000000 INSTRUMENT_PARAMETER_UNIT = "COUNTS/SECOND" SAMPLING_PARAMETER_NAME = "TIME" MINIMUM_SAMPLING_PARAMETER = 0.000000 MAXIMUM_SAMPLING_PARAMETER = 0.000000 SAMPLING_PARAMETER_INTERVAL = 0.000000 SAMPLING_PARAMETER_RESOLUTION = 0.000000 SAMPLING_PARAMETER_UNIT = "SECOND" END_OBJECT = INSTSECTPARM OBJECT = INSTSECTPARM INSTRUMENT_PARAMETER_NAME = "ION RATE" MINIMUM_INSTRUMENT_PARAMETER = 0.000000 MAXIMUM_INSTRUMENT_PARAMETER = 0.000000 NOISE_LEVEL = 0.000000 INSTRUMENT_PARAMETER_UNIT = "COUNTS/SECOND" SAMPLING_PARAMETER_NAME = "ATOMIC NUMBER" MINIMUM_SAMPLING_PARAMETER = 1.000000 MAXIMUM_SAMPLING_PARAMETER = 26.000000 SAMPLING_PARAMETER_INTERVAL = 0.000000 SAMPLING_PARAMETER_RESOLUTION = 0.000000 SAMPLING_PARAMETER_UNIT = "ATOMIC NUMBER" END_OBJECT = INSTSECTPARM OBJECT = INSTSECTPARM INSTRUMENT_PARAMETER_NAME = "ION RATE" MINIMUM_INSTRUMENT_PARAMETER = 0.000000 MAXIMUM_INSTRUMENT_PARAMETER = 0.000000 NOISE_LEVEL = 0.000000 INSTRUMENT_PARAMETER_UNIT = "COUNTS/SECOND" SAMPLING_PARAMETER_NAME = "ENERGY PER NUCLEON" MINIMUM_SAMPLING_PARAMETER = 0.028000 MAXIMUM_SAMPLING_PARAMETER = 152.000000 SAMPLING_PARAMETER_INTERVAL = 0.000000 SAMPLING_PARAMETER_RESOLUTION = 0.000000 SAMPLING_PARAMETER_UNIT = "MEV PER NUCLEON" END_OBJECT = INSTSECTPARM OBJECT = INSTSECTPARM INSTRUMENT_PARAMETER_NAME = "ION RATE" MINIMUM_INSTRUMENT_PARAMETER = 0.000000 MAXIMUM_INSTRUMENT_PARAMETER = 0.000000 NOISE_LEVEL = 0.000000 INSTRUMENT_PARAMETER_UNIT = "COUNTS/SECOND" SAMPLING_PARAMETER_NAME = "TIME" MINIMUM_SAMPLING_PARAMETER = 0.000000 MAXIMUM_SAMPLING_PARAMETER = 0.000000 SAMPLING_PARAMETER_INTERVAL = 0.000000 SAMPLING_PARAMETER_RESOLUTION = 0.000000 SAMPLING_PARAMETER_UNIT = "SECOND" END_OBJECT = INSTSECTPARM OBJECT = INSTSECTPARM INSTRUMENT_PARAMETER_NAME = "PARTICLE MULTIPLE PARAMETERS" MINIMUM_INSTRUMENT_PARAMETER = 0.000000 MAXIMUM_INSTRUMENT_PARAMETER = 0.000000 NOISE_LEVEL = 0.000000 INSTRUMENT_PARAMETER_UNIT = "MEV X MEV" SAMPLING_PARAMETER_NAME = "ATOMIC NUMBER" MINIMUM_SAMPLING_PARAMETER = 1.000000 MAXIMUM_SAMPLING_PARAMETER = 26.000000 SAMPLING_PARAMETER_INTERVAL = 0.000000 SAMPLING_PARAMETER_RESOLUTION = 0.000000 SAMPLING_PARAMETER_UNIT = "ATOMIC NUMBER" END_OBJECT = INSTSECTPARM OBJECT = INSTSECTDET DETECTOR_ID = "LECP" END_OBJECT = INSTSECTDET OBJECT = INSTSECTELEC ELECTRONICS_ID = "LECP" END_OBJECT = INSTSECTELEC OBJECT = INSTSECTFILT FILTER_NUMBER = "N/A" END_OBJECT = INSTSECTFILT OBJECT = INSTSECTOPTC TELESCOPE_ID = "N/A" END_OBJECT = INSTSECTOPTC END_OBJECT = INSTSECTION OBJECT = INSTMODEINFO INSTRUMENT_MODE_ID = "FAR ENCOUNTER" GAIN_MODE_ID = "N/A" DATA_PATH_TYPE = "UNK" INSTRUMENT_POWER_CONSUMPTION = 4.725000 INSTRUMENT_MODE_DESC = " Used in the vicinity of planetary encounters. High intensity detectors turned off (A, B, DELTA, DELTA PRIME). (Affected channels are documented in detailed level catalog.) Bit Rate allocated 1/3 for Particle Multiple Parameters (PMP) data, also called Pulse Height Analysis data, and 2/3 for Rate data (counts/second). Full composition discrimination capabilities enabled (in both Rate and PMP forms). Angular scanning is typically 6.4 minutes per 360 degree scan but is often changed. Scanning cyclics driven by the spacecraft computer are included. Experiment Bit Rate is 600 bits per second. Electrons measured up to 0.5 MEV. minimum sample time is 0.4 sec." OBJECT = INSTMODESECT SECTION_ID = "LECP" END_OBJECT = INSTMODESECT END_OBJECT = INSTMODEINFO OBJECT = INSTMODEINFO INSTRUMENT_MODE_ID = "FAR ENCOUNTER STOW" GAIN_MODE_ID = "N/A" DATA_PATH_TYPE = "UNK" INSTRUMENT_POWER_CONSUMPTION = 4.725000 INSTRUMENT_MODE_DESC = " This mode includes the Full Far Encounter Mode configuration with the exception that the angular scanning is halted so that the detectors are fixed looking into a non-standard direction. This direction is such that the detectors peek around a sun screen (which covers the sector 8 positon of the scan plane) having the effect of protecting the low energy ion and electron detectors by reducing their geometric factors. For the one application of this mode the geometric factor was reduced by a factor of 26 for the low energy ions (Alpha detector) and by an as yet uncalibrated factor for the electrons (Beta and Gamma detectors)." OBJECT = INSTMODESECT SECTION_ID = "LECP" END_OBJECT = INSTMODESECT END_OBJECT = INSTMODEINFO OBJECT = INSTMODEINFO INSTRUMENT_MODE_ID = "NEAR ENCOUNTER" GAIN_MODE_ID = "N/A" DATA_PATH_TYPE = "UNK" INSTRUMENT_POWER_CONSUMPTION = 4.525000 INSTRUMENT_MODE_DESC = " Sometimes used at the closest-in positions during a planetary encounter. The high intensity detectors are turned on (A, B, DELTA, DELTA PRIME). (Affected channels are documented in the detailed level catalog.) Particle Multiple Parameter (PMP) composition discrimination capabilities are turned off (including the rate channels derived from the multiple parameter information). All data appears in rate (counts/second) form. Angular scanning is typically 6.4 minutes per 360 degrees scan but is often changed. Scanning cyclics driven by the spacecraft computer are included. Experiment Bit Rate is 600 bits per second. Electrons are measured up to greater than 10 MEV. Minimum sample time is 0.4 sec." OBJECT = INSTMODESECT SECTION_ID = "LECP" END_OBJECT = INSTMODESECT END_OBJECT = INSTMODEINFO OBJECT = INSTMODEINFO INSTRUMENT_MODE_ID = "URANUS SCAN CYCLIC" GAIN_MODE_ID = "N/A" DATA_PATH_TYPE = "UNK" INSTRUMENT_POWER_CONSUMPTION = 4.725000 INSTRUMENT_MODE_DESC = " Data accumulated as with the Far Encounter Mode. Angular scanning controlled by spacecraft. Two quick full angular scans are obtained using 6 second scanning and lasting for 96 seconds total. In between these scan periods the sensors are held fixed looking in sector 7. The scan periods occur every 12 minutes." OBJECT = INSTMODESECT SECTION_ID = "LECP" END_OBJECT = INSTMODESECT END_OBJECT = INSTMODEINFO OBJECT = INSTREFINFO REFERENCE_KEY_ID = "KRIMIGISETAL1977" OBJECT = REFERENCE DOCUMENT_TOPIC_TYPE = "LECP DOCUMENTATION" JOURNAL_NAME = "SPACE SCIENCE REVIEWS" PUBLICATION_DATE = 1977 REFERENCE_DESC = " Krimigis, S. M., T. P. Armstrong, W.I. Axford, C. O. Bostrom, C. Y. Fan, G. Gloeckler, and L. J. Lanzerotti, The Low Energy Charged Particle (LECP) Experiment On The Voyager Spacecraft, Space Science Reviews, 21, 329 1977." OBJECT = REFAUTHORS AUTHOR_FULL_NAME = "DR. S. M. KRIMIGIS" END_OBJECT = REFAUTHORS END_OBJECT = REFERENCE END_OBJECT = INSTREFINFO OBJECT = INSTREFINFO REFERENCE_KEY_ID = "KRIMIGISETAL1981" OBJECT = REFERENCE DOCUMENT_TOPIC_TYPE = "LECP JUPITER DOCUMENTATION" JOURNAL_NAME = "JOURNAL OF GEOPHYSICAL RESEARCH" PUBLICATION_DATE = 1981 REFERENCE_DESC = " Krimigis, S. M., J. F. Carbury, E. P. Keath, C. O. Bostrom, W. I. Axford, G. Gloeckler, L. J. Lanzerotti, and T. P. Armstrong, Characteristics Of Hot Plasma In The Jovian Magnetosphere: Results From The Voyager Spacecraft, Journal Of Geophysical Research, 86, 8227, 1981." OBJECT = REFAUTHORS AUTHOR_FULL_NAME = "DR. S. M. KRIMIGIS" END_OBJECT = REFAUTHORS END_OBJECT = REFERENCE END_OBJECT = INSTREFINFO END_OBJECT = SCINSTRUMENT