Data Set Information
DATA_SET_NAME STARDUST C/E/L DUST FLUX MONITOR INSTRUMENT-2-EDR-V1.0
DATA_SET_ID STARDUST-C/E/L-DFMI-2-EDR-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Stardust Dust Flux Monitor Instrument Data Description: : Data Set Overview: : This volume contains dust events collected during the early cruise phase by the Dust Flux Monitor Instrument (DFMI) flown onboard the STARDUST satellite. The data in this archive are organized into two ASCII tables, using the same record layout. The first table, dfmicru001.tab, provides data readout at the ''CRUISE'' rate (as often as 10 Hz but as infrequently as every 20 minutes). The second table, dfmienc001.tab, provides test data readout at the ''ENCOUNTER'' rate (as often as 10 Hz but at least every second). Instrument Description: : The Dust Flux Monitor Instrument (DFMI) will carry out quantitative measurements of particle impact rate and particle mass distribution throughout the flyby of Comet Wild-2. There are two PVDF sensor units, each measuring different mass densities, as well as two acoustic sensors. Please refer to both the DFMI Calibration report and the papers provided in the /EXTRAS directory on this archive. General notes regarding fields of the data tables: : * Strings appear in quotes. * Integers and PDS times do not require quotes. * If a field is unknown, UNK may be entered. * If a field is not applicable, N/A may be entered. Definition of the fields in the data tables: : EVENT_SEQUENCE_NUMBER: The number associated with an event in the file DFMICRU001.TAB, with 1 being the first event recorded and n being the n'th event recorded. SPACECRAFT_UTC_TIME: The time at which data was obtained in UTC. SPACECRAFT_CLOCK_TIME: The time at which data was obtained in seconds from 1980-01-01T00:00:00. DFMI_CLOCK_TIME: The time at which data was obtained, with one second resolution. This 16 bit counter rolls over to 0 after 65535. DFMI_SYNC: This column should be equal to A5, the sync value for the DFMI data stream. DFMI_MODE: Indicates if DFMI is in calibration or normal mode. Valid values are NORM, IFC1, IFC2, IFC3, IFC4. See DFMI Calibration Document for more details. DFMI_READOUT_RATE: Indicates the Readout rate: valid values are CRUISE and ENCOUNTER. Cruise indicates that DFMI will read out data as often as 10Hz but as little as every 20 minutes. Encounter indicates that data will be read out as often as 10Hz, but at least every second. DFMI_WATCHDOG_RESET: Indicates that a watchdog reset prompted the reset of the DFMI computer. This value will only remain set for a single readout period. DFMI_SMALL_SENSOR_GAIN: DFMI small sensor sensitivity is either HIGH or LOW. If this value is High, the sensitivity relay is off and the small sensor is in the low mass range. If this value is Low, the relay is on and the sensor is set to the high mass range. In the high mass range, all electronic thresholds for the small dust sensor are a factor 10 greater than the low mass values. See the DFMI Calibration Document for more details. DFMI_ACOUSTIC_BUMPERLOW: Acoustic Bumper Low is an 8-bit counter associated with low threshold of impact sensor 1, also known as the Bumper acoustic sensor. DFMI_ACOUSTIC_BUMPERHIGH: Acoustic Bumper High is an 8-bit counter associated with high threshold of impact sensor 1, also known as the Bumper acoustic sensor. DFMI_ACOUSTIC_NEXTELLOW: Acoustic Nextel Low is an 8-bit counter associated with low threshold of impact sensor 2, also known as the Nextel acoustic sensor. DFMI_ACOUSTIC_NEXTELHIGH: Acoustic Nextel High is an 8-bit counter associated with low threshold of impact sensor 1, also known as the Nextel acoustic sensor. DFMI_CCC1_LARGEM1: CCC1 is a 16-bit counter associated with the first (lowest) large threshold M1. See DFMI Calibration Document for more details. DFMI_CCC2_LARGEM2: CCC2 is a 16-bit counter associated with the second large sensor threshold M2. See DFMI Calibration Document for more details. DFMI_CCC3_LARGEM3: CCC3 is a 16-bit counter associated with the third large sensor threshold M3. See DFMI Calibration Document for more details. DFMI_CCC4_LARGEM4: CCC4 is a 16-bit counter associated with the fourth large sensor threshold M4. See DFMI Calibration Document for more details. DFMI_CCC5_SMALLM1: CCC5 is a 16-bit counter associated with the first (lowest) small sensor threshold m1. See DFMI Calibration Document for more details. DFMI_CCC6_SMALLM2: CCC6 is a 16-bit counter associated with the second small sensor threshold m2. See DFMI Calibration Document for more details. DFMI_CCC7_SMALLM3: CCC7 is a 16-bit counter associated with the third small sensor threshold m3. See DFMI Calibration Document for more details. DFMI_CCC8_SMALLM4: CCC8 is a 16-bit counter associated with the fourth small sensor threshold m4. See DFMI Calibration Document for more details. DFMI_EB_TEMP: Temperature of the DFMI Electronics Box, measured in Kelvin units. DFMI_SU_TEMP: Temperature of the DFMI Sensor Unit, measured in Kelvin. DFMI_HEATER_POWER: Power condition, ON or OFF, of the DFMI Heater. SC_X_POS_WRT_SUN This element provides the x,y,z SC_Y_POS_WRT_SUN position of the spacecraft SC_Z_POS_WRT_SUN: measured with respect to the sun, expressed in J2000 Earth Mean Equator and Vernal Equinox coordinates corrected for light time and stellar aberration. SC_X_VEL_WRT_SUN This element provides the x,y,z SC_Y_VEL_WRT_SUN velocity of the spacecraft SC_Z_VEL_WRT_SUN: measured with respect to the sun, expressed in J2000 Earth Mean Equator and Vernal Equinox coordinates corrected for light time and stellar aberration. SC_X_POS_WRT_WILD2 This element provides the x,y,z SC_Y_POS_WRT_WILD2 position of the spacecraft SC_Z_POS_WRT_WILD2: measured with respect to Wild 2, expressed in J2000 Earth Mean Equator and Vernal Equinox coordinates corrected for light time and stellar aberration. SC_X_VEL_WRT_WILD2 This element provides the x,y,z SC_Y_VEL_WRT_WILD2 velocity of the spacecraft SC_Z_VEL_WRT_WILD2: measured with respect to Wild 2, expressed in J2000 Earth Mean Equator and Vernal Equinox coordinates corrected for light time and stellar aberration. SC_X_POS_WRT_EARTH This element provides the x,y,z SC_Y_POS_WRT_EARTH position of the spacecraft SC_Z_POS_WRT_EARTH: measured with respect to Earth, expressed in J2000 Earth Mean Equator and Vernal Equinox coordinates corrected for light time and stellar aberration. SC_X_VEL_WRT_EARTH This element provides the x,y,z SC_Y_VEL_WRT_EARTH velocity of the spacecraft SC_Z_VEL_WRT_EARTH: measured with respect to Earth, expressed in J2000 Earth Mean Equator and Vernal Equinox coordinates corrected for light time and stellar aberration. DFMI_VELSUN_ANGLE: This is the angular separation between the DFMI Sensor Unit Normal and the velocity vector of the spacecraft which is measured with respect to the sun. DFMI_VELWILD2_ANGLE: This is the angular separation between the DFMI Sensor Unit Normal and the velocity vector of the spacecraft which is measured with respect to the comet Wild 2. DFMI_VELEARTH_ANGLE: This is the angular separation between the DFMI Sensor Unit Normal and the velocity vector of the spacecraft which is measured with respect to the Earth. DFMI_VELISP_ANGLE: This is the angular separation between the DFMI Sensor Unit Normal and the velocity vector of the spacecraft which is measured with respect to the Interstellar Contact Information: : For any questions regarding the data format of the archive, contact: Howard Taylor Applied Coherent Technology Corp 112 Elden Street, Suite K Herndon, VA 20170 (818) 354-5401 taylor@actgate.com
DATA_SET_RELEASE_DATE 2000-05-05T00:00:00.000Z
START_TIME 1999-02-19T04:51:35.891Z
STOP_TIME 1999-09-13T05:52:33.278Z
MISSION_NAME STARDUST
MISSION_START_DATE 1999-02-07T12:00:00.000Z
MISSION_STOP_DATE 2006-01-16T12:00:00.000Z
TARGET_NAME 81P/WILD 2 (1978 A2)
TARGET_TYPE COMET
INSTRUMENT_HOST_ID SDU
INSTRUMENT_NAME DUST FLUX MONITOR INSTRUMENT
INSTRUMENT_ID DFMI
INSTRUMENT_TYPE DUST IMPACT DETECTOR
NODE_NAME Small Bodies
ARCHIVE_STATUS SAFED
CONFIDENCE_LEVEL_NOTE The data collected here has been prepared with the highest concern for the perfectness of the data delivered. During the processing of the data in preparation for delivery with this volume, the structure of each data packet was verified. This verification included detection of both the sync word and the length of each packet. The data that was used to produce this archive was generated on-board the spacecraft and telemetered to the NASA/JPL Deep Space Network (DSN) and decommutated by Applied Coherent Technology Corp for the Jet Propulsion Laboratory. Some of the data was selectively excluded from this archive by the principal investigator for DFMI. These data were selectively excluded because the instrument was operating in a faulty manner, not even producing a proper sync byte. The data that is included on this archive passes the data verification scheme mentioned above.
CITATION_DESCRIPTION TBD
ABSTRACT_TEXT Data collected by the Dust Flux Monitor Instrument (DFMI) of the Stardust satellite, taken during the early cruise phase of the mission. These data were determined by peer review to be of no scientific use.
PRODUCER_FULL_NAME APPLIED COHERENT TECHNOLOGY CORPORATION
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