urn:nasa:pds:mess_mascs:data_cdr:ufc_eac_00_05163_130015_hdr 1.0 1.11.0.0 Product_Observational 2019-10-02 1.0 This label was modified to convert to PDS4. 2005-06-12T13:00:16Z 2005-06-12T14:00:40Z Science Calibrated Ultraviolet Atmosphere Atmospheres Structure MESSENGER Mission urn:nasa:pds:context:investigation:mission.messenger data_to_investigation MESS MASCS Instrument urn:nasa:pds:context:instrument:instrument.mascs__mess is_instrument MESSENGER Spacecraft urn:nasa:pds:context:instrument_host:spacecraft.mess is_instrument_host CALIBRATION Calibrator urn:nasa:pds:context:target:calibrator.calibration data_to_target Earth Cruise 1/027068359.600 1/027071983.658 UVVSCFUVHDR PIPE-MASCS2CDR 9.3 urn:nasa:pds:mess_mascs:document:uvvs_cdr_ds.cat data_to_document data set catalog file urn:nasa:pds:mess_mascs:document:uvvshdrc.fmt data_to_document format file containing column information ufc_eac_00_05163_130015_hdr.dat ufc_eac_00_05163_130015_hdr_file 3700 74 ufc_eac_00_05163_130015_hdr_table_binary 0 74 This table contains instrument engineering data collected by the FUV detector. Detailed descriptions for the parameters defined below are contained in the CDR SIS document. The complete column definitions are contained in an external file found in the LABEL directory of the archive volume. 23 0 50 SEQ_COUNTER 1 1 UnsignedMSB2 2 CCSDS packet sequence counter. PER OBSERVATION column. SC_TIME 2 3 UnsignedMSB4 4 Spacecraft time in integer seconds that is transmitted to the MESSENGER subsystems by the Integrated Electronics Module. This is assigned as the start time of the UVVS observation. A UVVS observation is defined as all the scan data contained within one UVVS science packet. This is due to the highly configurable nature of the instrument, i.e. it can be commanded to take multiple scans over multiple wavelengths. Unit is in mission elapsed time which is the number of seconds since launch. PER OBSERVATION column. PACKET_SUBSECONDS 3 7 UnsignedMSB2 2 The subsecond time in milliseconds that the telemetry packet was initiated. SC_TIME plus PACKET_SUBSECONDS is the spacecraft time of the first integration. Values of this field are in units of 5 milliseconds. For example, a value of 10 refers to a time of 50 milliseconds. PER OBSERVATION column. START_POS 4 9 UnsignedMSB2 2 Start position where grating drive begins a scan. Grating drive step position corresponds to a given wavelength being observed by an instrument. PER OBSERVATION column. STEP_COUNT 5 11 UnsignedMSB2 2 Number of steps the grating drive will take in a scan. This directly corresponds to the range of wavelengths that will be observed in one UVVS observation. PER OBSERVATION column. INT_TIME 6 13 UnsignedMSB2 2 Integration time in grating drive loop control interrupt periods (nominally 3000 Hz). For example, the actual integration time in seconds is INT_TIME/3000. PER OBSERVATION column. STEP_TIME 7 15 UnsignedMSB2 2 Step time in grating drive loop control interrupt periods (nominally 3000 Hz). For example, the actual step time in seconds is STEP_TIME/3000. PER OBSERVATION column. PHASE_OFFSET 8 17 UnsignedMSB2 2 Phase offset in grating drive loop control interrupt periods. Phase offset between the beginning of grating drive step and the start of a PMT integration in units of 0.3 milliseconds. Default value is 0 (no phase offset). By setting the phase offset to a non-zero value (reserved for contingency operations), the user will tell the software to initiate a step before the end of an integration, accounting for latencies in the motor controller. PER OBSERVATION column. SCAN_CYCLES 9 19 UnsignedMSB2 2 Number of times to repeat scan. PER OBSERVATION column. ZIGZAG 10 21 UnsignedMSB2 2 Indicates whether grating drive moves in a \\triangle\\ (stepping up, then stepping down), or \\sawtooth\\ (stepping up, then \\flying\\ down) motion. A \\triangle\\ observation takes one grating scan stepping up the grating, then reverses direction and takes the next grating scan stepping back down the grating. Scans in opposite directions are offset from one another by two grating step positions such that the wavelength ranges are slightly different. A \\sawtooth\\ observation takes one grating scan stepping up the grating, then \\flies\\ the grating back to the START_POSITION to take the next observation. =0 disable, =1 enable. PER OBSERVATION column. COMPRESSION 11 23 UnsignedMSB2 2 SLIT_MASK_POS 12 25 UnsignedMSB2 2 Indicates whether slit mask is in atmospheric (open) or surface (closed) position. Atmospheric slit results in a 1 deg. by 0.04 deg. instantaneous field of view (iFOV). Surface slit results in a 0.05 deg. by 0.04 deg. iFOV. =0 closed, =1 open. PER OBSERVATION column. FUV_ON 13 27 UnsignedMSB2 2 Indicates whether FUV PMT power is on. A more complete description of this field can be found in the MASCS User\\s Guide (Applicable Document 6 in UVVS_CDR_DDR_SIS.PDF). =0 off, =1 on. PER OBSERVATION column. MUV_ON 14 29 UnsignedMSB2 2 Indicates whether MUV PMT power is on. A more complete description of this field can be found in the MASCS User\\s Guide (Applicable Document 6 in UVVS_CDR_DDR_SIS.PDF). =0 off, =1 on. PER OBSERVATION column. VIS_ON 15 31 UnsignedMSB2 2 Indicates whether VIS PMT power is on. A more complete description of this field can be found in the MASCS User\\s Guide (Applicable Document 6 in UVVS_CDR_DDR_SIS.PDF). =0 off, =1 on. PER OBSERVATION column. BUFFER_OVERFLOW 16 33 UnsignedMSB2 2 Indicates whether scan programmed overflowed data buffer and was therefore truncated. =0 false, =1 true. PER OBSERVATION column. SPARE_BITS 17 35 UnsignedMSB2 2 A two-byte spare location. GD_SETTLE_CTR 18 37 UnsignedMSB2 2 Number of times during integration that the grating drive wandered outside target range. This can happen very rarely with an encoder misread, or motor misstep, and would result in an offset of step-number to wavelength correlations for subsequent observations in a given scan. PER OBSERVATION column. NUM_SCAN_VALUES 19 39 UnsignedMSB2 2 Total number of values or data points in the entire scan observation. Used to determine the number of valid data points in the SCAN_DATA column. Maximum value is 3626. PER OBSERVATION column. STEP_SIZE 20 41 UnsignedMSB2 2 Step size in arcmin units. PER OBSERVATION column. PAD_BYTE 21 43 UnsignedMSB2 2 A two-byte spare location. PER OBSERVATION column. COADD 22 45 UnsignedMSB2 2 Number of steps coadded to make a single observation. Default = 1, i.e. one step per observation. PER OBSERVATION column. CALIBRATION_SOFTWARE_VERSION 23 47 IEEE754MSBSingle 4 Indicates version of calibration software used. Increments with reprocessing of CDRs. PER OBSERVATION column. ufc_eac_00_05163_130015_hdr.lbl ufc_eac_00_05163_130015_hdr_pds3file 1981 ufc_eac_00_05163_130015_hdr_pds3file_stream 0 2269 7-Bit ASCII Text Carriage-Return Line-Feed