Cassini MAG Vector Helium Magnetic-Field Data at the Science Rate 2002-09-13

urn:nasa:pds:cassini-mag-raw:data-sci-vhm-scirate:02256_mrdcd_sdvhmc 1.0 Cassini MAG Vector Helium Magnetic-Field Data at the Science Rate 2002-09-13 1.20.0.0 Product_Observational Dougherty, Michele K.; Kellock, Stephen; Slootweg, A. Peter; Achilleos, Nicholas 2023 02256_MRDCD_SDVHMC.FFD contains Cassini vector helium magnetometer (VHM) science data, at the full science rate, collected between 2002-09-13T00:01 and 2002-09-14T00:02. 2023-12-04 1.0 Original 02256_MRDCD_SDVHMC.FFD, product version 2, from the PDS3 CO-E/SW/J/S-MAG-2-REDR-RAW-DATA-V2.0 dataset, DATA directory, converted to PDS4. Native Stop Time/instrument_clock_stop = 1410654034.512 2002-09-13T00:01:14.573Z 2002-09-14T00:02:38.590Z Science Raw Magnetosphere Fields Magnetic Background Cassini-Huygens Mission urn:nasa:pds:context:investigation:mission.cassini-huygens data_to_investigation Cassini Orbiter Host urn:nasa:pds:context:instrument_host:spacecraft.co is_instrument_host Dual Technique Magnetometer Instrument urn:nasa:pds:context:instrument:mag.co is_instrument Solar Wind Plasma Stream urn:nasa:pds:context:target:plasma_stream.solar_wind data_to_target Science Cruise 1410567549:225 1410654034:131 1 1410567549.881 urn:nasa:pds:cassini-mag-raw:document:data-sci-vhm-scirate-desc data_to_document Document containing a description of the Cassini MAG Vector Helium Data at the Science Rate Collection. CO-E/SW/J/S-MAG-2-REDR-RAW-DATA-V2.0:02256_MRDCD_SDVHMC:02256_MRDCD_SDVHMC.FFD data_to_raw_source_product 10.17189/1519599 PDS Planetary Plasma Interactions Node This is the first version converted to PDS4. The DOI provided references the PDS3 source data set. 02256_MRDCD_SDVHMC.FFD 2015-12-03T12:36:12.000Z 75460 d13fb80862725c07dc2402bd6f98cfcc ABSTRACT MISSING DATA FLAG = 1.00000E+34 AVERAGE INTERVAL = 00:00:27.990 ######### CASSINI ABSTRACT ######### INPUT FILE: 02256_mrdcd FLAT FILE MAKER: caspre2ff v1.7 SUN COMPILATION DATE : 02/08/12-13:04:45 wTime0 and MCI determine dt between vectors except for channel data Use Configuration File : T --- Use IFC Table : T Configuration File : 02256_mrdcd_HKCONN IFC File : 02256_mrdcd_fhk.ifc User defined wtime0 : F --- User defined MCI : F Default wTime0 : 125.00000 Default MCI : 62.47700 Time for channel data is extracted from the Tertiary data SCET (Jan 1, 1958 00:00:00) 2002 256 SEP 13 00:00:42.816 1410566442.816 SCLK (Jan 1, 1958 00:00:00) 2002 256 SEP 13 00:18:38.129 1410567518.129 Flatfile times are SCLK based t0 = Jan 1 1958 00:00:00 TIMEOFFSET 0.000000 SCLKDIFFFLAT 0.000000 CASSINI SCLK (1958)= FLATFILE (1966)+ SCLKDIFFFLAT FIRST/LAST TIMEs are SCLK conversions to a UT-like format using the approximation of 1 sclk tick equals 1 second ######### PROGRAM : casupdate INPUT FILE : /data1/tlm/prep/02256/mrdcd/02256_mrdcd_SDVHMC INPUT TABLE : /data1/tlm/prep/02256/scdcd/02256_ecdcd_fch.scas COLUMN ID : 5. BYTE 0 BIT 1 TYPE 4 : SCAS FLAT FILE MAKER: casupdate v1.5 SUN ######### PROGRAM : casupdate INPUT FILE : /data1/tlm/prep/02256/mrdcd/02256_mrdcd_SDVHMC INPUT TABLE : /data1/tlm/prep/02256/mrdcd/02256_mrdcd_fhk.dig COLUMN ID : 6. BYTE 1 BIT -99 TYPE 2 : VHM FLAT FILE MAKER: casupdate v1.5 SUN 0 2695 02256_MRDCD_SDVHMC is an IGPP Flatfile which consists of two files: a data file (.FFD) and a header file (.FFH). The data file is a binary, fixed record length file, and the header is an ASCII file. All of the Cassini MAG flatfiles represent time as a spacecraft clock value, referenced to 1958, with the minor frame converted from units of 1/256 sec to units of milliseconds. This label provides a mapping between the internal time representation (NATIVE_START_TIME), true spacecraft clock (SPACECRAFT_CLOCK_START_COUNT) and spacecraft event time in UTC (START_TIME). See the collection description file (data-sci-vhm-scirate-desc.txt) and the MAG volume SIS (VOLSIS.PDF) for additional information on the MAG time tag. The VHM data file contains the following columns: Name Units Description ================================================================= SCLK(1958) Counts Time (sclk NOT UTC) is represented as decimal seconds relative to the epoch Jan 1 1958 00:00:00.000. BX,BY,BZ(3) ENG Magnetic field component along the vector helium sensor X-axis, Y-axis, and Z-axis respectively. Data are in engineering units. MAG Status N/A Array of bits containing status information related to active MAG magnetometer modes, packet type, etc. VHM Status N/A Array of bits containing status information for the VHM instrument. ================================================================= 6 0 28 SCLK(1958) 1 1 IEEE754MSBDouble 8 Counts Time (SCLK NOT UTC) is represented as a decimal SCLK count relative to the epoch Jan 1 1958 00:00:00.000. X_VHM 2 9 IEEE754MSBSingle 4 Engineering Units Magnetic field component along the vector helium sensor X-axis in engineering units. Magnetic-field units (VHM) The units of the preprocessed VHM magnetic-field data are given in engineering units (ENG). They represent the X, Y, and Z VHM sensor counts at the given time. These counts were converted into ENG from data numbers (DN) by using the following: ENG = (DN - 8192) / 8192 * factor. The value of the factor is determined from the range given with each vector using the following table: Range Factor 0 32 1 256 1.0E+34 Y_VHM 3 13 IEEE754MSBSingle 4 Engineering Units Magnetic field component along the vector helium sensor Y-axis in engineering units. 1.0E+34 Z_VHM 4 17 IEEE754MSBSingle 4 Engineering Units Magnetic field component along the vector helium sensor Z-axis in engineering units. 1.0E+34 MAGSTATUS 5 21 UnsignedMSB4 4 The MAGStatus data are an array of bits that describe the status of the MAG equipment, as set out in the following table. FIELD SIZE NAME BYTE BIT PacketType 1 Housekeeping/Science-data flag 0 7 MSB SCAS 1 SCAS status 0 6 AverageType 1 Average Type (fixed/running) 0 5 SHMFlag 1 SHM Flag 0 4 VHMFlag 1 VHM Flag 0 3 FGMFlag 1 FGM Flag 0 2 ADCFlag 1 ADC Flag 0 1 MCI 9 Measurement Cycle Interrupt 0-1 0,7-0 LSB,MSB Average 5 TimeCode Missing 2 2 sparebits 2 spare two bits 2 1-0 BIU Discretes 3-4 8 PROM 1 PROM program 3 7 MSB ConfigEnable 1 Config-Enable 3 6 PSU_2 1 PSU 2 3 5 PSU_1 1 PSU 1 3 4 Processor_B 1 Processor B 3 3 Processor_A 1 Processor A 3 2 SleepMode 1 Sleep Mode 3 1 Reset 1 Reset 3 0 LSB VHMSTATUS 6 25 UnsignedMSB4 4 The VHMStatus data are an array of bits that describe the status of the VHM, as set out in the following table. FIELD SIZE NAME BYTE BIT rg 1 Range (debugging only) 0 7 MSB TimeStatus 4 time quality status 0 6-3 sparebits 2 spare bits 0 2-0 LSB Digital 8 Digital Status word 1 7-0 CalibId 8 Calibration Id 2 7-0 CoordId 8 Field Angle data 3 7-0 02256_MRDCD_SDVHMC.FFH 1969-12-31T16:00:00 4176 58 ab6b4827fa5ddfcac115e1fcd619574f This file is a UCLA flatfile header for the accompanying data file.

0 72 7-Bit ASCII Text 02256_MRDCD_SDVHMC.FFH is a UCLA flatfile header containing formatting information for the accompanying data file (02256_MRDCD_SDVHMC.FFD). This header is used to read the data file by a variety of software packages developed at UCLA. Other users of the data may ignore this file.