! Skeleton table for the "twins1_hk_1sec_00000000_v01.cdf" CDF. ! Generated: Monday, 20-Jul-2026 09:48:26 ! CDF created/modified by CDF V3.9.1 ! Skeleton table created by CDF V3.8.1_0 #header CDF NAME: twins1_hk_1sec_00000000_v01.cdf DATA ENCODING: NETWORK MAJORITY: ROW FORMAT: SINGLE ! Variables G.Attributes V.Attributes Records Dims Sizes ! --------- ------------ ------------ ------- ---- ----- 0/10 20 16 0/z 0 ! CDF_COMPRESSION: None ! (Valid compression: None, GZIP.1-9, RLE.0, HUFF.0, AHUFF.0) ! CDF_CHECKSUM: None ! (Valid checksum: None, MD5) ! CDF_LEAPSECONDLASTUPDATED: 20150701 #GLOBALattributes ! Attribute Entry Data ! Name Number Type Value ! --------- ------ ---- ----- "Project" 1: CDF_CHAR { "TWINS>Two Wide-angle " - "Imaging Neutral-atom " - "Spectrometers" } . "Source_name" 1: CDF_CHAR { "TWINS1>Two Wide-angle " - "Imaging Neutral-atom " - "Spectrometers" } . "Discipline" 1: CDF_CHAR { "Space " - "Physics>Magnetospheric " - "Science" } . "Data_type" 1: CDF_CHAR { "hk>housekeeping" } . "Descriptor" 1: CDF_CHAR { "1sec>1 sec" } . "Data_version" 1: CDF_CHAR { "1" } . "PI_name" 1: CDF_CHAR { "D. McComas & H. Fahr" } . "PI_affiliation" 1: CDF_CHAR { "SwRI & U. Bonn, " - "respectively." } . "TEXT" 1: CDF_CHAR { "TWINS (Two Wide-angle " - "Imaging Neutral-atom " - "Spectrometers) is a " - "Mission of Opportunity " - "under NASA's Small " - "Explorer (SMEX) program. " - "TWINS-1 and TWINS-2 are " - "the designations for " - "NASA-sponsored instruments" - " flying on unspecified " - "non-NASA U.S. government " - "spacecraft." } 2: CDF_CHAR { "The TWINS-1 instrument " - "high voltages were turned " - "on in April 2007 and the " - "TWINS-2 high voltages in " - "May 2008; the exact " - "launchdates are not " - "available. The data " - "(including both science " - "data and spacecraft " - "ephemeris/attitude " - "information) from the two " - "NASA-funded science " - "instruments are publicly " - "available to the " - "scientific research " - "community. See " - "http://twins.swri.edu/" } 3: CDF_CHAR { "TWINS is a stereo mission " - "whose overall scientific " - "objective is to establish " - "the global connectivities " - "and causal relationships " - "between processes in " - "different regions of the " - "Earth.s magnetosphere. To " - "meet this goal, TWINS-1 " - "and TWINS-2 provide " - "stereoscopic neutral atom " - "imaging of the " - "magnetosphere from two " - "widely spaced, " - "high-altitude, " - "high-inclination " - "spacecraft. TWINS " - "instrumentation includes " - "an energetic neutral atom " - "(ENA) imager to capture " - "charge-exchange-produced " - "neutral atoms over a broad" - " energy range " - "(approximately 1-100 keV) " - "and a Lyman-alpha detector" - " to measure the density of" - " the neutral hydrogen " - "geocorona needed for " - "extraction of " - "magnetospheric ion fluxes " - "from neutral atom data." } 4: CDF_CHAR { "The TWINS-1 and TWINS-2 " - "instruments are identical." - " Each spacecraft carrying " - "TWINS instruments is in a " - "Molniya orbit (63.4 deg, " - "7.2 Re apogee, 1000 km " - "perigee; period 12 h), and" - " is three-axis stabilized " - "and approximately " - "nadir-pointing. Each " - "acquires image data with " - "time resolution of 60 s. " - "The time required to " - "change actuator direction " - "between scans (no data " - "collection) was 25 seconds" - " from June 2008 to July " - "2009, and 12 seconds at " - "all other times. This " - "gives an effective cadence" - " of 72 or 85 seconds. The" - " nominal design lifetime " - "for each instrument is " - "four years. TWINS operates" - " only during the apogee " - "portion of each orbit, " - "when the spacecraft is " - "above the radiation belts." } 5: CDF_CHAR { "More detailed information " - "is available at the TWINS " - "home page " - "http://twins.swri.edu/" } . "Instrument_type" 1: CDF_CHAR { "Imaging and Remote Sensing" - " (Magnetosphere/Earth)" } . "Mission_group" 1: CDF_CHAR { "TWINS" } . "Logical_source" 1: CDF_CHAR { "twins1_hk_1sec" } . "Logical_file_id" 1: CDF_CHAR { "twins1_hk_1sec_00000000_v01" } . "Logical_source_description" 1: CDF_CHAR { "TWINS Spacecraft 1 - " - "housekeeping" } . "File_naming_convention" 1: CDF_CHAR { "source_datatype_descriptor" } . "Link_text" 1: CDF_CHAR { "Initial CDAWeb TWINS " } 2: CDF_CHAR { "Release notes and other " - "information available at" } . "Link_title" 1: CDF_CHAR { "list of events and sample " - "plots." } 2: CDF_CHAR { "the TWINS Southwest " - "Research Institute web " - "site" } . "HTTP_link" 1: CDF_CHAR { "https://cdaweb.gsfc.nasa.g" - "ov/TWINS_info.html" } 2: CDF_CHAR { "https://science.nasa.gov/m" - "ission/twins" } . "spase_DatasetResourceID" 1: CDF_CHAR { " " } . "DOI" 1: CDF_CHAR { " " } . #VARIABLEattributes "CATDESC" "DEPEND_0" "DISPLAY_TYPE" "FIELDNAM" "FILLVAL" "FORMAT" "LABLAXIS" "LABL_PTR_1" "UNITS" "VALIDMIN" "VALIDMAX" "VAR_TYPE" "VAR_NOTES" "VIRTUAL" "FUNCT" "COMPONENT_0" #variables ! No rVariables. #zVariables ! Variable Data Number Record Dimension ! Name Type Elements Dims Sizes Variance Variances ! -------- ---- -------- ---- ----- -------- --------- "Epoch" CDF_EPOCH 1 0 T ! VAR_COMPRESSION: None ! (Valid compression: None, GZIP.1-9, RLE.0, HUFF.0, AHUFF.0) ! VAR_SPARSERECORDS: None ! (Valid sparserecords: None, sRecords.PAD, sRecords.PREV) ! VAR_PADVALUE: 01-Jan-0000 00:00:00.000 ! Attribute Data ! Name Type Value ! -------- ---- ----- "CATDESC" CDF_CHAR { "Epoch" } "DISPLAY_TYPE" CDF_CHAR { "time_series" } "FIELDNAM" CDF_CHAR { "Epoch" } "FILLVAL" CDF_EPOCH { 31-Dec-9999 23:59:59.999 } "FORMAT" CDF_CHAR { "F12.2" } "LABLAXIS" CDF_CHAR { "Epoch" } "VALIDMIN" CDF_EPOCH { 01-Jan-0000 00:00:00.000 } "VALIDMAX" CDF_EPOCH { 01-Jan-9999 00:00:00.000 } "VAR_TYPE" CDF_CHAR { "support_data" } . ! RV values were not requested. ! Variable Data Number Record Dimension ! Name Type Elements Dims Sizes Variance Variances ! -------- ---- -------- ---- ----- -------- --------- "timemjd" CDF_DOUBLE 1 0 T ! VAR_COMPRESSION: None ! (Valid compression: None, GZIP.1-9, RLE.0, HUFF.0, AHUFF.0) ! VAR_SPARSERECORDS: None ! (Valid sparserecords: None, sRecords.PAD, sRecords.PREV) ! VAR_PADVALUE: -1.0e+30 ! Attribute Data ! Name Type Value ! -------- ---- ----- "CATDESC" CDF_CHAR { "timestamps of the LAD data in Modified" - " Julian Date" } "DEPEND_0" CDF_CHAR { "Epoch" } "DISPLAY_TYPE" CDF_CHAR { "time_series" } "FIELDNAM" CDF_CHAR { "MJD Timestamp" } "FILLVAL" CDF_DOUBLE { -1.0e+31 } "FORMAT" CDF_CHAR { "F12.5" } "LABLAXIS" CDF_CHAR { "Time MJD" } "UNITS" CDF_CHAR { "MJD" } "VALIDMIN" CDF_DOUBLE { 51545.00000 } "VALIDMAX" CDF_DOUBLE { 88070.00000 } "VAR_TYPE" CDF_CHAR { "support_data" } . ! RV values were not requested. ! Variable Data Number Record Dimension ! Name Type Elements Dims Sizes Variance Variances ! -------- ---- -------- ---- ----- -------- --------- "TWASPEEDSELECTION" CDF_DOUBLE 1 0 T ! VAR_COMPRESSION: None ! (Valid compression: None, GZIP.1-9, RLE.0, HUFF.0, AHUFF.0) ! VAR_SPARSERECORDS: None ! (Valid sparserecords: None, sRecords.PAD, sRecords.PREV) ! VAR_PADVALUE: -1.0e+30 ! Attribute Data ! Name Type Value ! -------- ---- ----- "CATDESC" CDF_CHAR { "TWASPEEDSELECTION" } "DEPEND_0" CDF_CHAR { "Epoch" } "DISPLAY_TYPE" CDF_CHAR { "time_series" } "FIELDNAM" CDF_CHAR { "TWASPEEDSELECTION" } "FILLVAL" CDF_DOUBLE { -1.0e+31 } "FORMAT" CDF_CHAR { "F5.1" } "LABLAXIS" CDF_CHAR { "TWASPEEDSELECTION" } "UNITS" CDF_CHAR { " " } "VALIDMIN" CDF_DOUBLE { 0.0 } "VALIDMAX" CDF_DOUBLE { 100.0 } "VAR_TYPE" CDF_CHAR { "data" } . ! RV values were not requested. ! Variable Data Number Record Dimension ! Name Type Elements Dims Sizes Variance Variances ! -------- ---- -------- ---- ----- -------- --------- "FEEHV1P4KVMONITOR_VOLT" CDF_DOUBLE 1 0 T ! VAR_COMPRESSION: None ! (Valid compression: None, GZIP.1-9, RLE.0, HUFF.0, AHUFF.0) ! VAR_SPARSERECORDS: None ! (Valid sparserecords: None, sRecords.PAD, sRecords.PREV) ! VAR_PADVALUE: -1.0e+30 ! Attribute Data ! Name Type Value ! -------- ---- ----- "CATDESC" CDF_CHAR { "FEEHV1P4KVMONITOR_VOLT" } "DEPEND_0" CDF_CHAR { "Epoch" } "DISPLAY_TYPE" CDF_CHAR { "time_series" } "FIELDNAM" CDF_CHAR { "FEEHV1P4KVMONITOR_VOLT" } "FILLVAL" CDF_DOUBLE { -1.0e+31 } "FORMAT" CDF_CHAR { "f12.5" } "LABLAXIS" CDF_CHAR { "FEEHV1P4KVMONITOR_VOLT" } "UNITS" CDF_CHAR { "volt" } "VALIDMIN" CDF_DOUBLE { 0.00000 } "VALIDMAX" CDF_DOUBLE { 1000000.00000 } "VAR_TYPE" CDF_CHAR { "data" } . ! RV values were not requested. ! Variable Data Number Record Dimension ! Name Type Elements Dims Sizes Variance Variances ! -------- ---- -------- ---- ----- -------- --------- "FEEHV1P1KVMONITOR_VOLT" CDF_DOUBLE 1 0 T ! VAR_COMPRESSION: None ! (Valid compression: None, GZIP.1-9, RLE.0, HUFF.0, AHUFF.0) ! VAR_SPARSERECORDS: None ! (Valid sparserecords: None, sRecords.PAD, sRecords.PREV) ! VAR_PADVALUE: -1.0e+30 ! Attribute Data ! Name Type Value ! -------- ---- ----- "CATDESC" CDF_CHAR { "FEEHV1P1KVMONITOR_VOLT" } "DEPEND_0" CDF_CHAR { "Epoch" } "DISPLAY_TYPE" CDF_CHAR { "time_series" } "FIELDNAM" CDF_CHAR { "FEEHV1P1KVMONITOR_VOLT" } "FILLVAL" CDF_DOUBLE { -1.0e+31 } "FORMAT" CDF_CHAR { "f12.5" } "LABLAXIS" CDF_CHAR { "FEEHV1P1KVMONITOR_VOLT" } "UNITS" CDF_CHAR { "volt" } "VALIDMIN" CDF_DOUBLE { 0.00000 } "VALIDMAX" CDF_DOUBLE { 1000000.00000 } "VAR_TYPE" CDF_CHAR { "data" } . ! RV values were not requested. ! Variable Data Number Record Dimension ! Name Type Elements Dims Sizes Variance Variances ! -------- ---- -------- ---- ----- -------- --------- "FEEHV1P10KVMONITOR_VOLT" CDF_DOUBLE 1 0 T ! VAR_COMPRESSION: None ! (Valid compression: None, GZIP.1-9, RLE.0, HUFF.0, AHUFF.0) ! VAR_SPARSERECORDS: None ! (Valid sparserecords: None, sRecords.PAD, sRecords.PREV) ! VAR_PADVALUE: -1.0e+30 ! Attribute Data ! Name Type Value ! -------- ---- ----- "CATDESC" CDF_CHAR { "FEEHV1P10KVMONITOR_VOLT" } "DEPEND_0" CDF_CHAR { "Epoch" } "DISPLAY_TYPE" CDF_CHAR { "time_series" } "FIELDNAM" CDF_CHAR { "FEEHV1P10KVMONITOR_VOLT" } "FILLVAL" CDF_DOUBLE { -1.0e+31 } "FORMAT" CDF_CHAR { "f12.5" } "LABLAXIS" CDF_CHAR { "FEEHV1P10KVMONITOR_VOLT" } "UNITS" CDF_CHAR { "volt" } "VALIDMIN" CDF_DOUBLE { 0.00000 } "VALIDMAX" CDF_DOUBLE { 1000000.00000 } "VAR_TYPE" CDF_CHAR { "data" } . ! RV values were not requested. ! Variable Data Number Record Dimension ! Name Type Elements Dims Sizes Variance Variances ! -------- ---- -------- ---- ----- -------- --------- "FEEHV2P4KVMONITOR_VOLT" CDF_DOUBLE 1 0 T ! VAR_COMPRESSION: None ! (Valid compression: None, GZIP.1-9, RLE.0, HUFF.0, AHUFF.0) ! VAR_SPARSERECORDS: None ! (Valid sparserecords: None, sRecords.PAD, sRecords.PREV) ! VAR_PADVALUE: -1.0e+30 ! Attribute Data ! Name Type Value ! -------- ---- ----- "CATDESC" CDF_CHAR { "FEEHV2P4KVMONITOR_VOLT" } "DEPEND_0" CDF_CHAR { "Epoch" } "DISPLAY_TYPE" CDF_CHAR { "time_series" } "FIELDNAM" CDF_CHAR { "FEEHV2P4KVMONITOR_VOLT" } "FILLVAL" CDF_DOUBLE { -1.0e+31 } "FORMAT" CDF_CHAR { "f12.5" } "LABLAXIS" CDF_CHAR { "FEEHV2P4KVMONITOR_VOLT" } "UNITS" CDF_CHAR { "volt" } "VALIDMIN" CDF_DOUBLE { 0.00000 } "VALIDMAX" CDF_DOUBLE { 1000000.00000 } "VAR_TYPE" CDF_CHAR { "data" } . ! RV values were not requested. ! Variable Data Number Record Dimension ! Name Type Elements Dims Sizes Variance Variances ! -------- ---- -------- ---- ----- -------- --------- "FEEHV2P1KVMONITOR_VOLT" CDF_DOUBLE 1 0 T ! VAR_COMPRESSION: None ! (Valid compression: None, GZIP.1-9, RLE.0, HUFF.0, AHUFF.0) ! VAR_SPARSERECORDS: None ! (Valid sparserecords: None, sRecords.PAD, sRecords.PREV) ! VAR_PADVALUE: -1.0e+30 ! Attribute Data ! Name Type Value ! -------- ---- ----- "CATDESC" CDF_CHAR { "FEEHV2P1KVMONITOR_VOLT" } "DEPEND_0" CDF_CHAR { "Epoch" } "DISPLAY_TYPE" CDF_CHAR { "time_series" } "FIELDNAM" CDF_CHAR { "FEEHV2P1KVMONITOR_VOLT" } "FILLVAL" CDF_DOUBLE { -1.0e+31 } "FORMAT" CDF_CHAR { "f12.5" } "LABLAXIS" CDF_CHAR { "FEEHV2P1KVMONITOR_VOLT" } "UNITS" CDF_CHAR { "volt" } "VALIDMIN" CDF_DOUBLE { 0.00000 } "VALIDMAX" CDF_DOUBLE { 1000000.00000 } "VAR_TYPE" CDF_CHAR { "data" } . ! RV values were not requested. ! Variable Data Number Record Dimension ! Name Type Elements Dims Sizes Variance Variances ! -------- ---- -------- ---- ----- -------- --------- "FEEHV2P10KVMONITOR_VOLT" CDF_DOUBLE 1 0 T ! VAR_COMPRESSION: None ! (Valid compression: None, GZIP.1-9, RLE.0, HUFF.0, AHUFF.0) ! VAR_SPARSERECORDS: None ! (Valid sparserecords: None, sRecords.PAD, sRecords.PREV) ! VAR_PADVALUE: -1.0e+30 ! Attribute Data ! Name Type Value ! -------- ---- ----- "CATDESC" CDF_CHAR { "FEEHV2P10KVMONITOR_VOLT" } "DEPEND_0" CDF_CHAR { "Epoch" } "DISPLAY_TYPE" CDF_CHAR { "time_series" } "FIELDNAM" CDF_CHAR { "FEEHV2P10KVMONITOR_VOLT" } "FILLVAL" CDF_DOUBLE { -1.0e+31 } "FORMAT" CDF_CHAR { "f12.5" } "LABLAXIS" CDF_CHAR { "FEEHV2P10KVMONITOR_VOLT" } "UNITS" CDF_CHAR { "volt" } "VALIDMIN" CDF_DOUBLE { 0.00000 } "VALIDMAX" CDF_DOUBLE { 1000000.00000 } "VAR_TYPE" CDF_CHAR { "data" } . ! RV values were not requested. ! Variable Data Number Record Dimension ! Name Type Elements Dims Sizes Variance Variances ! -------- ---- -------- ---- ----- -------- --------- "TWAPOSITIONMONITOR" CDF_DOUBLE 1 0 T ! VAR_COMPRESSION: None ! (Valid compression: None, GZIP.1-9, RLE.0, HUFF.0, AHUFF.0) ! VAR_SPARSERECORDS: None ! (Valid sparserecords: None, sRecords.PAD, sRecords.PREV) ! VAR_PADVALUE: -1.0e+30 ! Attribute Data ! Name Type Value ! -------- ---- ----- "CATDESC" CDF_CHAR { "TWAPOSITIONMONITOR" } "DEPEND_0" CDF_CHAR { "Epoch" } "DISPLAY_TYPE" CDF_CHAR { "time_series" } "FIELDNAM" CDF_CHAR { "TWAPOSITIONMONITOR" } "FILLVAL" CDF_DOUBLE { -1.0e+31 } "FORMAT" CDF_CHAR { "f12.5" } "LABLAXIS" CDF_CHAR { "TWAPOSITIONMONITOR" } "UNITS" CDF_CHAR { " " } "VALIDMIN" CDF_DOUBLE { -1000000.00000 } "VALIDMAX" CDF_DOUBLE { 1000000.00000 } "VAR_TYPE" CDF_CHAR { "data" } . ! RV values were not requested. #end