<_Note>Nodes prefixed with a _ are not valid SPASE, but are included for debugging. Values prefixed with a x_ are not valid SPASE but may considered for addition for completeness. 2.6.1 <_MasterURL>https://cdaweb.gsfc.nasa.gov/pub/software/cdawlib/0JSONS/twins1_l1_lad_00000000_v01.json (from all.xml) spase://NASA/NumericalData/TWINS1/LAD/L1/PT1.333S <_ResourceID>Source: https://github.com/rweigel/cdawmeta-spase/blob/main/ResourceID.json TWINS Spacecraft 1 - Lyman Alpha Detector Level-1 Geocorona Data <_ResourceName>Source: Master/CDFglobalAttributes/Logical_source_description twins1_l1_lad <_AlternateName>Source: Master/CDFglobalAttributes/Logical_source 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.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/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.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.The TWINS Lyman-a Detector consists of two independent sensors to measure Lyman alpha radiation being emitted by neutral hydrogen atoms. The sensors oriented at angles of ..40 deg. with respect to the actuator spin axis. Each sensor has a FWHM field of view of 4 deg., defined by collimation hole baffles, uses Lyman-a interference filters as narrow band transmissions filters, and applies a KBr or CsI photodiode for photon detection. The Lyman-a detector is located on the rotating actuator platform to provide full 360 deg. azimuthal angle coverage Time resolution is 60 sec.More detailed information is available at the TWINS home page http://twins.swri.edu/ <_Description>Source: Master/CDFglobalAttributes/TEXT <_Rights> SPDX Creative Commons Zero v1.0 Universal https://spdx.org/licenses/CC0-1.0.html https://spdx.org/licenses/ Initial Inventory CDAWeb TWINS List of Events and Sample Plots https://cdaweb.gsfc.nasa.gov/TWINS_info.html Initial Inventory CDAWeb Two Wide-angle Imaging Neutral-atom Spectrometers, TWINS, List of Events and Sample Plots <_Note>URL also in all.xml, master. Using InformationURL.json. https://science.nasa.gov/mission/twins the TWINS Southwest Research Institute web site Release notes and other information available at <_Note>URL also in all.xml. Using master. TWINS Release Notes and other Information, SwRI Web Site https://earth.esa.int/web/eoportal/satellite-missions/t/twins/ Two Wide-angle Imaging Neutral-atom Spectrometers, TWINS, Release Notes and other Information, Southwest Research Institute, SwRI, Web Site <_Note>Source: InformationURL.json https://doi.org/10.48322/3ywd-rq04 <_DOI>Source: https://github.com/rweigel/cdawmeta-spase/blob/main/DOI.json <_AccessInformation>Source: https://github.com/rweigel/cdawmeta-spase/blob/main/AccessInformation.json 2007-07-06T07:15:10Z 2018-12-12T19:06:33Z <_TemporalDescription>Generated from all.xml/@timerange_start and all.xml/@timerange_stop PT1.333S <_Cadence>Counts based on variable 'Epoch' in https://cdaweb.gsfc.nasa.gov/sp_phys/data/twins/twins1/lad/2007/twins1_l1_lad_20070706_v01.cdf. The most common cadence, 1333 [ms] = PT1.333S, occurred for 2.9938% of the 808 timesteps. <_ObservedRegion>Source: https://github.com/rweigel/cdawmeta-spase/blob/main/ObservedRegion.json <_ProcessingLevel>Processing level is not available in the master file; it should be there instead of, say, https://github.com/rweigel/cdawmeta-spase/blob/main/ProcessingLevel.json spase://SMWG/Instrument/TWINS1/LAD ImageIntensity spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: D. McComas & H. Fahr at SwRI & U. Bonn, respectively. HTTPS from SPDF https://cdaweb.gsfc.nasa.gov/pub/data/twins/twins1/lad In CDF via HTTP from CDAWeb twins1_l1_lad_%Y%m%d_%Q.cdf %Y TWINS1_L1_LAD CDF spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: D. McComas & H. Fahr at SwRI & U. Bonn, respectively. FTPS from SPDF ftps://cdaweb.gsfc.nasa.gov/pub/data/twins/twins1/lad In CDF via HTTP from CDAWeb twins1_l1_lad_%Y%m%d_%Q.cdf %Y TWINS1_L1_LAD CDF spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: D. McComas & H. Fahr at SwRI & U. Bonn, respectively. CDAWeb Web Service https://cdaweb.gsfc.nasa.gov/WebServices/ Instructions for using web services to access this dataset an other other metadata and options for CDAWeb datasets. The ProductKey here corresponds to the query parameter 'dataset' in the tables at the AccessURL in a dataset-related request can be made. TWINS1_L1_LAD CDF CSV GIF NetCDF PNG PS PDF XML x_Script.IDL x_Script.Python Text.ASCII x_WAV spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: D. McComas & H. Fahr at SwRI & U. Bonn, respectively. CDAWeb Web Service user interface https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?index=sp_phys&dataset=TWINS1_L1_LAD TWINS1_L1_LAD Web service user interface for this product. CDF GIF PDF Text.ASCII x_WAV spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: D. McComas & H. Fahr at SwRI & U. Bonn, respectively. CDAWeb Python Script https://cdaweb.gsfc.nasa.gov/WS/cdasr/1/dataviews/sp_phys/datasets/TWINS1_L1_LAD/clientLibraryExample/ TWINS1_L1_LAD Web service that generates a Python script to access this product. x_Script.IDL x_Script.Python spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/SSCWeb. Please also acknowledge the data producer: D. McComas & H. Fahr at SwRI & U. Bonn, respectively. 4D Orbit Viewer https://sscweb.gsfc.nasa.gov/4dorbit/?sc=TWINS1_L1_LAD TWINS1_L1_LAD Web Service to this product. HTML spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb and the HAPI project. Please also acknowledge the data producer: D. McComas & H. Fahr at SwRI & U. Bonn, respectively. CDAWeb HAPI Server https://hapi-server.org/servers/#server=CDAWeb&dataset=TWINS1_L1_LAD TWINS1_L1_LAD Web Service to this product using the HAPI interface. CSV JSON Binary spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb and the HAPI project. Please also acknowledge the data producer: D. McComas & H. Fahr at SwRI & U. Bonn, respectively. CDAWeb HAPI Script in Multiple Languages https://hapi-server.org/servers/#server=CDAWeb&dataset=TWINS1_L1_LAD&return=script TWINS1_L1_LAD Web Service user interface that generates scripts in IDL, Javascript, MATLAB, Python, Autoplot, curl, wget to access this product. See https://hapi-server.org/servers/api for the API. x_Script.IDL x_Script.Javascript x_Script.MATLAB x_Script.Python x_Script.Autoplot x_Script.curl x_Script.wget spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb and the HAPI project. Please also acknowledge the data producer: D. McComas & H. Fahr at SwRI & U. Bonn, respectively. HAPI visualizations https://hapi-server.org/plot/?server=https://cdaweb.gsfc.nasa.gov/hapi&dataset=TWINS1_L1_LAD&format=gallery TWINS1_L1_LAD Web Service that generates plots. See https://hapi-server.org/plot/ for the API. PNG PDF SVG Two Wide-angle Imaging Neutral-atom Spectrometers (from all.xml/observatory/description/@short) Lyman Alpha Data (from all.xml/instrument/description/@short) Space Physics (from Master/CDFglobalAttributes/Discipline) Magnetospheric Science (from Master/CDFglobalAttributes/Discipline) TWINS1 (from Master/CDFglobalAttributes/Source_name) Two Wide-angle Imaging Neutral-atom Spectrometers (from Master/CDFglobalAttributes/Source_name) L1 (from Master/CDFglobalAttributes/Data_type) Level 1 (from Master/CDFglobalAttributes/Data_type) LAD (from all.xml/instrument/@ID) Earth.Magnetosphere.Magnetotail Earth.Magnetosphere Earth.Magnetosheath Earth.Magnetosphere.RadiationBelt Earth.Magnetosphere.Main Epoch Epoch CATDESC: 'Epoch'. Notes not in Master CDF: 'The units are the units in CDF files. For other web services, this variable is may be represented as a time string.' Scalar Temporal MJD Timestamp time Master CDF CATDESC: 'timestamps of the LAD data in Modified Julian Date'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' MJD -1e+31 Photon Intensity Toward lad1_data Master CDF CATDESC: 'LAD photon intensities from the Toward LAD sensor '. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Rayleigh -1e+31 Photon Intensity Away lad2_data Master CDF CATDESC: 'LAD photon intensities from the Away LAD sensor'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Rayleigh -1e+31 Actuator Position sector_position Master CDF CATDESC: 'Actuator Position at Sector start'. Master CDF VAR_NOTES: 'Values run from -90 to +90 degrees during a scan. Note that sectors are either 4 degrees wide (dynamic modes) or 1.333 sec long (static modes)'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' deg -1e+31 Photon Intensity Toward 0deg offset lad1_0_data Master CDF CATDESC: '[Diagnostic Use Only] LAD photon intensities from the Toward LAD sensor with 0 degree offset '. Master CDF VAR_NOTES: 'The LAD counters are read out each 0.67 seconds (corresponding to 2degree at the nominal TWA rotation rate of 3degree/s'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Rayleigh -1e+31 Photon Intensity Away 0deg offset lad2_0_data Master CDF CATDESC: '[Diagnostic Use Only] LAD photon intensities from the Away LAD sensor with 0 degree offset '. Master CDF VAR_NOTES: 'The LAD counters are read out each 0.67 seconds (corresponding to 2degree at the nominal TWA rotation rate of 3degree/s'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Rayleigh -1e+31 Photon Intensity Toward 2deg offset lad1_2_data Master CDF CATDESC: '[Diagnostic Use Only] LAD photon intensities from the Toward LAD sensor with 2 degree offset '. Master CDF VAR_NOTES: 'The LAD counters are read out each 0.67 seconds (corresponding to 2degree at the nominal TWA rotation rate of 3degree/s'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Rayleigh -1e+31 Photon Intensity Away 2deg offset lad2_2_data Master CDF CATDESC: '[Diagnostic Use Only] LAD photon intensities from the Away LAD sensor with 2 degree offset '. Master CDF VAR_NOTES: 'The LAD counters are read out each 0.67 seconds (corresponding to 2degree at the nominal TWA rotation rate of 3degree/s'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Rayleigh -1e+31