<_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/i2_av_snt_00000000_v01.json (from all.xml) spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Santiago/PT22S <_ResourceID>Source: https://github.com/rweigel/cdawmeta-spase/blob/main/ResourceID.json ISIS-2 Topside Sounder Ionogram over Santiago, Chile (lat/lon=-33/298) <_ResourceName>Source: Master/CDFglobalAttributes/Logical_source_description I2_AV_SNT <_AlternateName>Source: Master/CDFglobalAttributes/Logical_source This ionogram was digitized from the original ISIS 2 analog telemetry data on 7-track tape using the facilities of the Data Evaluation Laboratory at GSFC (Code 500). This data restoration project is headed by Dr. R.F. Benson (GSFC, Code 692). Ionograms were digitized at the rate of 40,000 16-bit samples/sec. This sample rate is higher than the Nyquist frequency of 30 kHz. The sample frequency of 40 kHz provides a measurement every 25 microseconds corresponding to an apparent range (c*t/2) interval of 3.747 km. Each ionogram consists of a fixed-frequency and and a swept-frequency portion. The time resolution is typically 24 seconds. More information can be found at https://nssdc/space/isis/isis-status.html <_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/ ISIS/Alouette Topside Sounder Data Restoration Project Site https://spdf.gsfc.nasa.gov/isis/isis-status.html ISIS/Alouette Page maintained by NASA GSFC with Science and Instrument Descriptions, Data Access, Software, and Publication Lists <_Note>URL also in all.xml, master. Using InformationURL.json. NSSDC Master Catalog https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1969-009A Information about the Swept Frequency Sounder, SFS, Experiment on ISIS 1 <_Note>Source: InformationURL.json Topside Sounder Ionogram <_DOI>Source: https://github.com/rweigel/cdawmeta-spase/blob/main/DOI.json <_AccessInformation>Source: https://github.com/rweigel/cdawmeta-spase/blob/main/AccessInformation.json 1973-06-15T09:48:17Z 1980-03-21T09:09:03Z <_TemporalDescription>Generated from all.xml/@timerange_start and all.xml/@timerange_stop PT0.022S <_Cadence>Counts based on variable 'Epoch' in https://cdaweb.gsfc.nasa.gov/sp_phys/data/isis/ionogram_cdf/isis2/SNT_33S_298E/1973/166/i2_av_snt_1973166094817_v01.cdf. The most common cadence, 22 [ms] = PT0.022S, occurred for all 636 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/ISIS2/SFS spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: R.F. Benson at NASA GSFC HTTPS from SPDF https://cdaweb.gsfc.nasa.gov/pub/data/isis/topside_sounder/ionogram_cdf/isis2/SNT_33S_298E In CDF via HTTP from CDAWeb i2_av_snt_%Y%j%H%M%S_%Q.cdf %Y/%j I2_AV_SNT CDF spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: R.F. Benson at NASA GSFC FTPS from SPDF ftps://cdaweb.gsfc.nasa.gov/pub/data/isis/topside_sounder/ionogram_cdf/isis2/SNT_33S_298E In CDF via HTTP from CDAWeb i2_av_snt_%Y%j%H%M%S_%Q.cdf %Y/%j I2_AV_SNT CDF spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: R.F. Benson at NASA GSFC 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. I2_AV_SNT 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: R.F. Benson at NASA GSFC CDAWeb Web Service user interface https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?index=sp_phys&dataset=I2_AV_SNT I2_AV_SNT 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: R.F. Benson at NASA GSFC CDAWeb Python Script https://cdaweb.gsfc.nasa.gov/WS/cdasr/1/dataviews/sp_phys/datasets/I2_AV_SNT/clientLibraryExample/ I2_AV_SNT 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: R.F. Benson at NASA GSFC 4D Orbit Viewer https://sscweb.gsfc.nasa.gov/4dorbit/?sc=I2_AV_SNT I2_AV_SNT 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: R.F. Benson at NASA GSFC CDAWeb HAPI Server https://hapi-server.org/servers/#server=CDAWeb&dataset=I2_AV_SNT I2_AV_SNT 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: R.F. Benson at NASA GSFC CDAWeb HAPI Script in Multiple Languages https://hapi-server.org/servers/#server=CDAWeb&dataset=I2_AV_SNT&return=script I2_AV_SNT 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: R.F. Benson at NASA GSFC HAPI visualizations https://hapi-server.org/plot/?server=https://cdaweb.gsfc.nasa.gov/hapi&dataset=I2_AV_SNT&format=gallery I2_AV_SNT Web Service that generates plots. See https://hapi-server.org/plot/ for the API. PNG PDF SVG International Satellite for Ionosphere Studies 2 (from all.xml/observatory/description/@short) Santiago (from all.xml/instrument/description/@short) Space Physics (from Master/CDFglobalAttributes/Discipline) Ionospheric Science (from Master/CDFglobalAttributes/Discipline) ISIS-2 (from Master/CDFglobalAttributes/Source_name) International Satellite for Ionosphere Studies 2 (from Master/CDFglobalAttributes/Source_name) AV (from Master/CDFglobalAttributes/Data_type) Average Ionogram (from Master/CDFglobalAttributes/Data_type) SNT (from all.xml/instrument/@ID) Earth.NearSurface.Ionosphere Earth.Magnetosphere Earth.NearSurface.AuroralRegion Earth.NearSurface.EquatorialRegion Earth.NearSurface.Ionosphere.Topside Earth.Magnetosphere.Polar Earth.NearSurface.PolarCap Earth.NearSurface Spectrum Waves.Active Time Epoch CATDESC: 'Time'. 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.' ms Scalar Temporal Apparent Range ampl Master CDF CATDESC: 'Sounder amplitude at 223 virtual heights for fixed & swept frequency'. Master CDF VAR_NOTES: ' '. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' -128 223 interpolated frequencies freq Master CDF CATDESC: 'interpolated fixed & sweep frequencies'. Master CDF VAR_NOTES: 'This variable could be used as x-axis on amplitude spectrograms if fixed part is subtracted.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' MHz -1e+31