2.7.1 https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions spase://NASA/NumericalData/Wind/SWE/Strahl/PT12S NASA NumericalData Wind Solar Wind Experiment (SWE) Strahl Detector Two Dimensional Electron Angular Distributions, (H4), 12 s Data https://doi.org/10.48322/4mxn-2e20 2025-12-04T13:33:08Z 2021-05-31T12:34:56.789 Updated to SPASE Version 2.3.2 if needed, Applied quality control for DOI usage, LFB 2025-10-03T11:24:32Z Updated PublishedBy name to match ROR Registry. Added ResourceType and NamingAuthority. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Matched version number in schemaLocation attribute to updated value in Version tag. ZCB 2025-12-04T13:33:08Z Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB Explanatory Notes: The 2D Electron Angular Distributions included in this Data Set were measured by the Wind/SWE Strahl Detector (see Ogilvie et al., "SWE, a Comprehensive Plasma Instrument for the Wind Spacecraft", Space Sci. Rev., 71, 55, 1995). Each Angular Distribution was measured at a single Electron Energy. The Energy was selected by applying a Voltage between the Electrostatic Analyzer Plates. The Detector sampled 32 Energies between 19 eV and 1238 eV, and during normal Operation would Sweep through these Energies one at a Time with approximately 12 s Cadence. The 12 Anodes of the Instrument are set in a vertical Pattern in a Plane that contains the Spacecraft Spin Axis, spanning a Field of View +/-28° centered around the Ecliptic (with uneven Angular spacing between Anodes). The Wind Spacecraft Spin Axis is set at a Right Angle with the Ecliptic Plane, allowing different Azimuthal Angles to be sampled as the Spacecraft Spins (3 s Spin Period). These Azimuthal Bins have a Fixed Separation of 3.53°. Each Strahl (and Antistrahl) Distribution measured by the Spacecraft consists of a 14 ⨯ 12 Angular Grid of Electron Counts, that was measured at a Fixed Energy during a single Spacecraft Spin. Counts are converted into Physical Units of f(v) (e.g., cm^-6s^3) in the standard Fashion by accounting for the Detector Efficiency and Geometric Factor. The Data Set reported here contains: f_strahl, f_antistrahl, f_strahl_counts, f_antistrahl_counts, phi_strahl, phi_antistrahl, theta, energy. K. Ogilvie Ogilvie, Keith W.; Horaites, Konstantinos; Merka, Jan; Vinas, Adolfo F.; & Fitzenreiter, Richard J. 2021-01-01T00:00:00 Space Physics Data Facility spase://SMWG/Person/Keith.W.Ogilvie PrincipalInvestigator spase://SMWG/Person/Robert.E.McGuire MetadataContact spase://SMWG/Person/Lee.Frost.Bargatze MetadataContact readme https://cdaweb.gsfc.nasa.gov/data/wind/swe/strahl0/readme_wind_strahl0_cdf.txt Wind STRAHL0 web site https://wind.nasa.gov/ Wind Project spase://VSPO/NumericalData/Wind/SWE/Strahl/PT12S spase://SMWG/Repository/NASA/GSFC/SPDF Online Open https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products FTPS from SPDF (not with most browsers) ftps://spdf.gsfc.nasa.gov/pub/data/wind/swe/strahl0/ Access to Data in CDF Format via ftp from SPDF HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/wind/swe/strahl0/ Access to Data in CDF Format via http from SPDF CDAWeb https://cdaweb.gsfc.nasa.gov/index.html/ WI_STRAHL0_SWE Access to ASCII, CDF, and Plots via NASA/GSFC CDAWeb CDF None K. Ogilvie. Please acknowledge the Data Providers and CDAWeb when using these Data. spase://SMWG/Repository/NASA/GSFC/SPDF Online Open https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products CDAWeb HAPI Server https://cdaweb.gsfc.nasa.gov/hapi WI_STRAHL0_SWE Web Service to this product using the HAPI interface. CSV K. Ogilvie. Please acknowledge the Data Providers and CDAWeb when using these Data. Calibrated spase://SMWG/Instrument/Wind/SWE EnergeticParticles 1995-01-01T00:00:00.000 2001-05-30T23:59:59.999 PT12S Heliosphere Heliosphere.Inner Heliosphere.NearEarth Epoch Time Epoch Epoch Time, Nominal Time of the Strahl Measurement, Milliseconds since 1 AD Measurements of the Strahl and Antistrahl are taken within a single 3 s Spin Period This parameter exhibits an increasing monotonic progression. PT12S ms 1.0e-3>s LinearScale 01-Jan-1990 00:00:00.000 31-Dec-2029 23:59:59.999 31-Dec-9999 23:59:59.999 Temporal f Strahl Intensities versus Phi and Theta, Log Scale Time series defined by using: EPOCH f_strahl f Strahl Intensities versus Phi and Theta Angles in Sweep Energy Order, Logarithmic Scale, Animated GIFs 2D Angular Electron Distribution in Physical Units of #/(cm^3*(cm/s)^3). Measured at Fixed Energy in a Fraction of a single Spacecraft Spin. f_strahl corresponds with the Anti-sunward, Field-aligned Portion of the Distribution Function, which likely exhibits a pronounced Strahl Signature. PT12S cm^-3 (cm/s)^-3 1>m^-3 (m/s)^-3 f_strahl E12.5 LogScale 14 12 -1.0e+31 Electron NumberFlux f Strahl Intensities versus Phi and Theta, Linear Scale Time series defined by using: EPOCH f_strahl_lin f Strahl Intensities versus Phi and Theta Angles in Sweep Energy Order, Linear Scale, Animated GIFs 2D Angular Electron Distribution in Physical Units of #/(cm^3*(cm/s)^3). Measured at Fixed Energy in a Fraction of a single Spacecraft Spin. f_strahl corresponds with the Anti-sunward, Field-aligned Portion of the Distribution Function, which likely exhibits a pronounced Strahl Signature. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: f_strahl. PT12S cm^-3 (cm/s)^-3 1>m^-3 (m/s)^-3 f_strahl E12.5 LinearScale 14 12 -1.0e+31 Electron NumberFlux f Antistrahl Intensities versus Phi and Theta, Log Scale Time series defined by using: EPOCH f_antistrahl f Antistrahl Intensities versus Phi and Theta Angles in Sweep Energy Order, Logarithmic Scale, Animated GIFs 2D Angular Electron Distribution in Physical Units of #/(cm^3*(cm/s)^3). Measured at Fixed Energy in a Fraction of a single Spacecraft Spin. f_antistrahl corresponds with the Sunward, Field-aligned Portion of the Distribution Function, which sometimes exhibits a pronounced Antistrahl Signature. PT12S cm^-3 (cm/s)^-3 1>m^-3 (m/s)^-3 f_antistrahl E12.5 LogScale 14 12 -1.0e+31 Electron NumberFlux f Antistrahl Intensities versus Phi and Theta, Linear Scale Time series defined by using: EPOCH f_antistrahl_lin f Antistrahl Intensities versus Phi and Theta Angles in Sweep Energy Order, Linear Scale, Animated GIFs 2D Angular Electron Distribution in Physical Units of #/(cm^3*(cm/s)^3). Measured at Fixed Energy in a Fraction of a single Spacecraft Spin. f_antistrahl corresponds with the Sunward, Field-aligned Portion of the Distribution Function, which sometimes exhibits a pronounced Antistrahl Signature. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: f_antistrahl. PT12S cm^-3 (cm/s)^-3 1>m^-3 (m/s)^-3 f_antistrahl E12.5 LinearScale 14 12 -1.0e+31 Electron NumberFlux f Strahl Count versus Phi and Theta, Log Scale Time series defined by using: EPOCH f_strahl_counts f Strahl Counts versus Phi and Theta Angles in Sweep Energy Order, Logarithmic Scale, Animated GIFs 2D Angular Electron Distribution (Detector Counts). Measured at Fixed Energy in a Fraction of a single Spacecraft Spin. f_strahl corresponds with the Anti-sunward, Field-aligned Portion of the Distribution Function, which likely exhibits a pronounced Strahl Signature. PT12S f_strahl_counts E12.5 LogScale 14 12 -1.0e+31 Electron Counts f Strahl Count versus Phi and Theta, Linear Scale Time series defined by using: EPOCH f_strahl_counts_lin f Strahl Counts versus Phi and Theta Angles in Sweep Energy Order, Linear Scale, Animated GIFs 2D Angular Electron Distribution (Detector Counts). Measured at Fixed Energy in a Fraction of a single Spacecraft Spin. f_strahl corresponds with the Anti-sunward, Field-aligned Portion of the Distribution Function, which likely exhibits a pronounced Strahl Signature. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: f_strahl_counts. PT12S f_strahl_counts E12.5 LinearScale 14 12 -1.0e+31 Electron Counts f Antistrahl Count versus Phi and Theta, Log Scale Time series defined by using: EPOCH f_antistrahl_counts f Antistrahl Counts versus Phi and Theta Angles in Sweep Energy Order, Logarithmic Scale, Animated GIFs 2D Angular Electron Distribution (Detector Counts). Measured at fixed Energy in a Fraction of a single Spacecraft Spin. f_antistrahl corresponds with the Sunward, Field-aligned Portion of the Distribution Function, which sometimes exhibits a pronounced Antistrahl Signature. PT12S f_antistrahl_counts E12.5 LogScale 14 12 -1.0e+31 Electron Counts f Antistrahl Count versus Phi and Theta, Linear Scale Time series defined by using: EPOCH f_antistrahl_counts_lin f Antistrahl Counts versus Phi and Theta Angles in Sweep Energy Order, Linear Scale, Animated GIFs 2D Angular Electron Distribution (Detector Counts). Measured at fixed Energy in a Fraction of a single Spacecraft Spin. f_antistrahl corresponds with the Sunward, Field-aligned Portion of the Distribution Function, which sometimes exhibits a pronounced Antistrahl Signature. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: f_antistrahl_counts. PT12S f_antistrahl_counts E12.5 LinearScale 14 12 -1.0e+31 Electron Counts Electron Velocity Direction, Phi Angle, Strahl Time series defined by using: EPOCH phi_strahl The Phi (GSE) associated with the Unit Vector pointing in Electron Velocity Direction for the Strahl Distribution phi_strahl corresponds with Azimuthal Directions (phi GSE) sampled during the Measurement of f_strahl PT12S ° 0.0174532925>rad Spherical GSE Spectrogram Phi (strahl) E12.5 LinearScale 14 0.0 360.0 -1.0e+31 Electron DirectionAngle.AzimuthAngle ArrivalDirection Electron Velocity Direction, Phi Angle, Antistrahl Time series defined by using: EPOCH phi_antistrahl The Phi (GSE) associated with the Unit Vector pointing in Electron Velocity Direction for the Antistrahl Distribution phi_antistrahl corresponds with Azimuthal Directions (phi GSE) sampled during the Measurement of f_antistrahl PT12S ° 0.0174532925>rad Spherical GSE Spectrogram Phi (anti-strahl) E12.5 LinearScale 14 0.0 360.0 -1.0e+31 Electron DirectionAngle.AzimuthAngle ArrivalDirection Electron Velocity Direction, Theta Angle Time series defined by using: EPOCH theta The Theta (GSE) associated with unit vector pointing in electron velocity direction The 12 Anodes of the SWE Strahl Detector are arranged in a fixed Pattern, with non-uniform Spacing PT12S ° 0.0174532925>rad Spherical GSE Spectrogram Theta E12.5 -40.0 40.0 LinearScale 12 -90.0 90.0 -1.0e+31 Electron DirectionAngle.PolarAngle ArrivalDirection Electron Energy Time series defined by using: EPOCH energy Energy of the Sampled Electrons used to construct the f Strahl and f_antistrahl distributions The Strahl Detector swept through 32 different Energies, one at a Time, with about 12 s between each Energy Step PT12S eV 1.602176565e-19>J Energy (in eV) E12.5 LinearScale 0.0 1.0e+30 -1.0e+31 Electron Energy