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.

Version:2.3.0

- ResourceHeader
- ResourceName
- Wind Solar Wind Experiment (SWE) Strahl Detector Two Dimensional Electron Angular Distributions, (H4), 12 s Data

- ReleaseDate
- 2020-07-07 21:16:06Z

- Description
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.

- Acknowledgement
- K. Ogilvie
- Contacts
Role Person 1. PrincipalInvestigator spase://SMWG/Person/Keith.W.Ogilvie 2. MetadataContact spase://SMWG/Person/Robert.E.McGuire 3. MetadataContact spase://SMWG/Person/Lee.Frost.Bargatze - InformationURL
- Name
- readme

- Description
Wind STRAHL0

- InformationURL
- Name
- web site

- Description
Wind Project

- PriorIDs
- spase://VSPO/NumericalData/Wind/SWE/Strahl/PT12S

- AccessInformation
- RepositoryID
- spase://SMWG/Repository/NASA/GSFC/SPDF

- Availability
- Online

- AccessRights
- Open

- AccessURL
- Name
- FTPS from SPDF (not with most browsers)

- Description
Access to Data in CDF Format via ftp from SPDF

- AccessURL
- Name
- HTTPS from SPDF

- Description
Access to Data in CDF Format via http from SPDF

- AccessURL
- Name
- CDAWeb

- ProductKey
- WI_STRAHL0_SWE

- Description
Access to ASCII, CDF, and Plots via NASA/GSFC CDAWeb

- Format
- CDF

- Encoding
- None

- Acknowledgement
- K. Ogilvie. Please acknowledge the Data Providers and CDAWeb when using these Data.

- ProcessingLevel
- Calibrated

- MeasurementType
- EnergeticParticles

- TemporalDescription
- TimeSpan
- StartDate
- 1995-01-01 00:00:00.000

- StopDate
- 2001-05-30 23:59:59.999

- Cadence
- PT12S

- ObservedRegion
- Heliosphere

- ObservedRegion
- Heliosphere.Inner

- ObservedRegion
- Heliosphere.NearEarth

- Parameter #1
- Name
- Epoch Time

- ParameterKey
- Epoch

- Description
Epoch Time, Nominal Time of the Strahl Measurement, Milliseconds since 1 AD

- Caveats
- Measurements of the Strahl and Antistrahl are taken within a single 3 s Spin Period This parameter exhibits an increasing monotonic progression.
- Cadence
- PT12S
- Units
- ms
- UnitsConversion
- 1.0e-3>s
- RenderingHints
- ScaleType
- LinearScale

- ValidMin
- 01-Jan-1990 00:00:00.000
- ValidMax
- 31-Dec-2029 23:59:59.999
- FillValue
- 31-Dec-9999 23:59:59.999
- Support
- SupportQuantity
- Temporal

- Parameter #2
- Name
- f Strahl Intensities versus Phi and Theta, Log Scale

- Set
- Time series defined by using: EPOCH

- ParameterKey
- f_strahl

- Description
f Strahl Intensities versus Phi and Theta Angles in Sweep Energy Order, Logarithmic Scale, Animated GIFs

- Caveats
- 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.
- Cadence
- PT12S
- Units
- cm^-3 (cm/s)^-3
- UnitsConversion
- 1>m^-3 (m/s)^-3
- RenderingHints
- AxisLabel
- f_strahl

- ValueFormat
- E12.5

- ScaleType
- LogScale

- Structure
- Size
- 14 12

- FillValue
- -1.0e+31
- Particle
- ParticleType
- Electron

- ParticleQuantity
- NumberFlux

- Parameter #3
- Name
- f Strahl Intensities versus Phi and Theta, Linear Scale

- Set
- Time series defined by using: EPOCH

- ParameterKey
- f_strahl_lin

- Description
f Strahl Intensities versus Phi and Theta Angles in Sweep Energy Order, Linear Scale, Animated GIFs

- Caveats
- 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.
- Cadence
- PT12S
- Units
- cm^-3 (cm/s)^-3
- UnitsConversion
- 1>m^-3 (m/s)^-3
- RenderingHints
- AxisLabel
- f_strahl

- ValueFormat
- E12.5

- ScaleType
- LinearScale

- Structure
- Size
- 14 12

- FillValue
- -1.0e+31
- Particle
- ParticleType
- Electron

- ParticleQuantity
- NumberFlux

- Parameter #4
- Name
- f Antistrahl Intensities versus Phi and Theta, Log Scale

- Set
- Time series defined by using: EPOCH

- ParameterKey
- f_antistrahl

- Description
f Antistrahl Intensities versus Phi and Theta Angles in Sweep Energy Order, Logarithmic Scale, Animated GIFs

- Caveats
- 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.
- Cadence
- PT12S
- Units
- cm^-3 (cm/s)^-3
- UnitsConversion
- 1>m^-3 (m/s)^-3
- RenderingHints
- AxisLabel
- f_antistrahl

- ValueFormat
- E12.5

- ScaleType
- LogScale

- Structure
- Size
- 14 12

- FillValue
- -1.0e+31
- Particle
- ParticleType
- Electron

- ParticleQuantity
- NumberFlux

- Parameter #5
- Name
- f Antistrahl Intensities versus Phi and Theta, Linear Scale

- Set
- Time series defined by using: EPOCH

- ParameterKey
- f_antistrahl_lin

- Description
f Antistrahl Intensities versus Phi and Theta Angles in Sweep Energy Order, Linear Scale, Animated GIFs

- Caveats
- 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.
- Cadence
- PT12S
- Units
- cm^-3 (cm/s)^-3
- UnitsConversion
- 1>m^-3 (m/s)^-3
- RenderingHints
- AxisLabel
- f_antistrahl

- ValueFormat
- E12.5

- ScaleType
- LinearScale

- Structure
- Size
- 14 12

- FillValue
- -1.0e+31
- Particle
- ParticleType
- Electron

- ParticleQuantity
- NumberFlux

- Parameter #6
- Name
- f Strahl Count versus Phi and Theta, Log Scale

- Set
- Time series defined by using: EPOCH

- ParameterKey
- f_strahl_counts

- Description
f Strahl Counts versus Phi and Theta Angles in Sweep Energy Order, Logarithmic Scale, Animated GIFs

- Caveats
- 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.
- Cadence
- PT12S
- RenderingHints
- AxisLabel
- f_strahl_counts

- ValueFormat
- E12.5

- ScaleType
- LogScale

- Structure
- Size
- 14 12

- FillValue
- -1.0e+31
- Particle
- ParticleType
- Electron

- ParticleQuantity
- Counts

- Parameter #7
- Name
- f Strahl Count versus Phi and Theta, Linear Scale

- Set
- Time series defined by using: EPOCH

- ParameterKey
- f_strahl_counts_lin

- Description
f Strahl Counts versus Phi and Theta Angles in Sweep Energy Order, Linear Scale, Animated GIFs

- Caveats
- 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.
- Cadence
- PT12S
- RenderingHints
- AxisLabel
- f_strahl_counts

- ValueFormat
- E12.5

- ScaleType
- LinearScale

- Structure
- Size
- 14 12

- FillValue
- -1.0e+31
- Particle
- ParticleType
- Electron

- ParticleQuantity
- Counts

- Parameter #8
- Name
- f Antistrahl Count versus Phi and Theta, Log Scale

- Set
- Time series defined by using: EPOCH

- ParameterKey
- f_antistrahl_counts

- Description
f Antistrahl Counts versus Phi and Theta Angles in Sweep Energy Order, Logarithmic Scale, Animated GIFs

- Caveats
- 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.
- Cadence
- PT12S
- RenderingHints
- AxisLabel
- f_antistrahl_counts

- ValueFormat
- E12.5

- ScaleType
- LogScale

- Structure
- Size
- 14 12

- FillValue
- -1.0e+31
- Particle
- ParticleType
- Electron

- ParticleQuantity
- Counts

- Parameter #9
- Name
- f Antistrahl Count versus Phi and Theta, Linear Scale

- Set
- Time series defined by using: EPOCH

- ParameterKey
- f_antistrahl_counts_lin

- Description
f Antistrahl Counts versus Phi and Theta Angles in Sweep Energy Order, Linear Scale, Animated GIFs

- Caveats
- 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.
- Cadence
- PT12S
- RenderingHints
- AxisLabel
- f_antistrahl_counts

- ValueFormat
- E12.5

- ScaleType
- LinearScale

- Structure
- Size
- 14 12

- FillValue
- -1.0e+31
- Particle
- ParticleType
- Electron

- ParticleQuantity
- Counts

- Parameter #10
- Name
- Electron Velocity Direction, Phi Angle, Strahl

- Set
- Time series defined by using: EPOCH

- ParameterKey
- phi_strahl

- Description
The Phi (GSE) associated with the Unit Vector pointing in Electron Velocity Direction for the Strahl Distribution

- Caveats
- phi_strahl corresponds with Azimuthal Directions (phi GSE) sampled during the Measurement of f_strahl
- Cadence
- PT12S
- Units
- °
- UnitsConversion
- 0.0174532925>rad
- CoordinateSystem
- CoordinateRepresentation
- Spherical

- CoordinateSystemName
- GSE

- RenderingHints
- DisplayType
- Spectrogram

- AxisLabel
- Phi (strahl)

- ValueFormat
- E12.5

- ScaleType
- LinearScale

- Structure
- Size
- 14

- ValidMin
- 0.0
- ValidMax
- 360.0
- FillValue
- -1.0e+31
- Particle
- ParticleType
- Electron

- Qualifier
- DirectionAngle.AzimuthAngle

- ParticleQuantity
- ArrivalDirection

- Parameter #11
- Name
- Electron Velocity Direction, Phi Angle, Antistrahl

- Set
- Time series defined by using: EPOCH

- ParameterKey
- phi_antistrahl

- Description
The Phi (GSE) associated with the Unit Vector pointing in Electron Velocity Direction for the Antistrahl Distribution

- Caveats
- phi_antistrahl corresponds with Azimuthal Directions (phi GSE) sampled during the Measurement of f_antistrahl
- Cadence
- PT12S
- Units
- °
- UnitsConversion
- 0.0174532925>rad
- CoordinateSystem
- CoordinateRepresentation
- Spherical

- CoordinateSystemName
- GSE

- RenderingHints
- DisplayType
- Spectrogram

- AxisLabel
- Phi (anti-strahl)

- ValueFormat
- E12.5

- ScaleType
- LinearScale

- Structure
- Size
- 14

- ValidMin
- 0.0
- ValidMax
- 360.0
- FillValue
- -1.0e+31
- Particle
- ParticleType
- Electron

- Qualifier
- DirectionAngle.AzimuthAngle

- ParticleQuantity
- ArrivalDirection

- Parameter #12
- Name
- Electron Velocity Direction, Theta Angle

- Set
- Time series defined by using: EPOCH

- ParameterKey
- theta

- Description
The Theta (GSE) associated with unit vector pointing in electron velocity direction

- Caveats
- The 12 Anodes of the SWE Strahl Detector are arranged in a fixed Pattern, with non-uniform Spacing
- Cadence
- PT12S
- Units
- °
- UnitsConversion
- 0.0174532925>rad
- CoordinateSystem
- CoordinateRepresentation
- Spherical

- CoordinateSystemName
- GSE

- RenderingHints
- DisplayType
- Spectrogram

- AxisLabel
- Theta

- ValueFormat
- E12.5

- ScaleMin
- -40.0

- ScaleMax
- 40.0

- ScaleType
- LinearScale

- Structure
- Size
- 12

- ValidMin
- -90.0
- ValidMax
- 90.0
- FillValue
- -1.0e+31
- Particle
- ParticleType
- Electron

- Qualifier
- DirectionAngle.PolarAngle

- ParticleQuantity
- ArrivalDirection

- Parameter #13
- Name
- Electron Energy

- Set
- Time series defined by using: EPOCH

- ParameterKey
- energy

- Description
Energy of the Sampled Electrons used to construct the f Strahl and f_antistrahl distributions

- Caveats
- The Strahl Detector swept through 32 different Energies, one at a Time, with about 12 s between each Energy Step
- Cadence
- PT12S
- Units
- eV
- UnitsConversion
- 1.602176565e-19>J
- RenderingHints
- AxisLabel
- Energy (in eV)

- ValueFormat
- E12.5

- ScaleType
- LinearScale

- ValidMin
- 0.0
- ValidMax
- 1.0e+30
- FillValue
- -1.0e+31
- Particle
- ParticleType
- Electron

- ParticleQuantity
- Energy