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

https://doi.org/10.48322/4mxn-2e20

2021-05-31 12:34:56.789

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

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

Online

Open

CDF

None

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

Online

Open

CSV

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

PT12S

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

01-Jan-1990 00:00:00.000

31-Dec-2029 23:59:59.999

31-Dec-9999 23:59:59.999

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

-1.0e+31

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

-1.0e+31

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

-1.0e+31

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

-1.0e+31

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

-1.0e+31

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

-1.0e+31

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

-1.0e+31

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

-1.0e+31

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

0.0

360.0

-1.0e+31

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

0.0

360.0

-1.0e+31

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

-90.0

90.0

-1.0e+31

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

0.0

1.0e+30

-1.0e+31