Averaged Wind SWE electron pitch angle data (12-15 seconds rate) from a later mode (post-VEIS-era) of the electron instrument. The electron pitch-angle distribution averages included in this data set are derived from integrating the electron pitch-angle distributions measured by the Wind/SWE electron instrument (see Ogilvie et al., "SWE, a comprehensive plasma instrument for the Wind spacecraft", Space Sci. Rev., 71, 55, 1995). Averages of phase-space density (f) over key regions of the unit sphere (the set of all possible electron velocity directions) are computed from 9s measurements which are usually separated by one or more 3s spin-periods. These quantities are reliable and citable with caution, meaning that the PI advises that the user should discuss their interpretations with a member of the SWE science team before publishing. The following comments are intended to aid in the use and interpretation of the averages reported in this data set. We begin this analysis with a measure of f for each pitch-angle bin, six degrees in width, from 0 degrees (flux nearly parallel to B) to 180 degrees (flux nearly anti-parallel with B). The f values for pitch-angles from 0-90 degrees (parallel streaming) are integrated (with angluar weighting and assumptions of gyrotropy) over this half-sphere, then averaged by dividing out the 2-pi solid angle of the half-sphere; the result being referred to as the 'f_para' average. Similarly, the 'f_perp' (flux nearly perpendicular to B) average is the result of integrating f for pitch-angles from 60-120 degrees (a region also 2-pi in solid angle). Next, the 'f_anti' (flux nearly anti-parallel to B) average covers the half-sphere of "backward" streaming electrons; having pitch-angles from 90-180 degrees. Finally, the 'f_omni' (omni-directional) average provides the integral of f over the full sphere, divided by the full 4-pi solid angle; providing a measure of total electron flux into the region of observation. The above analysis is carried out for each of 13 energy channels: E = 19.34, 38.68, 58.03, 77.37, 96.71, 116.1, 193.4, 290.1, 425.5, 580.3, 773.7, 1006., and 1238. eV. For reference, the electron speeds ( V , in cm/s) corresponding to these energies are reported in this data set. Hence the data set reported here contains: f_para, f_perp, f_anti, f_omni (for each of 13 values of E), and the 13 values of V (constant, included for reference).

Version:2.2.9

- ResourceHeader
- ResourceName
- Wind Solar Wind Experiment (SWE) Averaged Electron Pitch Angle Distribution (12-15s rate)

- AlternateName
- WI_M0_SWE_v01

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

- Description
Averaged Wind SWE electron pitch angle data (12-15 seconds rate) from a later mode (post-VEIS-era) of the electron instrument. The electron pitch-angle distribution averages included in this data set are derived from integrating the electron pitch-angle distributions measured by the Wind/SWE electron instrument (see Ogilvie et al., "SWE, a comprehensive plasma instrument for the Wind spacecraft", Space Sci. Rev., 71, 55, 1995). Averages of phase-space density (f) over key regions of the unit sphere (the set of all possible electron velocity directions) are computed from 9s measurements which are usually separated by one or more 3s spin-periods. These quantities are reliable and citable with caution, meaning that the PI advises that the user should discuss their interpretations with a member of the SWE science team before publishing. The following comments are intended to aid in the use and interpretation of the averages reported in this data set. We begin this analysis with a measure of f for each pitch-angle bin, six degrees in width, from 0 degrees (flux nearly parallel to B) to 180 degrees (flux nearly anti-parallel with B). The f values for pitch-angles from 0-90 degrees (parallel streaming) are integrated (with angluar weighting and assumptions of gyrotropy) over this half-sphere, then averaged by dividing out the 2-pi solid angle of the half-sphere; the result being referred to as the 'f_para' average. Similarly, the 'f_perp' (flux nearly perpendicular to B) average is the result of integrating f for pitch-angles from 60-120 degrees (a region also 2-pi in solid angle). Next, the 'f_anti' (flux nearly anti-parallel to B) average covers the half-sphere of "backward" streaming electrons; having pitch-angles from 90-180 degrees. Finally, the 'f_omni' (omni-directional) average provides the integral of f over the full sphere, divided by the full 4-pi solid angle; providing a measure of total electron flux into the region of observation. The above analysis is carried out for each of 13 energy channels: E = 19.34, 38.68, 58.03, 77.37, 96.71, 116.1, 193.4, 290.1, 425.5, 580.3, 773.7, 1006., and 1238. eV. For reference, the electron speeds ( V , in cm/s) corresponding to these energies are reported in this data set. Hence the data set reported here contains: f_para, f_perp, f_anti, f_omni (for each of 13 values of E), and the 13 values of V (constant, included for reference).

- Acknowledgement
- Please acknowledge the Wind/SWE electron instrument team and NASA/GSFC.
- Contacts
Role Person 1. PrincipalInvestigator spase://SMWG/Person/Keith.W.Ogilvie - InformationURL
- Name
- Wind/SWE Description

- Description
Wind/SWE (Solar Wind Experiment) electron instruments, history and data products

- PriorIDs
- spase://VHO/NumericalData/Wind/SWE/M0_PT12S
- spase://VSPO/NumericalData/Wind/SWE/M0/PT12S

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

- Availability
- Online

- AccessRights
- Open

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

- Description
Repository of the Wind/SWE M0 (v01) electron data.

- AccessURL
- Name
- HTTPS from SPDF

- Description
In CDF via HTTP from SPDF

- AccessURL
- Name
- CDAWeb

- ProductKey
- WI_M0_SWE

- Format
- CDF

- Acknowledgement
- Please acknowledge the CDAWeb team and NASA/GSFC's NSSDC.

- ProviderResourceName
- WI_M0_SWE

- ProviderVersion
- v01

- MeasurementType
- ThermalPlasma

- TemporalDescription
- TimeSpan
- StartDate
- 2002-08-16 00:00:00Z

- RelativeStopDate
- -P2M

- Note
- Time span ranges from instrument reconfiguration up to present.

- Cadence
- PT12S

- Exposure
- PT09S

- ObservedRegion
- Heliosphere.NearEarth

- ObservedRegion
- Heliosphere.Inner

- ObservedRegion
- Earth.Magnetosheath

- ObservedRegion
- Earth.Magnetosphere.Magnetotail

- Parameter #1
- Name
- Time

- ParameterKey
- Epoch

- Description
Timestamp marks beginning of a measurement interval.

- Caveats
- Measurements are from observations over three spin periods, totaling approx 9 sec, but read out about every 12-15 sec, depending on real-time telemetery throughput.
- Units
- CDF_Epoch
- 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
- Electron Speed

- ParameterKey
- Ve

- Description
Electron speed corresponding to fluxes, by channel (constant, included for reference).

- Units
- cm/s
- UnitsConversion
- 1e-2>m/s
- RenderingHints
- DisplayType
- StackPlot

- AxisLabel
- Ve

- ValueFormat
- E12.5

- ScaleType
- LinearScale

- Structure
- Size
- 13

- Description
For energy channel EXX, Ve[XX] gives the corresponding electron speed (cm/s).

- ValidMin
- 0.0
- ValidMax
- 1.0E10
- FillValue
- -1.0E31
- Particle
- ParticleType
- Electron

- Qualifier
- Magnitude

- ParticleQuantity
- Velocity

- Parameter #3
- Name
- Electron flux, parallel average

- ParameterKey
- f_para

- Description
Electron flux, parallel average, by channel. For each flux value, f_para[i], Ve[i] gives the corresponding electron speed (cm/s).

- Units
- #/[cc*(cm/s)^3*str]
- RenderingHints
- DisplayType
- StackPlot

- AxisLabel
- f_para

- ValueFormat
- E12.5

- ScaleType
- LogScale

- Structure
- Size
- 13

- Description
For energy channel EXX, f_para[XX] gives the contents (for fluxes with directions roughly parallel to B) of energy-bin XX=: 00, 01, ..., 12.

- ValidMin
- 1.0E-33
- ValidMax
- 1.0E-23
- FillValue
- -1.0E31
- Particle
- ParticleType
- Electron

- Qualifier
- Vector

- Qualifier
- Average

- ParticleQuantity
- PhaseSpaceDensity

- Parameter #4
- Name
- Electron flux, perpendicular average

- ParameterKey
- f_perp

- Description
Electron flux, perpendicular average, by channel. For each flux value, f_perp[i], Ve[i] gives the corresponding electron speed (cm/s).

- Units
- #/[cc*(cm/s)^3*str]
- RenderingHints
- DisplayType
- StackPlot

- AxisLabel
- f_perp

- ValueFormat
- E12.5

- ScaleType
- LogScale

- Structure
- Size
- 13

- Description
For energy channel EXX, f_perp[XX] gives the contents (for fluxes with directions roughly perpendicular to B) of energy-bin XX=: 00, 01, ..., 12.

- ValidMin
- 1.0E-33
- ValidMax
- 1.0E-23
- FillValue
- -1.0E31
- Particle
- ParticleType
- Electron

- Qualifier
- Vector

- Qualifier
- Average

- ParticleQuantity
- PhaseSpaceDensity

- Parameter #5
- Name
- Electron flux, anti-parallel average

- ParameterKey
- f_anti

- Description
Electron flux, anti-parallel average, by channel. For each flux value, f_anti[i], Ve[i] gives the corresponding electron speed (cm/s).

- Units
- #/[cc*(cm/s)^3*str]
- RenderingHints
- DisplayType
- StackPlot

- AxisLabel
- f_anti

- ValueFormat
- E12.5

- ScaleType
- LogScale

- Structure
- Size
- 13

- Description
For energy channel EXX, f_anti[XX] gives the contents (for fluxes with directions roughly anti-parallel to B) of energy-bin XX=: 00, 01, ..., 12.

- ValidMin
- 1.0E-33
- ValidMax
- 1.0E-23
- FillValue
- -1.0E31
- Particle
- ParticleType
- Electron

- Qualifier
- Vector

- Qualifier
- Average

- ParticleQuantity
- PhaseSpaceDensity

- Parameter #6
- Name
- Electron flux, omni-directional average

- ParameterKey
- f_omni

- Description
Electron flux, omni-directional average, by channel. For each flux value, f_omni[i], Ve[i] gives the corresponding electron speed (cm/s).

- Units
- #/[cc*(cm/s)^3*str]
- RenderingHints
- DisplayType
- StackPlot

- AxisLabel
- f_omni

- ValueFormat
- E12.5

- ScaleType
- LogScale

- Structure
- Size
- 13

- Description
For energy channel EXX, f_omni[XX] gives the contents (for fluxes with any directions relative to B) of energy-bin XX=: 00, 01, ..., 12.

- ValidMin
- 1.0E-33
- ValidMax
- 1.0E-23
- FillValue
- -1.0E31
- Particle
- ParticleType
- Electron

- Qualifier
- Vector

- Qualifier
- Average

- ParticleQuantity
- PhaseSpaceDensity