2.3.2 spase://NASA/NumericalData/Wind/SWE/H0/PT06S Wind Solar Wind Experiment (SWE) Electron Moments Parameters (6-12s rate) (1994-2001) WI_H0_SWE_v01 WI_H0_SWE_v02 https://doi.org/10.48322/2jxp-7x36 2021-05-31T12:34:56.789 2021-05-31T12:34:56.789 Updated to SPASE Version 2.3.2 if needed, Applied quality control for DOI usage, LFB Wind SWE electron moments included in this data set are derived from the velocity moments integration of solar wind electron distributions measured by the Wind/SWE VEIS instrument (see Ogilvie et al., "SWE, a comprehensive plasma instrument for the WIND spacecraft", Space Sci. Rev., 71, 55, 1955). Moments parameters are computed from 3s measurements which are spaced either 6s or 12s in time. The moments parameters which will be of value to most users of this data set are the electron temperature, the electron temperature anisotropy, and the electron heat flux vector. These quantities are reliable and citable with caution, meaning that the PI advises that the user should discuss their interpretation with a member of the SWE science team before publishing. The following comments are intended to aid in the use and interpretation of the prime quantities of this data set, the electron temperature, the electron temperature anisotropy, and the electron heat flux. (All vector quantities are in GSE coordinates.) The temperature and temperature anisotropy are normalized to the derived electron density and, therefore, are not sensitive to the uncertainty in the density determination as discussed below. The electron temperature is derived from the pressure tensor divided by the electron density and the Boltzmann constant. The three eigenvalues of the diagonalized temperature tensor are the temperature parallel to the tensor principal axis and the two perpendicular components of the temperature. The temperature anisotropy is defined here as the ratio of the parallel temperature to the average of the two perpendicular temperature components. The electron temperature is one-third of the trace of the diagonalized temperaturetensor. Also included is the unit vector along the principal axis of the pressure tensor as well as the cosine of the angle between the principal axis and the magnetic field vector. An indication that the principal axis has been uniquely defined is that the temperature anisotropy is significantly different from unity and that the principal axis and the magnetic field are nearly parallel or anti-parallel.The heat flux vector included here is significant only when the magnitude rises above the noise level, i.e., above the level 0.002 to 0.005 ergs/cm/cm/s. The heat flux may be low in magnitude either due to a nearly isotropic distribution, due to electron counter-streaming, or due to a low counting rate of the instrument. An indicator of a significant net heat flux is that the heat flux direction should track with the magnetic field direction. For this purpose, the cosine of the angle between the heat flux vector and the magnetic field is included, and should be close to -1 or +1 in order for the heat flux to be significant. In some cases it will be necessary to use electron pitch angle distributions (available on request from the SWE team) to decide whether low electron flux or counterstreaming account for a low net heat flux. It is also strongly recommended that 3s magnetic field data from the WIND/MFI experiment (not included in this data set) be used inconjunction with the SWE electron heat flux data to ensure a correct interpretation of the heat flux. The electron density and electron bulk flow velocity are also included in this data set but no claim is made for their accuracy. The electron flow velocity is usually within 10% to 20% of the solar wind flow velocity derived from the SWE Faraday cup experiment and which are found in the SWE key parameter data set. The electron density, however, cannot be absolutely determined due to the spacecraft potential and the fact that the electron instrument response has varied over time. The electron density determination includes a first order attempt to determine the spacecraft potential by imposing the charge neutrality condition on the derived electron density and Faraday cup ion density. The electron density will be within a few percent of the solar wind density derived from the Faraday cup early in the mission (1994-1997), while later in the mission (1998 and onward), depending on the state of the instrument, there will be times when the derived electron density may be as much as a factor 2 too low. Although the electron density is not derived absolutely, relative changes in electron density can be relied on. Both the electron density and electron flow speed track with variations in the ion density and ion flow speed, respectively. However, the user is strongly advised to use the SWE ion key parameters for the bulk plasma density and flow speed. Please acknowledge the Wind/SWE electron instrument team and NASA/GSFC. Ogilvie, Keith W.; Kasper, Justin C.; Stevens, Michael L.; & Fitzenreiter, Richard J. 2021-01-01T00:00:00 NASA Space Physics Data Facility spase://SMWG/Person/Keith.W.Ogilvie PrincipalInvestigator Wind/SWE Description https://wind.nasa.gov/swe/index.html Wind/SWE (Solar Wind Experiment) electron instruments, history and data products spase://VHO/NumericalData/Wind/SWE/H0_PT06S spase://VSPO/NumericalData/Wind/SWE/H0/PT06S spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb Online Open FTPS from SPDF (not with most browsers) ftps://spdf.gsfc.nasa.gov/pub/data/wind/swe/swe_h0/ Repository of the Wind/SWE H0 electron data. HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/wind/swe/swe_h0/ In CDF via HTTP from SPDF CDAWeb https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=WI_H0_SWE&index=sp_phys WI_H0_SWE CDF Please acknowledge the CDAWeb team and NASA/GSFC's NSSDC. spase://SMWG/Repository/NASA/GSFC/SPDF Online Open CDAWeb HAPI Server https://cdaweb.gsfc.nasa.gov/hapi WI_H0_SWE Web Service to this product using the HAPI interface. CSV Please acknowledge the CDAWeb team and NASA/GSFC's NSSDC. WI_H0_SWE v01 spase://SMWG/Instrument/Wind/SWE ThermalPlasma 1994-12-29T00:00:02.409Z 2001-05-31T23:59:57.381Z PT06S PT03S Heliosphere.NearEarth Heliosphere.Inner Earth.Magnetosheath Earth.Magnetosphere.Magnetotail Solar Wind Plasma Time Epoch Timestamp marks beginning of a measurement interval. Measurements are from observations over one spin periods, totaling approx 3 sec, but read out about 6-12 sec, depending on real-time telemetery throughput. CDF_Epoch 01-Jan-1990 00:00:00.000 31-Dec-2029 23:59:59.999 31-Dec-9999 23:59:59.999 Temporal Electron Temperature Te Electron temperature, Te. Te = (trace of pressure tensor)/(electron density * Boltzman constant)/3 = (2*Te_perp + Te_para)/3 K 10000.0 1.0E+06 -1.0E31 Electron Total Temperature Electron Temperature Anisotropy Te_anisotropy Electron temperature anisotropy (Te_Para/Te_Perp). Te_perp = average of the perpendicular elements of the temperature tensor. Te_para = parallel component of the temperature tensor. unitless 0.5 2.0 -1.0E31 Electron Anisotropy Temperature Electron Thermal Energy, Average average_energy Average electron thermal energy = (3/2)Boltzmann constant * Te eV 0.0 75.0 -1.0E31 Electron Average Energy Principle axis of pressure tensor - unit vector pa_press_tensor Principle axis of pressure tensor - unit vector Cartesian GSE 3 pa_press_tensor_x Component.I 1 pa_press_tensor_y Component.J 2 pa_press_tensor_z Component.K 3 -1.0 1.0 -1.0E31 Vector Other Pressure tensor PA dot B unit vector pa_dot_B Pressure tensor principle axis dot magnetic field unit vector -1.0 1.0 -1.0E31 Other Electron Heat flux magnitude heat_flux_magn Electron heat flux magnitude ergs/(cm^2 s) Spherical GSE 0.001 0.03 -1.0E31 Electron Magnitude HeatFlux Heat flux elevation heat_flux_el Electron heat flux elevation degrees Spherical GSE -90.0 90.0 -1.0E31 Electron DirectionAngle.ElevationAngle HeatFlux Heat flux azimuth heat_flux_az Electron heat flux azimuth degrees Spherical GSE 0.0 360.0 -1.0E31 Electron DirectionAngle.AzimuthAngle HeatFlux Heat flux dot B unit vector Q_dot_B Heat flux dot B unit vector -1.0 1.0 -1.0E31 Other Electron Spacecraft Position (GSE) sc_position Spacecraft Position (GSE) Re Cartesian GSE 3 SC_X_GSE Component.I 1 SC_Y_GSE Component.J 2 SC_Z_GSE Component.K 3 -220.0 220.0 -1.0E31 Vector Positional el_bulk_vel_magnitude el_bulk_vel_magn Electron bulk velocity - magnitude See the global product description. km/s Spherical GSE 200.0 1000.0 -1.0E31 Electron Magnitude FlowVelocity el_bulk_vel_elevation el_bulk_vel_el Electron bulk velocity - elevation See the global product description. degrees Spherical GSE -90.0 90.0 -1.0E31 Electron DirectionAngle.ElevationAngle FlowVelocity el_bulk_vel_azimuth el_bulk_vel_az Electron bulk velocity - azimuth See the global product description. degrees Spherical GSE 0.0 360.0 -1.0E31 Electron DirectionAngle.AzimuthAngle FlowVelocity Electron density el_density Electron density See the global product description. /cc 0.1 100.0 -1.0E31 Electron NumberDensity Spacecraft Potential sc_pot Spacecraft Potential Forst-order estimate only; see the global product description. Volts 0.0 20.0 -1.0E31 Other Quality Flag yet to be defined flag Quality Flag, yet to be defined 0 9 -32768 Other major_frame_record _number major_fr_rec major frame record number 0 1900 -2147483648 Other major_frame_spin_number major_fr_spin_number Major frame spin number 0 7 -2147483648 Other