Electron energy partition across interplanetary shocks: II. Statistics

Abstract

A statistical analysis of 15,210 electron velocity distribution function (VDF) fits, observed within $\pm$2 hours of 52 interplanetary (IP) shocks by the $Wind$ spacecraft near 1 AU, is presented. This is the second in a three-part series on electron VDFs near IP shocks. The electron velocity moment statistics for the dense, low energy core, tenuous, hot halo, and field-aligned beam/strahl are a statistically significant list of values illustrated with both histograms and tabular lists for reference and baselines in future work. The beam/strahl fit results in the upstream are currently the closest thing to a proper parameterization of the beam/strahl electron velocity moments in the ambient solar wind. This work will also serve as a 1 AU baseline and reference for missions like $ParkerSolarProbe$ and $SolarOrbiter$. The median density, temperature, beta, and temperature anisotropy values for the core(halo)[beam/strahl] components, with subscripts $ec$($eh$)[$eb$], of all fit results respectively are $n{}_{ec(h)[b]}$ $\sim$ 11.3(0.36)[0.17] $c{m}^{-3}$, $T{}_{ec(h)[b],tot}$ $\sim$ 14.6(48.4)[40.2] $eV$, $\beta {}_{ec(h)[b],tot}$ $\sim$ 0.93(0.11)[0.05], and $\mathcal{A}{}_{ec(h)[b]}$ $\sim$ 0.98(1.03)[0.93]. The nuanced details of the fitting method and data product description were published in Paper I and the detailed analysis of the results will be shown in Paper III.

40 pages, 11 figures, 18 tables, to be submitted to Astrophys. J. Suppl

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Cited by in corpus (19)

• Proton Temperature Anisotropy Variations in Inner Heliosphere Estimated with First Parker Solar Probe Observations
• Coronal Electron Temperature inferred from the Strahl Electrons in the Inner Heliosphere: Parker Solar Probe and Helios observations
• Alternative high plasma beta regimes of electron heat-flux instabilities in the solar wind
• Precision Electron Measurements in the Solar Wind at 1 au from NASA's Wind Spacecraft
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• General dispersion properties of magnetized plasmas with drifting bi-Kappa distributions. DIS-K: DIspersion Solver for Kappa plasmas
• On quasi-parallel whistler waves in the solar wind
• Narrowband oblique whistler-mode waves: Comparing properties observed by Parker Solar Probe at <0.2 AU and STEREO at 1 AU
• Electron energy partition across interplanetary shocks: III. Analysis
• A Quasi-Linear Diffusion Model for Resonant Wave-Particle Instability in Homogeneous Plasma
• Modeling interactions of narrowband large amplitude whistler-mode waves with electrons in the solar wind inside ~.3 AU and at 1 AU using a particle tracing code
• Electromagnetic Ion-Ion Instabilities in Space Plasmas: Effects of Suprathermal Populations
• Generalized anisotropic $\kappa$-cookbook: 2D fitting of Ulysses electron data
• Electron Heat Flux in the Solar Wind: Generalized Approaches to Fluid Transport with a Variety of Skewed Velocity Distributions
• Temperature anisotropy instabilities of solar wind electrons with regularized Kappa-halos resolved with ALPS
• Particle-In-Cell Simulations of Sunward and Anti-sunward Whistler Waves in the Solar Wind
• Heat-flux Instabilities of Regularized Kappa Distributed Strahl Electrons Resolved with ALPS
• Revisiting the Ulysses electron data with a triple fit of velocity distributions
• The structure of cluster merger shocks: turbulent width and the electron heating timescale