Electron Energy Partition across Interplanetary Shocks. II. Statistics

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http://hdl.handle.net/10138/313947

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Wilson , L B , Chen , L-J , Wang , S , Schwartz , S J , Turner , D L , Stevens , M L , Kasper , J C , Osmane , A , Caprioli , D , Bale , S D , Pulupa , M P , Salem , C S & Goodrich , K A 2019 , ' Electron Energy Partition across Interplanetary Shocks. II. Statistics ' , Astrophysical Journal Supplement Series , vol. 245 , no. 2 , 24 . https://doi.org/10.3847/1538-4365/ab5445

Title: Electron Energy Partition across Interplanetary Shocks. II. Statistics
Author: Wilson, Lynn B.; Chen, Li-Jen; Wang, Shan; Schwartz, Steven J.; Turner, Drew L.; Stevens, Michael L.; Kasper, Justin C.; Osmane, Adnane; Caprioli, Damiano; Bale, Stuart D.; Pulupa, Marc P.; Salem, Chadi S.; Goodrich, Katherine A.
Contributor: University of Helsinki, Department of Physics
Date: 2019-12
Language: eng
Number of pages: 29
Belongs to series: Astrophysical Journal Supplement Series
ISSN: 0067-0049
URI: http://hdl.handle.net/10138/313947
Abstract: A statistical analysis of 15,210 electron velocity distribution function (VDF) fits, observed within +/- 2 hr 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. Given the large statistics in this investigation, the beam/strahl fit results in the upstream are now the most comprehensive attempt to parameterize the beam/strahl electron velocity moments in the ambient solar wind. 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]) similar to 11.3(0.36)[0.17] cm(-3), T-ec(h)[b],T-tot similar to 14.6(48.4)[40.2] eV, beta(ec(h)[b],tot) similar to 0.93(0.11)[0.05], and Alpha(ec(h)[b]) similar to 0.98(1.03)[0.93]. This work will also serve as a 1 au baseline and reference for missions like Parker Solar Probe and Solar Orbiter.
Subject: PHASE-SPACE SIGNATURES
WIND ION MEASUREMENTS
HEAT-FLUX DROPOUTS
LOW-MACH-NUMBER
SOLAR-WIND
VELOCITY DISTRIBUTIONS
DRIFT ACCELERATION
SUPRATHERMAL ELECTRONS
TRANSPORT-EQUATIONS
RADIAL EVOLUTION
115 Astronomy, Space science
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