Electron Energy Partition across Interplanetary Shocks. II. Statistics

Electron Energy Partition across Interplanetary Shocks. II. StatisticsWilson, Lynn B., IIIChen, Li-JenWang, ShanSchwartz, Steven J.Turner, Drew L.Stevens, Michael L.Kasper, Justin C.Osmane, AdnaneCaprioli, DamianoBale, Stuart D.Pulupa, Marc P.Salem, Chadi S.Goodrich, Katherine A.DOI: info:10.3847/1538-4365/ab5445v. 24524
Wilson, Lynn B., III, 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., and Goodrich, Katherine A. 2019. "Electron Energy Partition across Interplanetary Shocks. II. Statistics." The Astrophysical Journal Supplement Series 245:24. https://doi.org/10.3847/1538-4365/ab5445
ID: 154543
Type: article
Authors: Wilson, Lynn B., III; 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.
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]}∼ 11.3(0.36)[0.17] {cm}}-3, {T}ec(h)[b],{tot}}∼ 14.6(48.4)[40.2] {eV}, {β }ec(h)[b],{tot}}∼ 0.93(0.11)[0.05], and {{ \mathcal A }}ec(h)[b]} ∼ 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.