The shape of the electron velocity distribution function plays an important role in the dynamics of the solar wind acceleration. Electrons are normally modeled with three components, the core, the halo, and the strahl. We investigate how well the fast strahl electrons in the inner heliosphere preserve the information about the coronal electron temperature at their origin. We analyzed the data obtained by two missions, Helios, spanning the distances between 65 and 215 R-S, and Parker Solar Probe (PSP), reaching down to 35 R-S during its first two orbits around the Sun. The electron strahl was characterized with two parameters: pitch-angle width (PAW) and the strahl parallel temperature (T-s parallel to). PSP observations confirm the already reported dependence of strahl PAW on core parallel plasma beta (

Coronal Electron Temperature Inferred from the Strahl Electrons in the Inner Heliosphere: Parker Solar Probe and Helios Observations / Berčič, Laura; Larson, Davin; Whittlesey, Phyllis; Maksimović, Milan; Badman, Samuel T.; Landi, Simone; Matteini, Lorenzo; Bale, Stuart. D.; Bonnell, John W.; Case, Anthony W.; Dudok de Wit, Thierry; Goetz, Keith; Harvey, Peter R.; Kasper, Justin C.; Korreck, Kelly E.; Livi, Roberto; MacDowall, Robert J.; Malaspina, David M.; Pulupa, Marc; Stevens, Michael L.. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 1538-4357. - ELETTRONICO. - 892:(2020), pp. 0-0. [10.3847/1538-4357/ab7b7a]

Coronal Electron Temperature Inferred from the Strahl Electrons in the Inner Heliosphere: Parker Solar Probe and Helios Observations

Berčič, Laura
Writing – Original Draft Preparation
;
Landi, Simone
Supervision
;
2020

Abstract

The shape of the electron velocity distribution function plays an important role in the dynamics of the solar wind acceleration. Electrons are normally modeled with three components, the core, the halo, and the strahl. We investigate how well the fast strahl electrons in the inner heliosphere preserve the information about the coronal electron temperature at their origin. We analyzed the data obtained by two missions, Helios, spanning the distances between 65 and 215 R-S, and Parker Solar Probe (PSP), reaching down to 35 R-S during its first two orbits around the Sun. The electron strahl was characterized with two parameters: pitch-angle width (PAW) and the strahl parallel temperature (T-s parallel to). PSP observations confirm the already reported dependence of strahl PAW on core parallel plasma beta (
2020
892
0
0
Berčič, Laura; Larson, Davin; Whittlesey, Phyllis; Maksimović, Milan; Badman, Samuel T.; Landi, Simone; Matteini, Lorenzo; Bale, Stuart. D.; Bonnell, ...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1189597
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