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

被引：42

作者：

Bercic, Laura ^{[1
,2
]}

Larson, Davin ^{[3
]}

Whittlesey, Phyllis ^{[3
]}

Maksimovic, Milan ^{[1
]}

Badman, Samuel T. ^{[3
]}

Landi, Simone ^{[2
,4
]}

Matteini, Lorenzo ^{[1
]}

Bale, Stuart D. ^{[3
,5
,6
,7
]}

Bonnell, John W. ^{[5
]}

Case, Anthony W. ^{[8
]}

de Wit, Thierry Dudok ^{[9
,10
]}

Goetz, Keith ^{[11
]}

Harvey, Peter R. ^{[5
]}

Kasper, Justin C. ^{[8
,12
]}

Korreck, Kelly E. ^{[8
]}

Livi, Roberto ^{[3
]}

MacDowall, Robert J. ^{[13
]}

Malaspina, David M. ^{[14
]}

Pulupa, Marc ^{[5
]}

Stevens, Michael L. ^{[8
]}

机构：

[1] Univ Paris Diderot, UPMC Univ Paris 6, PSL Res Univ, CNRS,Observ Paris,LESIA, Meudon, France

[2] Univ Florence, Phys & Astron Dept, Sesto Fiorentino, Italy

[3] Univ Calif Berkeley, Phys Dept, Berkeley, CA 94720 USA

[4] INAF, Osservatorio Astrofis Arcetri, Florence, Italy

[5] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[6] Imperial Coll London, Blackett Lab, London SW7 2AZ, England

[7] Queen Mary Univ London, Sch Phys & Astron, London E1 4NS, England

[8] Smithsonian Astrophys Observ, Cambridge, MA USA

[9] CNRS, LPC2E, Orleans, France

[10] Univ Orleans, Orleans, France

[11] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

[12] Univ Michigan, Ann Arbor, MI 48109 USA

[13] NASA, Goddard Space Flight Ctr, Solar Syst Explorat Div, Greenbelt, MD 20771 USA

[14] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA

来源：

ASTROPHYSICAL JOURNAL | 2020年 / 892卷 / 02期

关键词：

Solar wind; Solar physics; Space plasmas; Space vehicle instruments; Astronomy data analysis; Solar corona; Solar atmosphere; RADIAL EVOLUTION; HEAT-FLUX; WIND; VELOCITY; MODEL; DISTRIBUTIONS; SPEED; PROTONS; ENERGY; SLOW;

D O I：

10.3847/1538-4357/ab7b7a

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 ( <CDATA <i ). Most of the strahl measured by PSP appear narrow with PAW reaching down to 30 degrees. The portion of the strahl velocity distribution function aligned with the magnetic field is for the measured energy range well described by a Maxwellian distribution function. T-s parallel to was found to be anticorrelated with the solar wind velocity and independent of radial distance. These observations imply that T-s parallel to carries the information about the coronal electron temperature. The obtained values are in agreement with coronal temperatures measured using spectroscopy, and the inferred solar wind source regions during the first orbit of PSP agree with the predictions using a PFSS model.

引用

页数：14

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