Solar Wind Density and Core Temperature Derived from the PSP Quasi-thermal Noise Measurements

被引：4

作者：

Zheng, Xianming ^{[1
]}

Liu, Kaijun ^{[1
]}

Martinovic, Mihailo M. ^{[2
,3
]}

Pierrard, Viviane ^{[4
,5
]}

Liu, Mingzhe ^{[3
,6
]}

He, Qingbao ^{[1
]}

Cheng, Kun ^{[1
]}

Liu, Yuqi ^{[1
]}

Wang, Yan ^{[1
]}

机构：

[1] Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China

[2] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ USA

[3] LESIA, Observ Paris, Meudon, France

[4] Royal Belgian Inst Space Aeron BIRA IASB, Solar Terr Ctr Excellence, Space Phys, Brussels, Belgium

[5] Catholic Univ Louvain, Earth & Life Inst Climate Sci ELI C, Ctr Space Radiat CSR, Georges Lemaitre Ctr Earth & Climate Res TECLIM, Louvain La Neuve, Belgium

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

来源：

ASTROPHYSICAL JOURNAL | 2024年 / 963卷 / 02期

基金：

中国国家自然科学基金;

关键词：

ELECTRON-TEMPERATURE; SPECTROSCOPY; PLASMA; PROBE;

D O I：

10.3847/1538-4357/ad236d

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Quasi-thermal noise (QTN) spectroscopy is a valuable method to deduce important parameters in space plasma, such as plasma density and temperature, especially when direct particle measurements are not available. The present study develops a new fitting method to fit the QTN spectra observed by the Parker Solar Probe (PSP) with a comprehensive theoretical QTN spectral model. By combining the steepest descent and Levenberg-Marquardt algorithms, the new method is more flexible with initial guess values but still yields reliable solar wind electron density and temperature values. The new method is applied to derive the solar wind density and core temperature from the QTN measurements during 10 encounters of PSP. The electron density and temperature values obtained vary with the radial distance from the Sun as n e proportional to r -2.12 and T e proportional to r -0.71, both of which are consistent with existing models and previous results.

引用

页数：6

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