arXiv 2202.103452022-02-21astro-ph.SRphysics.plasm-phphysics.space-ph

太阳风中触发离子声波对核心电子的加热

Core Electron Heating By Triggered Ion Acoustic Waves In The Solar Wind

Forrest Mozer, Stuart Bale, Cynthia Cattell, Jasper Halekas, Ivan Vasko, Jae Verniero, Paul Kellogg

备注：: 12 pages, 6 figures. arXiv admin note: substantial text overlap with arXiv:2111.07161
DOI：: 10.3847/2041-8213/ac5520

摘要：

对帕克太阳探测器轨道6 - 9上近日点的研究表明，太阳风核心电子来自15个太阳半径，温度为55 ± 5 eV，与太阳风的速度（300 - 800 km/sec）无关。离开15个太阳半径后，在更远距离没有触发离子声波的情况下，核心电子温度随着径向距离R而变化，在太阳半径内，由于绝热膨胀产生的冷却，核心电子温度为1900 R-4/3电子伏特。系数1900再现了在25天的观测期间观测到的最低核心电子垂直温度。在触发离子声波的存在下，核心电子被各向同性加热，最低温度为1900 R-4/3 eV以上的两倍。触发离子声波是唯一的波观察到的一致的电子核心加热。它们是频率大于100赫兹的主导波模式，太阳距离在15至30个太阳半径之间。

英文摘要：

Perihelion passes on Parker Solar Probe orbits six through nine have been studied to show that solar wind core electrons emerged from 15 solar radii with a temperature of 55 plus or minus 5 eV, independent of the solar wind speed which varied from 300 to 800 km/sec. After leaving 15 solar radii and in the absence of triggered ion acoustic waves at greater distances, the core electron temperature varied with radial distance, R, in solar radii, as 1900R-4/3 electron volts because of cooling produced by the adiabatic expansion. The coefficient, 1900, reproduces the minimum core electron perpendicular temperature observed during the 25 days of observation. In the presence of triggered ion acoustic waves, the core electrons were isotropically heated as much as a factor of two above the minimum temperature, 1900R-4/3 eV. Triggered ion acoustic waves were the only waves observed in coincidence with the electron core heating. They are the dominant wave mode at frequencies greater than 100 Hz at solar distances between 15 and 30 solar radii.

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