On Mechanisms of Proton Perpendicular Heating in the Solar Wind: Test Results Based on Wind Observations
On Mechanisms of Proton Perpendicular Heating in the Solar Wind: Test Results Based on Wind Observations
复制标题
太阳风中质子垂直加热机制：基于风观测的测试结果
DOI：
10.1088/1674-4527/ac3413
复制
发表时间：
2021-10
影响因子：
1.8
通讯作者：
Tian Zhanjun
中科院分区：
文献类型：
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作者：
Zhao Guoqing;Feng Hengqiang;Wu Dejin;Liu Qiang;Zhao Yan;Tian Zhanjun
太阳风质子在行星际空间传播时会受到显著的垂直加热。动力学Alfven波引起的随机加热和回旋共振加热本文利用2004年6月和2019年5月的风场观测资料对两种机制进行了检验，结果表明，在2004年6月和2019年5月的风场观测资料中，随机加热理论的各项参数对等离子体参数β有很大的依赖性，对于中等高β的太阳风，理论加热率与经验加热率相当或大于经验加热率，表明随机加热可能是一种强有力的机制;而对于低β的太阳风，大部分数据的理论加热率远低于经验加热率，另一方面，当KAWs的传播角在70°左右时，理论上预测的KAWs的阻尼波数与观测到的磁能谱变得明显陡峭的波数相等，这可能意味着由于KAWs的回旋阻尼引起的共振加热可能是另一个原因。如果KAWs的传播角约为70°，
The solar wind protons undergo significant perpendicular heating when they propagate in the interplanetary space.Stochastic heating and cyclotron resonance heating due to kinetic Alfven waves(KAWs)are two proposed mechanisms.Which mechanism accounts for the perpendicular heating is still an open question.This paper performs tests for the two mechanisms based on Wind observations during 2004 June and 2019 May.Results show that heating rates in terms of stochastic heating theory considerably depend on the parameter of plasma β.For the solar wind with moderately high β,the theoretical heating rates are comparable to or larger than empirical heating rates,suggesting that the stochastic heating could be a powerful mechanism.For the solar wind with low β,on the contrary,the majority of data have theoretical heating rates much lower than empirical heating rates,showing that the stochastic heating seems to be weak in this case.On the other hand,it is found that,when the propagation angles of KAWs are around 70°,theoretically predicted damping wavenumbers of KAWs are equal to the observed wavenumbers at which magnetic energy spectra become significantly steep.This may imply that resonance heating due to cyclotron damping of KAWs could be another mechanism if KAWs have propagation angles around 70°.
DOI：
10.1007/978-981-13-7989-5
发表时间：
2020
期刊：
Kinetic Alfvén Waves in Laboratory, Space, and Astrophysical Plasmas
影响因子：
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作者：
Dejin Wu;Ling Chen
通讯作者：
Dejin Wu;Ling Chen