A statistical study of the dawn-dusk asymmetry of ion temperature anisotropy and mirror mode occurrence in the terrestrial daysidemagnetosheath using THEMIS data

A. P. Dimmock; A. Osmane; T. I. PulkkinenK. Nykyri

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A statistical study of the dawn-dusk asymmetry of ion temperature anisotropy and mirror mode occurrence in the terrestrial daysidemagnetosheath using THEMIS data

机译：统计研究dawn-dusk不对称的离子温度各向异性和镜像模式发生在陆地忒弥斯daysidemagnetosheath使用数据

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摘要

We present a statistical study of ion temperature anisotropy and mirror mode activity in the Earth's dayside magnetosheath using 6 years of Time History of Events and Macroscale Interactions during Substorms (THEMIS) observations focusing on the quantification of dawn-dusk asymmetry as a function of upstream conditions and distance from the magnetopause. Our statistical data show a pronounced dusk favored asymmetry of T_⊥∕T_‖ which drives a similar asymmetry of mirror mode activity. T_⊥∕T_‖ decreases with increasing solar wind Alfvén Mach number, whereas mirror mode occurrence increases. In both cases, the relative asymmetry between the dawn and dusk flanks decrease with increasing Alfvén Mach number. In addition, during the transition from low/moderate M_A, there was a shift in our data set from dips to peaks, suggesting that the magnetosheath strongly favors peaks during intervals of higher Mach number. We also observed more mirror modes and larger asymmetry during atypical inward ortho-Parker spiral interplanetary magnetic field compared to the more statistically relevant Parker spiral configuration. Our results are consistent with previous experimental studies of mirror modes and to some extent, numerical models.

机译：我们提出一个统计研究离子温度各向异性和镜像模式的活动使用6年的地球的光面磁鞘时间的历史事件和宏观尺度互动,在亚暴(裁判)观察的量化dawn-dusk不对称作为上游的函数条件和磁层的距离。我们的统计数据显示明显的黄昏理想不对称T_⊥识别∕T_为识别驱动类似的不对称的镜像模式的活动。T_⊥识别∕T_为识别随太阳风增加而减小阿尔芬马赫数,而镜像模式出现增加。黎明和黄昏两翼之间的不对称减少与阿尔芬马赫数增加。在转换过程中,从低/温和M_A,我们的数据集从下降的转变峰,这表明磁鞘强烈支持更高的山峰在间隔马赫数。和更大的不对称在典型的内向ortho-Parker螺旋行星际磁场相比更多的统计相关帕克螺旋配置。与以前的实验研究一致镜像模式从某种程度上来说,数值模型。

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来源
《Journal of Geophysical Research, A. Space Physics: JGR》 |2015年第7期|5489-5503|共15页
作者
A. P. Dimmock; A. Osmane; T. I. PulkkinenK. Nykyri;
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作者单位

School of Electrical Engineering, Aalto University, Espoo, Finland;

Department of Physical Sciences, Embry-Riddle Aeronautical University, Daytona Beach, Florida, USA;

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正文语种英语
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Statistical Study; Mirrors; Ion temperaturetime history;

机译：统计研究;镜子;离子temperaturetime历史;

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A statistical study of the dawn-dusk asymmetry of ion temperature anisotropy and mirror mode occurrence in the terrestrial daysidemagnetosheath using THEMIS data

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