与跨极弧畸变背侧端形成有关的电离层等离子体流
Ionospheric Plasma Flows Associated with the Formation of the Distorted Nightside End of A Transpolar Arc
摘要：
我们调查电离层流动模式发生在2002年1月28日与发展的夜侧扭曲结束的J形transpolar弧（夜侧扭曲TPA）。本文根据SuperDARN（Super Dual Auroral Radar Network）雷达探测到的TPA附近的电离层夜侧流场，讨论了夜侧流场向午夜前扇区的畸变是如何产生的。J形TPA是在向南的行星际磁场（IMF）条件下观察到的，在存在一个占主导地位的朝晨IMF-By分量。在夜侧扭曲TPA的起始时刻，在午夜后的扇区中观察到TPA生长点处的特定的向赤道等离子体流，流出极冠，然后沿着TPA的扭曲夜侧部分转向主极光卵的午夜前扇区。我们认为，这些等离子体流发挥了关键作用，导致夜面失真的TPA。SuperDARN还发现，在TPA间隔之前和期间，在夜侧主极光卵上的IMF北向非亚暴间隔（TRINNI）期间，电离层流动通常与尾重联有关，这表明夜侧磁重联是形成夜侧扭曲TPA的一个不可或缺的过程。在TPA增长期间，SuperDARN还检测到在向阳面上的开放-闭合场线边界上的反向阳流，这表明发生了低纬度向阳面重连和正在进行的邓吉循环驱动。这表明，即使在邓吉循环驱动的等离子体流动模式中，夜面扭曲的TPA也可以生长。
英文摘要：
We investigate ionospheric flow patterns occurring on 28 January 2002 associated with the development of the nightside distorted end of a J-shaped transpolar arc (nightside distorted TPA). Based on the nightside ionospheric flows near to the TPA, detected by the SuperDARN (Super Dual Auroral Radar Network) radars, we discuss how the distortion of the nightside end toward the pre-midnight sector is produced. The J-shaped TPA was seen under southward Interplanetary Magnetic Field (IMF) conditions, in the presence of a dominant dawnward IMF-By component. At the onset time of the nightside distorted TPA, particular equatorward plasma flows at the TPA growth point were observed in the post-midnight sector, flowing out of the polar cap and then turning toward the pre-midnight sector of the main auroral oval along the distorted nightside part of the TPA. We suggest that these plasma flows play a key role in causing the nightside distortion of the TPA. SuperDARN also found ionospheric flows typically associated with Tail Reconnection during IMF Northward Non-substorm Intervals (TRINNIs) on the nightside main auroral oval, before and during the TPA interval, indicating that nightside magnetic reconnection is an integral process to the formation of the nightside distorted TPA. During the TPA growth, SuperDARN also detected anti-sunward flows across the open-closed field line boundary on the dayside that indicate the occurrence of low-latitude dayside reconnection and ongoing Dungey cycle driving. This suggests that nightside distorted TPA can grow even in Dungey-cycle-driven plasma flow patterns.
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