Definition of the Cusp
Definition of the Cusp
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DOI：
10.1007/978-94-009-5295-9_28
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
W. Heikkila
中科院分区：
文献类型：
--
作者：
W. Heikkila
从查普曼和费拉罗、阿克斯福德和海因斯以及邓吉的工作开始，简要回顾了向阳面或极地尖点的历史。太阳风等离子体从尖点向下到达低海拔;这种穿透发生的非常广泛的区域促使使用术语裂缝，显然是在磁层顶内的入口层脚下。讲习班讨论的共识是，尖点应主要指磁剖面中的狭窄特征。裂缝是指由太阳风等离子体定义的更广泛的区域（可能会受到加速或延迟过程的影响）;在电离层或地面上可观察到的独特特征是光电发射，增强的等离子体密度和温度，等离子体对流，电磁波和湍流。
The history of the dayside or polar cusp is reviewed briefly, beginning with the work of Chapman and Ferraro, Axford and Hines, and Dungey. Solar wind plasma comes down the cusp to low altitudes; the remarkably broad area over which this penetration occurs prompted the use of the term cleft, apparently at the foot of the entry layer inside the magnetopause. The consensus of discussion at the workshop was that cusp should refer mainly to the narrow feature in the magnetic profile. Cleft would refer to the broader region defined by the solar wind plasma (perhaps somewhat modified by acceleration or retardation processes); distinctive features observable in the ionosphere or on the ground are photo-emission, enhanced plasma density and temperature, plasma convection, electromagnetic waves, and turbulence.