Sounding rocket study of two sequential auroral poleward boundary intensifications
Sounding rocket study of two sequential auroral poleward boundary intensifications
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两次连续极光向极边界增强的探空火箭研究
DOI：
10.1029/2011ja016428
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发表时间：
2011
影响因子：
--
通讯作者：
H. Stenbaek
中科院分区：
文献类型：
--
作者：
M. Mella;K. Lynch;D. Hampton;H. Dahlgren;P. Kintner;M. Lessard;D. Lummerzheim;E. Lundberg;M. Nicolls;H. Stenbaek
[1]2009年3月20日11：04：00 UT，Cascades-2号探空火箭从阿拉斯加的扑克平原研究靶场发射，飞越了一系列极向边界增强区（PBIs）。火箭最初穿过一个扩散弧，然后穿过一个PBI（流光）的赤道范围，最后在进入极冠之前穿过一个单独的PBI的起点。每个交叉点都有根本不同的电子能量和俯仰角结构，以及不同的可见极光地面光学图像。结果表明，扩散弧具有准静态的加速机制，而向极边界处的强化具有阿尔文加速机制。流光显示出两种类型的加速度的特性。PFISR数据为火箭观测提供了电离层背景。三颗THEMIS卫星与火箭脚点密切配合，显示了与PBI活动现场观测有关的磁尾中的向地流动和轻微的双极化。Cascades-2号研究的一个重要目标是将不同的观测团体（火箭、地面照相机、地面雷达、卫星）汇集在一起进行同一个案例研究。Cascades-2实验是PBI序列的第一次探空火箭观测，能够详细调查PBI序列从Alfvenic演变为准静态结构时各个阶段的电子特征和光学极光。
[1] The Cascades-2 sounding rocket was launched on 20 March 2009 at 11:04:00 UT from the Poker Flat Research Range in Alaska, and flew across a series of poleward boundary intensifications (PBIs). The rocket initially crosses a diffuse arc, then crosses the equatorward extent of one PBI (a streamer), and finally crosses the initiation of a separate PBI before entering the polar cap. Each of the crossings have fundamentally different in situ electron energy and pitch angle structure, and different ground optics images of visible aurora. It is found that the diffuse arc has a quasi-static acceleration mechanism, and the intensification at the poleward boundary has an Alfvenic acceleration mechanism. The streamer shows characteristics of both types of acceleration. PFISR data provide ionospheric context for the rocket observations. Three THEMIS satellites in close conjunction with the rocket foot point show earthward flows and slight dipolarizations in the magnetotail associated with the in situ observations of PBI activity. An important goal of the Cascades-2 study is to bring together the different observational communities (rocket, ground cameras, ground radar, satellite) with the same case study. The Cascades-2 experiment is the first sounding rocket observation of a PBI sequence, enabling a detailed investigation of the electron signatures and optical aurora associated with various stages of a PBI sequence as it evolves from an Alfvenic to a more quasi-static structure.
动力极冠边界附近的 EISCAT 和 Cluster 观测
影响因子：
1.9
作者：
Aikio A
通讯作者：
Aikio A