Global ena Image Simulations
Global ena Image Simulations
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DOI：
10.1007/978-94-010-0027-7_5
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发表时间：
2003-10
影响因子：
10.3
通讯作者：
M. Fok;T. Moore;G. Wilson;J. Perez;X. X. Zhang-X.;P. Brandt;D. Mitchell;E. Roelof;J. Jahn;C. Pollock;R. Wolf
中科院分区：
文献类型：
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作者：
M. Fok;T. Moore;G. Wilson;J. Perez;X. X. Zhang-X.;P. Brandt;D. Mitchell;E. Roelof;J. Jahn;C. Pollock;R. Wolf
ISEE和POLAR卫星获得的高能中性原子图像为磁层等离子体的全球成像指明了方向。极光全球探测磁暂停成像仪（IMAGE）是第一个专门使用多个中性原子成像仪的使命：HENA，MENA和LENA，分别监测高能，中能和低能范围的离子分布。自科学运行开始以来，HENA，MENA和LENA一直在不断发送高压太阳风的环电流，电离层外流和磁鞘增强的图像。从二维图像中展开多维（等于或大于3）等离子体分布不是一项简单的任务。与模拟的ENA图像从一个建模的离子分布的比较提供了一个重要的基础，在观察到的图像中的功能的解释。另一种方法是开发图像反演方法来从ENA图像中提取离子信息。模拟研究成功地再现和解释了高能离子漂移动力学，从开放到封闭的漂移路径的过渡，以及磁鞘对极端太阳风条件的响应。另一方面，HENA观察到了黎明前夜面的风暴时间离子增强，这与简单的概念不同，但可以用更复杂的模型来解释。LENA图像从近地点通行证揭示了意想不到的特点，现在可以解释为一个短暂的超热外逸层组成部分，是重力的影响，如果没有绑定的证据。在本文中，我们将报告在几个IMAGE观测事件期间进行的ENA模拟。这些模拟提供了洞察力和解释的ENA功能，不容易理解以前。
The energetic neutral atom (ENA) images obtained by the ISEE and POLAR satellites pointed the way toward global imaging of the magnetospheric plasmas. The Imager for Magneto-pause to Aurora Global Exploration (IMAGE) is the first mission to dedicate multiple neutral atom imagers: HENA, MENA and LENA, to monitor the ion distributions in high-, medium- and low-energy ranges, respectively. Since the start of science operation, HENA, MENA and LENA have been continuously sending down images of the ring current, ionospheric outflow, and magnetosheath enhancements from high pressure solar wind. To unfold multiple-dimensional (equal or greater than 3) plasma distributions from 2-dimensional images is not a trivial task. Comparison with simulated ENA images from a modeled ion distribution provides an important basis for interpretation of features in the observed images. Another approach is to develop image inversion methods to extract ion information from ENA images. Simulation studies have successfully reproduced and explained energetic ion drift dynamics, the transition from open to closed drift paths, and the magnetosheath response to extreme solar wind conditions. On the other hand, HENA has observed storm-time ion enhancement on the nightside toward dawn that differs from simple concepts but can be explained using more sophisticated models. LENA images from perigee passes reveal unexpected characteristics that now can be interpreted as evidence for a transient superthermal exospheric component that is gravitationally-influenced if not bound. In this paper, we will report ENA simulations performed during several IMAGE observed events. These simulations provide insight and explanations to the ENA features that were not readily understandable previously.