Thermospheric density enhancements in the dayside cusp region during strong BY conditions
Thermospheric density enhancements in the dayside cusp region during strong BY conditions
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DOI：
10.1029/2009gl042143
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发表时间：
2010-04
影响因子：
5.2
通讯作者：
Geoff Crowley;D. Knipp;K. A. Drake;J. Lei;Eric K. Sutton;H. Lühr
中科院分区：
文献类型：
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作者：
Geoff Crowley;D. Knipp;K. A. Drake;J. Lei;Eric K. Sutton;H. Lühr
来自小卫星有效载荷（CHAMP）卫星的三轴加速度计数据以前所未有的细节揭示了热层密度及其变化。这些数据通常包含位于高纬度尖点扇区的高密度区域。在本文中，我们提供了第一个详细的解释高纬度密度增强观测CHAMP，集中在2005年8月24日的时间间隔。热层电离层中间层电动力学环流模式（TIMEGCM）由电离层电动力学同化映射（AMIE）算法指定的高保真高纬度输入驱动，并再现了密度增强的主要特征。TIMEGCM和AMIE为解释CHAMP密度提供了一个全球框架。我们的模拟表明，在向阳面尖点区域观察到的密度增强是由于在强（+20 nT）BY的间隔期间意外大量的能量进入尖点纬度的电离层-热层系统造成的。
Tri‐axial accelerometer data from the Challenging Minisatellite Payload (CHAMP) satellite have revealed the thermospheric density and its variability in unprecedented detail. The data often contain regions of high density located in the cusp sector at high latitudes. In this paper we provide the first detailed explanation of a high latitude density enhancement observed by CHAMP, focusing on the August 24, 2005 interval. The Thermosphere Ionosphere Mesosphere Electrodynamics General Circulation Model (TIMEGCM) was driven by high‐fidelity high‐latitude inputs specified by the Assimilative Mapping of Ionospheric Electrodynamics (AMIE) algorithm, and reproduced the main features of the density enhancements. The TIMEGCM and AMIE provide a global framework for interpretation of the CHAMP densities. Our simulations reveal that the observed density enhancement in the dayside cusp region resulted from unexpectedly large amounts of energy entering the Ionosphere‐Thermosphere system at cusp latitudes during an interval of strong (+20 nT) BY.