Intense dayside Joule heating during the 5 April 2010 geomagnetic storm recovery phase observed by AMIE and AMPERE
Intense dayside Joule heating during the 5 April 2010 geomagnetic storm recovery phase observed by AMIE and AMPERE
复制标题
AMIE 和 AMPERE 观测到 2010 年 4 月 5 日地磁暴恢复阶段的日照强烈焦耳加热
DOI：
10.1029/2011ja017262
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发表时间：
2012
影响因子：
--
通讯作者：
A. Richmond
中科院分区：
文献类型：
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作者：
F. Wilder;G. Crowley;B. Anderson;A. Richmond
[1] 当行星际磁场 (IMF) 向北、黎明或黄昏时，IMF 和地磁场之间的磁合并发生在磁层尖点附近。虽然这些时期通常被认为是“安静”的，但它们可能会导致强烈的、高度局部化的能量沉积到日侧电离层中。我们在 2010 年 4 月 5 日的一系列两次地磁风暴期间发现了这种情况。首次使用来自活动磁层和行星电动力学响应实验 (AMPERE) 的数据作为电离层电动力学同化绘图 (AMIE) 算法的输入，我们表明在第一次风暴的恢复阶段，在白天的极地区域存在强烈的电离层焦耳加热。这与正午子午线附近的强烈场对准电流对相关，该电流对与北向 IMF 和强 IMF By 分量相关。 AMIE 输出用于驱动热层-电离层-中间层电动力学大气环流模型，以证明焦耳加热的强烈水平可能导致异常热层密度增强和行进扰动。
[1] When the interplanetary magnetic field (IMF) is northward, dawnward, or duskward, magnetic merging between the IMF and the geomagnetic field occurs near the cusp of the magnetosphere. While these periods are usually considered “quiet,” they can lead to intense, but highly localized, energy deposition into the dayside ionosphere. We identify such an occurrence during a series of two geomagnetic storms on 5 April 2010. Using data from the Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE) for the first time as an input to the Assimilative Mapping of Ionospheric Electrodynamics (AMIE) algorithm, we show that during the recovery phase of the first storm there is intense ionospheric Joule heating in the dayside polar regions. This is associated with an intense field-aligned current pair near the noon meridian that is associated with northward IMF and a strong IMF By component. AMIE outputs are used to drive the thermosphere-ionosphere-mesosphere electrodynamics general circulation model to demonstrate that the intense levels of Joule heating can lead to anomalous thermospheric density enhancements and traveling disturbances.