Fine-Scale Electric Fields and Joule Heating From Observations of the Aurora
Fine-Scale Electric Fields and Joule Heating From Observations of the Aurora
复制标题
极光观测中的精细电场和焦耳热
DOI：
10.1029/2022ja030628
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Krcelic P
中科院分区：
文献类型：
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作者：
Krcelic P
来自三个选定波长的光学测量与极光事件发射的建模相结合，以估计极光弧两侧小尺度电场的大小和方向。的时间分辨率的估计是0.1秒，这是高得多的分辨率比测量从超级双极光雷达网络（SuperDARN）在同一地区，我们比较我们的估计。此外，我们还使用扫描多普勒成像仪测量事件期间的中性风，以计算高度积分焦耳加热。从小规模电场中获得的焦耳热值（电弧每侧平均为17 ± 11和6 ± 9 mWm− 2）大于从更传统的SuperDARN数据中获得的焦耳热值（5 mWm−2）。这一结果意义重大，因为焦耳加热会引起热层热膨胀和热传导的变化，也可能影响中性风的加速。我们的结果表明，高空间和时间分辨率的电场可能在磁层-电离层-热层系统的动力学中起着重要的作用。
Optical measurements from three selected wavelengths have been combined with modeling of emissions from an auroral event to estimate the magnitude and direction of small‐scale electric fields on either side of an auroral arc. The temporal resolution of the estimates is 0.1 s, which is much higher resolution than measurements from Super Dual Auroral Radar Network (SuperDARN) in the same region, with which we compare our estimates. Additionally, we have used the Scanning Doppler Imager instrument to measure the neutral wind during the event in order to calculate the height integrated Joule heating. Joule heating obtained from the small scale electric fields gives larger values (17 ± 11 and 6 ± 9 mWm−2on average on each side of the arc) than the Joule heating obtained from more conventionally used SuperDARN data (5 mWm−2). This result is significant, because Joule heating will cause changes in the thermosphere from thermal expansion and thermal conductivity, and may also affect the acceleration of the neutral wind. Our result indicates that high spatial and temporal resolution electric fields may play an important role in the dynamics of the magnetosphere‐ionosphere‐thermosphere system.