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Mid-latitude Comparisons of Ion and Neutral Velocity Observations with General Circulation Model Outputs.

crossref(2022)

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Abstract
Modelling of Joule heating is key to understanding the impact of space weather on the neutral atmosphere. One of the most commonly used models in the scientific community is the Thermosphere-Ionosphere Electrodynamics General Circulation Model (TIEGCM). The modelled plasma and neutral wind velocities are key parameters for Joule heating estimates, however there is limited validation of TIEGCM’s performance at mid-latitudes. In this study we use the Blackstone Super Dual Auroral Radar Network (SuperDARN) and the Michigan North American Thermosphere Ionosphere Observing Network (NATION) Fabry-Perot interferometer (FPI) to obtain the local nightside plasma and neutral velocities at ~40 degrees geographic latitude during a 10 hour interval on 15 July 2014 and compare our observations with the outputs from TIEGCM. We find that TIEGCM lacks the variability seen in our observations while overestimating quiet time plasma velocities as well as neutral wind velocities during both quiet and active times compared to our observations. We also find that TIEGCM agrees with the observed neutral wind flow direction but disagrees with the observed plasma flow direction. We note that a better representation of the mid-latitude neutral winds and ion drifts is required in order to improve the accuracy of the modelled Joule heating rate.
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要点】:本研究通过比较中纬度地区离子和中性风速观测值与通用环流模型输出值,发现现有模型在模拟中纬度地区风速方面存在偏差,指出需要更精确的模型来估算焦耳加热率。

方法】:使用Blackstone Super Dual Auroral Radar Network (SuperDARN)和Michigan North American Thermosphere Ionosphere Observing Network (NATION) Fabry-Perot interferometer (FPI)获取中纬度地区局部夜侧等离子体和中性风速。

实验】:在2014年7月15日10小时的时间间隔内进行观测,并将得到的观测数据与TIEGCM模型的输出结果进行比较,发现模型在平静和活动期间高估了等离子体和中性风速,且在等离子体流动方向上与观测值存在差异。