Geomagnetic and Solar Dependency of MSTIDs Occurrence Rate: A Climatology Based on Airglow Observations From the Arecibo Observatory ROF
Geomagnetic and Solar Dependency of MSTIDs Occurrence Rate: A Climatology Based on Airglow Observations From the Arecibo Observatory ROF
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DOI：
10.1029/2019ja027770
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发表时间：
2020-07
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影响因子：
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通讯作者：
P. Terra;F. Vargas;C. Brum;E. Miller
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作者：
P. Terra;F. Vargas;C. Brum;E. Miller
我们在这项工作中使用了第一个O(1D) 630.0 nm气辉光数据集，该数据集是在波多黎各库莱布拉的远程光学设施（ROF）在太阳周期#24的下降阶段注册的。从2015年11月4日到2019年9月26日，在ROF使用小型全天成像仪进行了633个夜晚的观测，而在499个被归类为晴朗的夜晚中，有225个夜晚被确定为MSTID事件。定量分析这些mstid及其与地球物理参数（太阳活动和地磁活动）的相关性是本研究的重点。我们引入了一种原始的统计方法，该方法检查了数据集的独特特征，并最大限度地减少了单个调制器相互之间的交叉污染，避免了结果中的偏差。我们的发现包括mstid发生的主要高峰在12月至日，次高峰在6月至日。我们观察到mstid的发生率与地磁活动有显著的相关性。mstid的发生率随太阳活动的变化也有显著的变化，包括随季节的相关期和反相关期。这种调制的年分量分别比半年和三年分量强33%和83%。我们根据阿雷西博天文台Fabry - Perot干涉仪30年的观测结果对热层中性风进行了研究，并对这些发现进行了讨论。我们的研究结果适用于低到中等太阳活动，指出了可能解释夜间mstid的先前气候学研究差异的情况。
We employ in this work the first O(1D) 630.0‐nm airglow data set registered at the Remote Optical Facility (ROF) in Culebra, Puerto Rico, during the descending phase of the solar cycle #24. From 4 November 2015 to 26 September 2019, observations were carried out during 633 nights at ROF using a small all‐sky imager, while MSTID events were identified in 225 of 499 nights classified as clear. A quantitative analysis of these MSTIDs and their dependency by geophysical parameters (solar and geomagnetic activities) are the main focus of this study. We introduce an original statistical methodology that examines the unique features of the data set and minimizes the cross contamination of individual modulators onto one another, avoiding bias in the results. Our findings include a primary peak of MSTIDs occurrence in the December solstice and a secondary peak in the June solstice. We observed a remarkable correlation in the occurrence rate of the MSTIDs with the geomagnetic activity. A notable modulation of the MSTIDs occurrence rate with the solar activity is also found, which includes periods of correlation and anticorrelation depending on the season. This modulation has an annual component that is ~33% and ~83% stronger than the semiannual and terannual components, respectively. We discuss these findings based on a previous study of the thermospheric neutral winds derived from 30 years of Fabry‐Perot interferometer observations at Arecibo Observatory. Our results, which are valid for low to moderate solar activity, point out circumstances that might explain differences in previous climatological studies of nighttime MSTIDs.