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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Evolution of the Geomagnetic Daily Variation at Tatuoca, Brazil, From 1957 to 2019: A Transition From Sq to EEJ
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Evolution of the Geomagnetic Daily Variation at Tatuoca, Brazil, From 1957 to 2019: A Transition From Sq to EEJ

机译：地磁日变的进化Tatuoca,巴西,从1957年到2019年:一个过渡从平方EEJ

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摘要

The magnetic equator in the Brazilian region has moved over 1,100 km northward since 1957, passing the geomagnetic observatory Tatuoca (TTB), in northern Brazil, around 2013. We recovered and processed TTB hourly mean values of the geomagnetic field horizontal (H) component from 1957 until 2019, allowing the investigation of long‐term changes in the daily variation due to the influence of secular variation, solar activity, season, and lunar phase. The H day‐to‐day variability and the occurrence of the counter electrojet at TTB were also investigated. Until the 1990s, ionospheric solar quiet currents dominated the quiet‐time daily variation at TTB. After 2000, the magnitude of the daily variation became appreciably greater due to the equatorial electrojet (EEJ) contribution. The H seasonal and day‐to‐day variability increased as the magnetic equator approached, but their amplitudes normalized to the average daily variation remained at similar levels. Meanwhile, the amplitude of the lunar variation, normalized in the same way, increased from 5% to 12%. Within the EEJ region, the occurrence rate of the morning counter electrojet (MCEJ) increased with proximity to the magnetic equator, while the afternoon counter electrojet (ACEJ) did not. EEJ currents derived from CHAMP and Swarm satellite data revealed that the MCEJ rate varies with magnetic latitude within the EEJ region while the ACEJ rate is largely constant. Simulations with the Thermosphere‐Ionosphere‐Electrodynamics General Circulation Model based on different geomagnetic main field configurations suggest that long‐term changes in the geomagnetic daily variation at TTB can be attributed to the main field secular variation.
机译：巴西的磁赤道地区自1957年以来,向北移动了超过1100公里地磁观测站Tatuoca (TTB)巴西北部,约2013。加工TTB每小时的平均值地磁场水平(H)组件1957年到2019年,允许的调查长期的日变化的变化长期变化的影响,太阳能活动、季节和月球阶段。天~量变化的发生计数器在TTB电喷流也被调查。直到1990年代,电离层太阳能安静的水流安静的时间日变化TTB应承担的主导。2000年之后,日变化的大小由于赤道变得明显更大电喷流(EEJ)的贡献。天~天变异性增加磁赤道,但他们的振幅归一化平均日变化保持在同样的水平。月球的振幅变化,规范化同样,从5%上升到12%。EEJ地区的出现率早上计数器电喷流(MCEJ)增加靠近磁赤道,下午计数器电喷流(ACEJ)没有。电流来自冠军和群卫星数据显示,MCEJ率随而磁纬度EEJ内区域ACEJ率在很大程度上是常数。热电离层检测电离层的电动力学基于不同的环流模式地磁主要字段配置建议每天,地磁长期变化在TTB可以归因于主要变化长期变化。

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