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Semimonthly oscillation observed in the start times of equatorial plasma bubbles
Annales Geophysicae ( IF 1.7 ) Pub Date : 2020-03-31 , DOI: 10.5194/angeo-38-437-2020
Igo Paulino , Ana Roberta Paulino , Ricardo Y. C. Cueva , Ebenezer Agyei-Yeboah , Ricardo Arlen Buriti , Hisao Takahashi , Cristiano Max Wrasse , Ângela M. Santos , Amauri Fragoso de Medeiros , Inez S. Batista

Abstract. Using airglow data from an all-sky imager deployed at Sao Joao do Cariri (7.4 ∘ S, 36.5 ∘ W), the start times of equatorial plasma bubbles was studied in order to investigate the day-to-day variability of this phenomenon. Data from a period over 10 years were analyzed from 2000 to 2010. Semimonthly oscillations were clearly observed in the start times of plasma bubbles from OI6300 airglow images during this period of observation, and four case studies (September 2003, September–October 2005, November 2005 and January 2008) were chosen to show in detail this kind of modulation. Since the airglow measurements are not continuous in time, more than one cycle of oscillation in the start times of plasma bubbles cannot be observed from these data. Thus, data from a digisonde at Sao Luis (2.6 ∘ S, 44.2 ∘ W) in November 2005 were used to corroborate the results. Technical/climate issues did not allow one to observe the semimonthly oscillations simultaneously by the two instruments, but from October to November 2005 there was a predominance of this oscillation in the start times of the irregularities over Brazil. Besides, statistical analysis for the data in the whole period of observation has shown that the lunar tide, which has semimonthly variability, is likely the main forcing for the semimonthly oscillation in the start times of equatorial plasma bubbles. The presence of this oscillation can contribute to the day-to-day variability of equatorial plasma bubbles.

中文翻译:

在赤道等离子体气泡的开始时间观察到的半月振荡

摘要。使用部署在 Sao Joao do Cariri (7.4 ∘ S, 36.5 ∘ W) 的全天空成像仪的气辉数据,研究了赤道​​等离子体气泡的开始时间,以研究这种现象的日常变化。分析了 2000 年至 2010 年超过 10 年的数据。在此观察期间,OI6300 气辉图像中等离子体气泡的起始时间明显存在半月振荡,四个案例研究(2003 年 9 月、2005 年 9 月至 10 月、11 月2005 年和 2008 年 1 月)被选择来详细展示这种调制。由于气辉测量在时间上不是连续的,因此无法从这些数据中观察到等离子体气泡开始时间的振荡周期超过一个周期。因此,来自圣路易斯 (2.6 ∘ S, 44. 2 ∘ W) 在 2005 年 11 月被用来证实结果。技术/气候问题不允许人们同时观察到这两种仪器的半月振荡,但从 2005 年 10 月到 11 月,这种振荡在巴西上空不规则的开始时间占主导地位。此外,对整个观测周期数据的统计分析表明,具有半月变化性的月球潮汐可能是赤道等离子体气泡开始时间半月振荡的主要推动力。这种振荡的存在会导致赤道等离子体气泡的日常变化。但从 2005 年 10 月到 11 月,在巴西上空违规的开始时间,这种振荡占主导地位。此外,对整个观测周期数据的统计分析表明,具有半月变化性的月球潮汐可能是赤道等离子体气泡开始时间半月振荡的主要推动力。这种振荡的存在会导致赤道等离子体气泡的日常变化。但从 2005 年 10 月到 2005 年 11 月,这种振荡在巴西上空违规行为的开始时间占主导地位。此外,对整个观测周期数据的统计分析表明,具有半月变化性的月球潮汐可能是赤道等离子体气泡开始时间半月振荡的主要推动力。这种振荡的存在会导致赤道等离子体气泡的日常变化。
更新日期:2020-03-31
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