Semimonthly oscillation observed in the start times of equatorial plasma bubbles

Autor: I. Paulino, A. R. Paulino, R. Y. C. Cueva, E. Agyei-Yeboah, R. A. Buriti, H. Takahashi, C. M. Wrasse, Â. M. Santos, A. Fragoso de Medeiros, I. S. Batista
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Annales Geophysicae, Vol 38, Pp 437-443 (2020)
Druh dokumentu: article
ISSN: 0992-7689
1432-0576
DOI: 10.5194/angeo-38-437-2020
Popis: Using airglow data from an all-sky imager deployed at São João 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 São Luís (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.
Databáze: Directory of Open Access Journals
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