Semimonthly oscillation observed in the start times of equatorial plasma bubbles

Autor(es)

Paulino, Igo ^[1] ; Paulino, Ana Roberta ^[2] ; Cueva, Ricardo Y. C. ^[3] ; Agyei-Yeboah, Ebenezer ^[4] ; Buriti, Ricardo Arlen ^[1] ; Takahashi, Hisao ^[5] ; Wrasse, Cristiano Max ^[5] ; Santos, Angela M. ^[5] ; de Medeiros, Amauri Fragoso ^[1] ; Batista, Inez S. ^[5]

Afiliação do(s) autor(es)

^[1] Univ Fed Campina Grande, Unidade Acad Fis, Campina Grande, Paraiba - Brazil

^[2] Univ Estadual Paraiba, Dept Fis, Campina Grande, Paraiba - Brazil

^[3] Univ Estadual Maranhao, Dept Fis, Sao Luis, Maranhao - Brazil

^[4] Univ Vale Paraiba, Inst Pesquisa & Desenvolvimento, Sao Jose Dos Campos - Brazil

^[5] Inst Nacl Pesquisas Espaciais, Div Aeron, Sao Jose Dos Campos - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Annales Geophysicae; v. 38, n. 2, p. 437-443, MAR 31 2020.
• Citações Web of Science: 0

Resumo

Using airglow data from an all-sky imager deployed at Sao Joao do Cariri (7.4 degrees S, 36.5 degrees 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 016300 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 degrees S, 44.2 degrees 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. (AU)

• Processo FAPESP: 15/25357-4 - Climatologia das camadas intermediárias sobre o setor equatorial e de baixas latitudes brasileiras
• Beneficiário: Angela Machado dos Santos Valentim
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado