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Discussion papers
https://doi.org/10.5194/angeo-2019-62
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-62
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 02 May 2019

Regular paper | 02 May 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

Semimonthly oscillation observed in the start time of equatorial Spread-F

Igo Paulino1, Ana Roberta Paulino2, Ricardo Yvan de la Cruz Cueva3, Ebenezer Agyei-Yeboah4, Ricardo Arlen Buriti1, Hisao Takahashi5, Cristiano Max Wrasse5, and Amauri Fragoso de Medeiros1 Igo Paulino et al.
  • 1Unidade Acadêmica de Física, Universidade Federal de Campina Grande, Campina Grande, Brazil
  • 2Departamento de Física, Universidade Estadual da Paraíba, Campina Grande, Brazil
  • 3Departamento de Física, Universidade Estadual do Maranhão, São Luís, Brazil
  • 4Instituto de Pesquisa e Desenvolvimento, Universidade do Vale do Paraíba, São José dos Campos, Brazil
  • 5Divisão de Aeronomia, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, Brazil

Abstract. Using data from airglow an all sky imager and a coherent backscatter radar deployed at São João do Cariri (7.4° S, 36.5° W) and São Luís (2.6° S, 44.2° W), respectively, the start time of equatorial Spread-F were studied. Data from a period of over 10 years was investigated from 2000 to 2010. The semimonthly oscillations were clearly revealed in the start time of plasma bubbles from Oi6300 airglow images during three periods (September 2003, September–October 2005, November 2005 and January 2008). Since the airglow measurements are not continuous in time, more than one cycle of oscillation in the start time of plasma bubbles cannot be observed from these data. Thus, coherent backscatter radar data appeared as an alternative to investigate the start time of the ionospheric irregularities. Semimonthly oscillation were observed in the start time of plumes (November 2005) and bottom type Spread-F (November 2008) with at least one complete cycle. Technical/climate issues did not allowed to observe the semimonthly oscillations simultaneously by the two instruments, but from September to December 2005 there was a predominance of this spread-F start time oscillation over Brazil. The presence of this oscillation certainly contribute to the day-to-day variability of spread-F.

Igo Paulino et al.
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Short summary
In this paper, an extensive study has been done in order to investigate periodic oscillation in the start time of spread-F observed over Brazil. Using OI6300 airglow images and range time integration from a backscatter coherent radar, it was possible to detect semimonthly oscillations in the start time of Equatorial Plasma Bubbles, Plumes and Bottom-type spread-F. The knowledge of this oscillation must be important to understand the dynamics of the day-to-day variability of spread-F.
In this paper, an extensive study has been done in order to investigate periodic oscillation in...
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