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Discussion papers
https://doi.org/10.5194/angeo-2019-123
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-123
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 27 Aug 2019

Submitted as: regular paper | 27 Aug 2019

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

Characterization of gravity waves in the lower ionosphere using VLF observations at Comandante Ferraz Brazilian Antarctic Station

Emilia Correia1,2, Luis Tiago Medeiros Raunheitte2, José Valentin Bageston3, and Dino Enrico D'Amico2 Emilia Correia et al.
  • 1Instituto Nacional de Pesquisas Espaciais, INPE, São José dos Campos-SP, Brazil
  • 2Centro de Rádio Astronomia e Astrofísica Mackenzie, Universidade Presbiteriana Mackenzie, São Paulo-SP, Brazil
  • 3Centro Regional Sulde Pesquisas Espaciais, CRS/INPE, Santa Maria-RS, Brazil

Abstract. The goal of this work is to investigate the gravity waves (GWs) characteristics in the low ionosphere using very low frequency (VLF) radio signals. The spatial modulations produced by the GWs affect the conditions of the electron density at reflection height of the VLF signals, which produce fluctuations of the electrical conductivity in the D-region that can be detected as variations in the amplitude and phase of VLF narrowband signals. The analysis considered the VLF signal transmitted from the US Cutler/Marine (NAA) station that was received at Comandante Ferraz Brazilian Antarctic Station (EACF, 62.1° S, 58.4° W), which is a great circle path crossing longitudinally the Drake Passage. The wave periods of the GWs detected in the low ionosphere are obtained using the wavelet analysis applied to the VLF amplitude. The use of the VLF technique was validated comparing the wave period and duration properties of one GW event observed simultaneously with a co-located airglow all-sky imager both operating at EACF. The statistical analysis of the wave periods detected using VLF technique for 2007 showed that the GW events occur almost all nights, with a higher frequency per month from March to October. The predominant wave periods are more frequent between 10 and 15 min occurring preferentially during the equinoxes, but there are some events with periods higher than 60 min appearing only in the solstices (January and July). These results show that VLF technique is a powerful tool to obtain the wave period and duration of GW events in the low ionosphere, with the advantage to be independent of sky conditions, and can be used during daytime and year-round.

Emilia Correia et al.
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Short summary
Here is presented the investigation of gravity waves (GWs) properties in the low ionosphere using very low frequency (VLF) radio signals. The VLF technique showed to be a powerful tool to obtain the wave period and duration of GW events in the low ionosphere, and can be used independent of sky conditions, during daytime and year-round, which is an advantage in comparison with airglow all-sky imagers.
Here is presented the investigation of gravity waves (GWs) properties in the low ionosphere...
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