Variability of the lunar semidiurnal tidal amplitudes in the ionosphere over Brazil
<p>The variability in the amplitudes of the lunar semidiurnal tide was investigated using maps of total electron content over Brazil from January 2011 to December 2014. Long-period variability showed that the annual variation is always present in all investigated magnetic latitudes, and it...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2021-02-01
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| Series: | Annales Geophysicae |
| Online Access: | https://angeo.copernicus.org/articles/39/151/2021/angeo-39-151-2021.pdf |
| _version_ | 1818955209121988608 |
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| author | A. R. Paulino F. D. S. Araújo I. Paulino C. M. Wrasse L. M. Lima P. P. Batista I. S. Batista |
| author_facet | A. R. Paulino F. D. S. Araújo I. Paulino C. M. Wrasse L. M. Lima P. P. Batista I. S. Batista |
| author_sort | A. R. Paulino |
| collection | DOAJ |
| description | <p>The variability in the amplitudes of the lunar semidiurnal tide was investigated using maps of total electron content over Brazil from January 2011 to December 2014. Long-period variability showed that the annual variation is always present in all investigated magnetic latitudes, and it represents the main component of the temporal variability. Semiannual and triannual (two and three times a year, respectively) oscillations were the second and third components, respectively, but they presented significant temporal and spatial variability without a well-defined pattern. Among the short-period oscillations in the amplitude of the lunar tide, the most pronounced ones were concentrated between 7–11 d. These oscillations were stronger around the equinoxes, in particular between September and November in almost all latitudes. In some years, as in 2013 and 2014, for instance, they appeared with a large power spectral density in the winter hemisphere. These observed short-period oscillations could be a result of a direct modulation of the lunar semidiurnal tide by planetary waves from the lower atmosphere and/or due to electrodynamic coupling of E and F regions of the ionosphere.</p> |
| first_indexed | 2024-12-20T10:34:25Z |
| format | Article |
| id | doaj.art-bdb656709f794d25aec1469da1f75801 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-20T10:34:25Z |
| publishDate | 2021-02-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-bdb656709f794d25aec1469da1f758012022-12-21T19:43:40ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762021-02-013915116410.5194/angeo-39-151-2021Variability of the lunar semidiurnal tidal amplitudes in the ionosphere over BrazilA. R. Paulino0F. D. S. Araújo1I. Paulino2C. M. Wrasse3L. M. Lima4P. P. Batista5I. S. Batista6Departamento de Física, Universidade Estadual da Paraíba, Campina Grande, BrazilDepartamento de Física, Universidade Estadual da Paraíba, Campina Grande, BrazilUnidade Acadêmica de Física, Universidade Federal de Campina Grande, Campina Grande, BrazilDivisão de Clima Espacial, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, BrazilDepartamento de Física, Universidade Estadual da Paraíba, Campina Grande, BrazilDivisão de Heliofísica, Ciências Planetárias e Aeronomia, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, BrazilDivisão de Heliofísica, Ciências Planetárias e Aeronomia, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, Brazil<p>The variability in the amplitudes of the lunar semidiurnal tide was investigated using maps of total electron content over Brazil from January 2011 to December 2014. Long-period variability showed that the annual variation is always present in all investigated magnetic latitudes, and it represents the main component of the temporal variability. Semiannual and triannual (two and three times a year, respectively) oscillations were the second and third components, respectively, but they presented significant temporal and spatial variability without a well-defined pattern. Among the short-period oscillations in the amplitude of the lunar tide, the most pronounced ones were concentrated between 7–11 d. These oscillations were stronger around the equinoxes, in particular between September and November in almost all latitudes. In some years, as in 2013 and 2014, for instance, they appeared with a large power spectral density in the winter hemisphere. These observed short-period oscillations could be a result of a direct modulation of the lunar semidiurnal tide by planetary waves from the lower atmosphere and/or due to electrodynamic coupling of E and F regions of the ionosphere.</p>https://angeo.copernicus.org/articles/39/151/2021/angeo-39-151-2021.pdf |
| spellingShingle | A. R. Paulino F. D. S. Araújo I. Paulino C. M. Wrasse L. M. Lima P. P. Batista I. S. Batista Variability of the lunar semidiurnal tidal amplitudes in the ionosphere over Brazil Annales Geophysicae |
| title | Variability of the lunar semidiurnal tidal amplitudes in the ionosphere over Brazil |
| title_full | Variability of the lunar semidiurnal tidal amplitudes in the ionosphere over Brazil |
| title_fullStr | Variability of the lunar semidiurnal tidal amplitudes in the ionosphere over Brazil |
| title_full_unstemmed | Variability of the lunar semidiurnal tidal amplitudes in the ionosphere over Brazil |
| title_short | Variability of the lunar semidiurnal tidal amplitudes in the ionosphere over Brazil |
| title_sort | variability of the lunar semidiurnal tidal amplitudes in the ionosphere over brazil |
| url | https://angeo.copernicus.org/articles/39/151/2021/angeo-39-151-2021.pdf |
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