Periodic waves in the lower thermosphere observed by OI630 nm airglow images
Periodic wave structures in the thermosphere have been observed at São João do Cariri (geographic coordinates: 36.5° W, 7.4° S; geomagnetic coordinates based on IGRF model to 2015: 35.8° E, 0.48° N) from September 2000 to November 2010 using OI630.0 nm airglow images. During this period, which c...
| Main Authors: | , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-02-01
|
| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/34/293/2016/angeo-34-293-2016.pdf |
| _version_ | 1811256122190856192 |
|---|---|
| author | I. Paulino A. F. Medeiros S. L. Vadas C. M. Wrasse H. Takahashi R. A. Buriti D. Leite S. Filgueira J. V. Bageston J. H. A. Sobral D. Gobbi |
| author_facet | I. Paulino A. F. Medeiros S. L. Vadas C. M. Wrasse H. Takahashi R. A. Buriti D. Leite S. Filgueira J. V. Bageston J. H. A. Sobral D. Gobbi |
| author_sort | I. Paulino |
| collection | DOAJ |
| description | Periodic wave structures in the thermosphere have been observed at São
João do Cariri (geographic coordinates: 36.5° W, 7.4° S; geomagnetic
coordinates based on IGRF model to 2015: 35.8° E, 0.48° N) from
September 2000 to November 2010 using OI630.0 nm airglow images. During this period,
which corresponds to almost one solar cycle, characteristics of 98 waves were
studied. Similarities between the characteristics of these events and
observations at other places around the world were noted, primarily the
spectral parameters. The observed periods were mostly found between 10 and 35 min;
horizontal wavelengths ranged from 100 to 200 km, and phase speed from
30 to 180 m s<sup>−1</sup>. These parameters indicated that some of the waves, presented
here, are slightly faster than those observed previously at low and middle
latitudes (Indonesia, Carib and Japan), indicating that the characteristics
of these waves may change at different places. Most of observed waves have
appeared during magnetically quiet nights, and the occurrence of those waves
followed the solar activity. Another important characteristic is the
quasi-monochromatic periodicity that distinguish them from the single-front
medium-scale traveling ionospheric disturbances (MSTIDs) that have been
observed previously over the Brazilian region. Moreover, most of the observed
waves did not present a phase front parallel to the northeast–southwest
direction, which is predicted by the Perkins instability process. It
strongly suggests that most of these waves must have had different generation
mechanisms from the Perkins instability, which have been pointed out as being a
very important mechanism for the generation of MSTIDs in the lower
thermosphere. |
| first_indexed | 2024-04-12T17:35:16Z |
| format | Article |
| id | doaj.art-d80c035ec1654d23848292fb9fa6ea12 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-04-12T17:35:16Z |
| publishDate | 2016-02-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-d80c035ec1654d23848292fb9fa6ea122022-12-22T03:23:01ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762016-02-013429330110.5194/angeo-34-293-2016Periodic waves in the lower thermosphere observed by OI630 nm airglow imagesI. Paulino0A. F. Medeiros1S. L. Vadas2C. M. Wrasse3H. Takahashi4R. A. Buriti5D. Leite6S. Filgueira7J. V. Bageston8J. H. A. Sobral9D. Gobbi10Unidade Acadêmica de Física, Universidade Federal de Campina Grande, Campina Grande/PB, BrazilUnidade Acadêmica de Física, Universidade Federal de Campina Grande, Campina Grande/PB, BrazilColorado Research Associates, Northwest Research Associates, Boulder, CO 80301, USADivisão de Aeronomia, Instituto Nacional de Pesquisas Espaciais, São José dos Campos/SP, BrazilDivisão de Aeronomia, Instituto Nacional de Pesquisas Espaciais, São José dos Campos/SP, BrazilUnidade Acadêmica de Física, Universidade Federal de Campina Grande, Campina Grande/PB, BrazilUnidade Acadêmica de Física, Universidade Federal de Campina Grande, Campina Grande/PB, BrazilUnidade Acadêmica de Física, Universidade Federal de Campina Grande, Campina Grande/PB, BrazilDivisão de Aeronomia, Instituto Nacional de Pesquisas Espaciais, São José dos Campos/SP, BrazilDivisão de Aeronomia, Instituto Nacional de Pesquisas Espaciais, São José dos Campos/SP, BrazilDivisão de Aeronomia, Instituto Nacional de Pesquisas Espaciais, São José dos Campos/SP, BrazilPeriodic wave structures in the thermosphere have been observed at São João do Cariri (geographic coordinates: 36.5° W, 7.4° S; geomagnetic coordinates based on IGRF model to 2015: 35.8° E, 0.48° N) from September 2000 to November 2010 using OI630.0 nm airglow images. During this period, which corresponds to almost one solar cycle, characteristics of 98 waves were studied. Similarities between the characteristics of these events and observations at other places around the world were noted, primarily the spectral parameters. The observed periods were mostly found between 10 and 35 min; horizontal wavelengths ranged from 100 to 200 km, and phase speed from 30 to 180 m s<sup>−1</sup>. These parameters indicated that some of the waves, presented here, are slightly faster than those observed previously at low and middle latitudes (Indonesia, Carib and Japan), indicating that the characteristics of these waves may change at different places. Most of observed waves have appeared during magnetically quiet nights, and the occurrence of those waves followed the solar activity. Another important characteristic is the quasi-monochromatic periodicity that distinguish them from the single-front medium-scale traveling ionospheric disturbances (MSTIDs) that have been observed previously over the Brazilian region. Moreover, most of the observed waves did not present a phase front parallel to the northeast–southwest direction, which is predicted by the Perkins instability process. It strongly suggests that most of these waves must have had different generation mechanisms from the Perkins instability, which have been pointed out as being a very important mechanism for the generation of MSTIDs in the lower thermosphere.https://www.ann-geophys.net/34/293/2016/angeo-34-293-2016.pdf |
| spellingShingle | I. Paulino A. F. Medeiros S. L. Vadas C. M. Wrasse H. Takahashi R. A. Buriti D. Leite S. Filgueira J. V. Bageston J. H. A. Sobral D. Gobbi Periodic waves in the lower thermosphere observed by OI630 nm airglow images Annales Geophysicae |
| title | Periodic waves in the lower thermosphere observed by OI630 nm airglow images |
| title_full | Periodic waves in the lower thermosphere observed by OI630 nm airglow images |
| title_fullStr | Periodic waves in the lower thermosphere observed by OI630 nm airglow images |
| title_full_unstemmed | Periodic waves in the lower thermosphere observed by OI630 nm airglow images |
| title_short | Periodic waves in the lower thermosphere observed by OI630 nm airglow images |
| title_sort | periodic waves in the lower thermosphere observed by oi630 nm airglow images |
| url | https://www.ann-geophys.net/34/293/2016/angeo-34-293-2016.pdf |
| work_keys_str_mv | AT ipaulino periodicwavesinthelowerthermosphereobservedbyoi630nmairglowimages AT afmedeiros periodicwavesinthelowerthermosphereobservedbyoi630nmairglowimages AT slvadas periodicwavesinthelowerthermosphereobservedbyoi630nmairglowimages AT cmwrasse periodicwavesinthelowerthermosphereobservedbyoi630nmairglowimages AT htakahashi periodicwavesinthelowerthermosphereobservedbyoi630nmairglowimages AT raburiti periodicwavesinthelowerthermosphereobservedbyoi630nmairglowimages AT dleite periodicwavesinthelowerthermosphereobservedbyoi630nmairglowimages AT sfilgueira periodicwavesinthelowerthermosphereobservedbyoi630nmairglowimages AT jvbageston periodicwavesinthelowerthermosphereobservedbyoi630nmairglowimages AT jhasobral periodicwavesinthelowerthermosphereobservedbyoi630nmairglowimages AT dgobbi periodicwavesinthelowerthermosphereobservedbyoi630nmairglowimages |