Negative phases at South-American stations during magnetic storms
Ionospheric data at three South-American stations (in low, mid and high latitudes) show negative phases in the high latitude location during magnetic storms. The negative phases in foF2 are caused by changes in the ratio between atomic and molecular concentrations of the neutral atmosphere.We find t...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2000 |
| País: | México |
| Institución: | UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO |
| Repositorio: | Geofísica Internacional |
| Idioma: | español |
| OAI Identifier: | oai:revistagi.geofisica.unam.mx:article/679 |
| Acceso en línea: | http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/679 |
| Access Level: | acceso abierto |
| Palabra clave: | Ionosfera tormentas magnéticas fases negativas Ionosphere magnetic storms negative phases |
| Sumario: | Ionospheric data at three South-American stations (in low, mid and high latitudes) show negative phases in the high latitude location during magnetic storms. The negative phases in foF2 are caused by changes in the ratio between atomic and molecular concentrations of the neutral atmosphere.We find that at high latitudes the negative phases are well explained by the [O]/[N ] rate changes. As the latitude decreases, as the wind influence on the F2 layer peak is dominant, the propagation of gravity waves can explain short-lived negative phases. In low latitudes, disturbed thermospheric winds can cause time delays in the normal pattern of foF2, creating alternating positive and negative phases. |
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