Impact of disturbance electric fields in the evening on prereversal vertical drift and spread F developments in the equatorial ionosphere
Equatorial plasma bubble/spread F irregularity occurrence can present large variability depending upon the intensity of the evening prereversal enhancement in the zonal electric field (PRE), that is, the F region vertical plasma drift, which basically drives the post-sunset irregularity developm...
| Principais autores: | , , , , , |
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| Formato: | Artigo |
| Idioma: | English |
| Publicado em: |
Copernicus Publications
2018-04-01
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| coleção: | Annales Geophysicae |
| Acesso em linha: | https://www.ann-geophys.net/36/609/2018/angeo-36-609-2018.pdf |
| Resumo: | Equatorial plasma bubble/spread F irregularity occurrence can present large
variability depending upon the intensity of the evening prereversal
enhancement in the zonal electric field (PRE), that is, the F region
vertical plasma drift, which basically drives the post-sunset irregularity
development. Forcing from magnetospheric disturbances is an important source
of modification and variability in the PRE vertical drift and of the
associated bubble development. Although the roles of magnetospheric
disturbance time penetration electric fields in the bubble irregularity
development have been studied in the literature, many details regarding the
nature of the interaction between the penetration electric fields and the
PRE vertical drift still lack our understanding. In this paper we have
analyzed data on F layer heights and vertical drifts obtained from
digisondes operated in Brazil to investigate the connection between magnetic
disturbances occurring during and preceding sunset and the consequent
variabilities in the PRE vertical drift and associated equatorial spread F (ESF) development. The
impact of the prompt penetration under-shielding eastward electric field and
that of the over-shielding, and disturbance dynamo, westward electric field
on the evolution of the evening PRE vertical drift and thereby on the ESF
development are briefly examined. |
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| ISSN: | 0992-7689 1432-0576 |