@Article{AbduSoBaSaSoRaCh:2014:RoElFi,
author = "Abdu, M. A. and Souza, J. R. de and Batista, Inez Staciarini and
Santos, A. M. and Sobral, Jos{\'e} Humberto Andrade and Rastogi,
R. G. and Chandra, H.",
affiliation = "Instituto Nacional de Pesquisas Espaciais - INPE, 12245 970 Sao
Jose dos Campos, Brazil and Instituto Nacional de Pesquisas
Espaciais - INPE, 12245 970 Sao Jose dos Campos, Brazil and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and Instituto
Nacional de Pesquisas Espaciais - INPE, 12245 970 Sao Jose dos
Campos, Brazil and {Instituto Nacional de Pesquisas Espaciais
(INPE)} and Instituto Nacional de Pesquisas Espaciais - INPE,
12245 970 Sao Jose dos Campos, Brazil; Physical Research
Laboratory, Ahmedabad 380 009, India and Physical Research
Laboratory, Ahmedabad 380 009, India",
title = "The role of electric fields in sporadic E layer formation over low
latitudes under quiet and magnetic storm conditions",
journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
year = "2014",
volume = "115-116",
pages = "95--105",
keywords = "Atmospheric electricity, Electric fields, Geomagnetism,
Ionospheric measurement, Magnetosphere, Shielding, Storms, Layer
formation, Low latitudes, Magnetic storms, Penetration electric
field, Vertical Hall eletcric fields, E region.",
abstract = "Sporadic E layers are formed dominantly by wind shear mechanism,
but their formation and dynamics are driven also by ionospheric
electric fields. Investigation of low latitude sporadic E layers
under quiet conditions shows that Es layer formation during post
sunset hours can be disrupted or enhanced depending upon the
vertical structure of the vertical electric field arising from
sunset electrodynamic processes. During magnetic storms the
formation and disruption of these layers are also strongly
controlled by vertical Hall electric field induced by the zonal
magnetospheric electric fields that penetrates to equatorial/low
latitude ionosphere. Observational results on storm time Es layer
responses in the Brazilian and Indian-Asian longitudes are
compared. An under-shielding prompt penetration electric field
(PPEF) of westward polarity that dominate the night side
ionosphere, or an over-shielding electric field also of westward
polarity in the evening sector can cause formation of sporadic E
layers near 100km, while an eastward polarity electric field,
(under-shielding/over-shielding depending upon local time) can
lead to disruption of an Es layer in progress. Ionization
convergence/divergence leading to the Es layer
formation/disruption is driven by a vertical Hall electric field,
induced by the primary zonal PPEF, in the presence of storm
associated enhanced ratio of field line integrated Hall to
Pedersen conductivity (H)/(P). A downward polarity of the Hall
electric field leads to Es layer formation, while an upward
polarity causes the Es layer disruption. An enhancement in the H/P
ratio can result from E layer conductivity enhancement due to
energetic particle precipitation peculiar to the longitude of the
South Atlantic Magnetic Anomaly (SAMA) and/or from a drastic
reduction in integrated Pederson conductivity in the form of
reduced foF2 that is observed in all longitudes.",
doi = "10.1016/j.jastp.2013.12.003",
url = "http://dx.doi.org/10.1016/j.jastp.2013.12.003",
issn = "1364-6826",
label = "scopus 2014-11 AbduSoBaSaSoRaCh:2014:RoElFi",
language = "en",
targetfile = "1-s2.0-S1364682613003155-main.pdf",
urlaccessdate = "28 abr. 2024"
}