@Article{VenkateshRamFagSeeBat:2017:PaDa17,
author = "Venkatesh, K. and Ram, S. Tulasi and Fagundes, P. R. and Seemala,
Gopi K. and Batista, Inez Staciarini",
affiliation = "{Universidade do Vale do Para{\'{\i}}ba (UNIVAP)} and {Indian
Institute of Geomagnetism} and {Universidade do Vale do
Para{\'{\i}}ba (UNIVAP)} and {Indian Institute of Geomagnetism}
and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Electrodynamic disturbances in the Brazilian equatorialand
low-latitude ionosphere on St. Patrick’s Daystorm of 17 March
2015",
journal = "Journal of Geophysical Research: Space Physics",
year = "2017",
volume = "122",
number = "4",
pages = "4553--4570",
month = "Apr.",
keywords = "equatorial ionization anomaly, prompt penetration electric field,
St. Patrick's day storm, super fountain effect.",
abstract = "The St. Patrick's Day storm of 17 March 2015 has a long-lasting
main phase with the Dst reaching a minimum of \−223 nT.
During the main phase, two strong prompt penetration electric
field (PPEF) phases took place; first with the southward turning
of IMF Bz around ~1200 UT and the second with the onset of a
substorm around ~1725 UT leading to strong equatorial zonal
electric field enhancements. The consequent spatiotemporal
disturbances in the ionospheric total electron content and the
resultant modifications in the equatorial ionization anomaly (EIA)
over the Brazilian longitudinal sector are investigated in detail.
The simultaneous measurements from a large network of GPS
receivers, ionosonde, and magnetometers over the Brazilian
longitudinal sector are used for this study. In the presence of
enhanced zonal electric field, the equatorial F2 layer peak (hmF2)
experienced a rapid uplift without any significant change in the
base height (h\′F); while the F2 layer is redistributed
into F2 and F3 layers. The enhanced zonal electric filed due to
PPEF led to the strong super fountain effect under which the
anomaly crest departed poleward to ~40°S latitude. In the presence
of westward and equatorward wind surge over Brazil with the
coexisting disturbance dynamo fields, strong hemispheric asymmetry
is seen in the storm time response of EIA during both the PPEF
phases.",
doi = "10.1002/2017JA024009",
url = "http://dx.doi.org/10.1002/2017JA024009",
issn = "2169-9402",
language = "en",
targetfile = "Venkatesh_electrodynamic.pdf",
urlaccessdate = "27 abr. 2024"
}