@Article{SilvaSobrKogaSouz:2017:EvPrPe,
author = "Silva, Regia Pereira and Sobral, Jose Humberto Andrade and Koga,
Daiki and Souza, Jonas Rodrigues",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)}",
title = "Evidence of prompt penetration electric fields during HILDCAA
events",
journal = "Annales Geophysicae",
year = "2017",
volume = "35",
pages = "1165--1176",
keywords = "Ionosphere (equatorial ionosphere, ionosphere– magnetosphere
interactions, ionospheric disturbances).",
abstract = "High-intensity, long-duration continuous auroral electrojet (AE)
activity (HILDCAA) events may occur during a long-lasting recovery
phase of a geomagnetic storm. They are a special kind of
geomagnetic activity, different from magnetic storms or substorms.
Ionized particles are pumped into the auroral region by the action
of Alfv{\'e}n waves, increasing the auroral current system. The
Dst index, however, does not present a significant downward swing
as it occurs during geomagnetic storms. During the HILDCAA
occurrence, the AE index presents an intense and continuous
activity. In this paper, the response of Brazilian equatorial
ionosphere is studied during three HILDCAA events that occurred in
the year of 2006 (the descending phase of solar cycle 23) using
the digisonde data located at S{\~a}o Lu{\'{\i}}s, Brazil
(2.33\◦ S, 44.2\◦ W; dip latitude 1.75\◦ S).
Geomagnetic indices and interplanetary parameters were used to
calculate a cross-correlation coefficient between the Ey component
of the interplanetary electric field and the F2 electron density
peak height variations during two situations: the first of them
for two sets daytime and nighttime ranges, and the second one for
the time around the pre-reversal enhancement (PRE) peak. The
results showed that the pumping action of particle precipitation
into the auroral zone has moderately modi- fied the equatorial F2
peak height. However, F2 peak height seems to be more sensitive to
HILDCAA effects during PRE time, showing the highest variations
and sinusoidal oscillations in the cross-correlation indices.",
doi = "10.5194/angeo-35-1165-2017",
url = "http://dx.doi.org/10.5194/angeo-35-1165-2017",
issn = "0992-7689",
language = "en",
targetfile = "silva_evidence.pdf",
urlaccessdate = "26 abr. 2024"
}