@Article{SantosAbdSouSobBat:2016:DiZoVe,
author = "Santos, Angela Machado dos and Abdu, Mangalathayil Ali and Souza,
Jonas Rodrigues de and Sobral, Jos{\'e} Humberto Andrade and
Batista, Inez Staciarini",
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)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)}",
title = "Disturbance zonal and vertical plasma drifts in the Peruvian
sector during solar minimum phases",
journal = "Journal of Geophysical Research: Space Physics",
year = "2016",
volume = "121",
number = "3",
pages = "2503--2521",
month = "Mar.",
keywords = "electric field, ionospheric drifts, magnetic storms.",
abstract = "In the present work, we investigate the behavior of the equatorial
F region zonal plasma drifts over the Peruvian region under
magnetically disturbed conditions during two solar minimum epochs,
one of them being the recent prolonged solar activity minimum. The
study utilizes the vertical and zonal components of the plasma
drifts measured by the Jicamarca (11.95°S; 76.87°W) incoherent
scatter radar during two events that occurred on 10 April 1997 and
24 June 2008 and model calculation of the zonal drift in a
realistic ionosphere simulated by the Sheffield University
Plasmasphere-Ionosphere Model-INPE. Two main points are focused:
(1) the connection between electric fields and plasma drifts under
prompt penetration electric field during a disturbed periods and
(2) anomalous behavior of daytime zonal drift in the absence of
any magnetic storm. A perfect anticorrelation between vertical and
zonal drifts was observed during the night and in the initial and
growth phases of the magnetic storm. For the first time, based on
a realistic low-latitude ionosphere, we will show, on a detailed
quantitative basis, that this anticorrelation is driven mainly by
a vertical Hall electric field induced by the primary zonal
electric field in the presence of an enhanced nighttime E region
ionization. It is shown that an increase in the field
line-integrated Hall-to-Pedersen conductivity ratio
\∑H\∑P, which can arise from precipitation of
energetic particles in the region of the South American Magnetic
Anomaly, is capable of explaining the observed anticorrelation
between the vertical and zonal plasma drifts. Evidence for the
particle ionization is provided from the occurrence of anomalous
sporadic E layers over the low-latitude station, Cachoeira
Paulista (22.67°S; 44.9°W)-Brazil. It will also be shown that the
zonal plasma drift reversal to eastward in the afternoon two hours
earlier than its reference quiet time pattern is possibly caused
by weakening of the zonal wind system during the prolonged solar
minimum period.",
doi = "10.1002/2015JA022146",
url = "http://dx.doi.org/10.1002/2015JA022146",
issn = "2169-9402",
language = "en",
targetfile = "santos_disturbance.pdf",
urlaccessdate = "28 abr. 2024"
}