@InProceedings{PiassiSilvPadi:2018:AnPcPc,
author = "Piassi, Amanda Resende and Silva, Ligia Alves da and Padilha,
Ant{\^o}nio Lopes",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)}",
title = "Analysis of Pc3 and Pc4 magnetic pulsations in the South Atlantic
Magnetic Anomaly region",
year = "2018",
organization = "Latin American Conference on Space Geophysics, 11. (COLAGE)",
abstract = "Much of South America is aected by the South Atlantic Magnetic
Anomaly (SAMA), characterized by the minimum intensity of the
geomagnetic eld on the Earths surface. Due to the presence of this
anomaly, there is an increase in particle precipitation from the
internal radiation belt that surrounds the planet, generating
dierent aeronomic eects. In this study, we investigated the eect
of this process on the amplitude of Pc3-Pc4 magnetic pulsations as
a function of the distance from the center of the anomaly. Data
from highly sensitive uxgate magnetometers (1 Hz acquisition rate)
operated by the Brazilian Space Weather Program (EMBRACE) and
INTERMAGNET in several locations in South America are used in the
analyzes. Four magnetic storms were selected during the year 2015
and data from 7 days before (quiet period) and 7 days after each
storm (most disturbed period, including the recovery phase) were
ltered in the Pc3-Pc4 intervals. The results show a permanent
amplication in the pulsation amplitude at the station closest to
the center of the anomaly. It is proposed that this amplication is
linked to the increase of the ionospheric conductivity in SAMA,
caused by the enhanced particle precipitation from the radiation
belt. Also, this eect is continuous in the anomaly region, being
valid for both low level geomagnetic activity (quiet days) and
high level geomagnetic activity (disturbed days).",
conference-location = "Buenos Aires, Argentina",
conference-year = "16-20 abr.",
language = "en",
urlaccessdate = "27 abr. 2024"
}