@InProceedings{RezendePaKaMuMoCaSm:2007:OvIoSc,
author = "Rezende, Luiz Felipe de Campos and Paula, Eurico Rodrigues de and
Kantor, Ivan Jelinek and Muella, Marcio Tadeu de Assis Honorato
and Moor, L. P. and Campos, Alessandro Augusto Nunes and Smorigo,
Paulo Flabiano",
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 {} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)}",
title = "An overview of ionospheric scintillation at low and equatorial
latitudes",
booktitle = "Proceedings...",
year = "2007",
organization = "Latin-American Conference on Space Geophysics, 8. (COLAGE).",
abstract = "Ionospheric plasma irregularities or bubbles ( regions with
depleted density ) are generated at the magnetic equator after
sunset due to plasma instabilities, and as they move upward
mapping along the magnetic field lines to low latitudes. They are
determinant factors to cause scintillation. The ionospheric
scintillations affect the performance of GNSS (Global Navigation
Satellite System). Scintillation occurs when a radio wave crosses
the ionosphere and suffers a distortion of phase and amplitude.
Scintillation in the signal amplitude and phase contributes to GPS
( Global Positioning System ) receivers loss of lock, decreasing
the number of available satellites and consequently the
possibility to get a good satellite geometry GDOP (geometric
dilution of precision ). A good geometry is necessary to get
accuracy and to attend aerial navigation requirements. The
ionospheric irregularities present a large dependence on solar
flux, local time, season, latitude, longitude and magnetic
disturbances. During magnetic storms direct penetration of
eastward magnetospheric electric fields, occurring during the post
sunset hours, can intensify the prereversal electric field thereby
enhancing the irregularity process, or triggering irregularities,
even during epochs outside of the irregularity season in Brazil.
Disturbance dynamo westward zonal electric fields during some
magnetic storms can reach low latitudes with a delay of 9 to 30
hours after the storm onset and reduces the plasma upward drift
during day and downward drift during night. In this way the
prereversal vertical drift peak is inhibited / reduced in
amplitude and, as a result, the ionospheric irregularity
generation is weakened or inhibited.",
conference-location = "Merida, Mexico",
conference-year = "11-17 July",
language = "en",
urlaccessdate = "15 jun. 2024"
}