@InProceedings{PaulaMNMCASCMVBS:2019:DaGNSi,
author = "Paula, Eurico Rodrigues de and Martinon, Andr{\'e} Ricardo
Fazanaro and Neri, Jos{\'e} Angelo da Costa Ferreira and Moraes,
Alison de Oliveira and Cecatto, Jos{\'e} Roberto and Abdu,
Mangalathayil Ali and Sobral, Jos{\'e} Humberto Andrade and Cunha
Neto, Ac{\'a}cio and Monico, Jo{\~a}o Francisco Galera and Vani,
Bruno Cesar and Batista, Inez Staciarini and Souza, Jonas
Rodrigues de",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto de Aeron{\'a}utica e
Espa{\c{c}}o (IAE)} 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)} and
{Universidade Estadual Paulista (UNESP)} and {Universidade
Estadual Paulista (UNESP)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)}",
title = "Daytime GNSS signal fading and scintillation associated with solar
burst events",
year = "2019",
organization = "AGU Fall Meeting",
abstract = "Daytime GNSS data from Brazilian longitudinal sector were analyzed
during some solar burst events of different intensities. These
events were chosen using data from the RF solar observatories and
the GOES X-ray flux. Even during low solar activity period, the
bursts can occur with durations of a few tens of seconds up to few
hours depending on the intensity. During these events, GPS,
GLONASS, Galileo constellations and SBAS signals presented
simultaneous fadings up to 5 dBs and 10 dBs in the L1 and L2
frequencies, respectively. The daytime S4 amplitude scintillation
indices up to 0.4 were also simultaneously observed in all
satellites signals. With the aim of understanding the physical
mechanisms responsible for such abnormal GNSS signal behavior
during these events, magnetometer and Digisonde data were also
analyzed. Large variation in the magnetometer H component and in
the ionogram parameters were observed compared to quiet time.
During some of the analyzed events the ionospheric F layer base
represented by h´F presented large values following data gaps due
to the total or partial absorption of the HF wave caused by the
increased D region density due to the solar burst. Depending on
the solar burst intensity and duration the GNSS receivers may fail
to produce accurate navigation solution, thus making it important
to study this kind of phenomenon. This work may contribute also to
better understand the physics of the burst effects in the
ionosphere and how to mitigate their effects on the positioning
and navigation systems oriented by satellite.",
conference-location = "San Francisco, CA",
conference-year = "09-13 dec.",
language = "en",
targetfile = "paula_daytime.pdf",
urlaccessdate = "21 maio 2024"
}