@InProceedings{DamascenoCorrMach:2018:MuObIo,
author = "Damasceno, Gabriel Campos and Correia, Em{\'{\i}}lia and Macho,
Eduardo Perez",
affiliation = "{Universidade Presbiteriana Mackenzie} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Universidade Presbiteriana
Mackenzie}",
title = "Multi-instrument observations of the ionospheric response to the 7
September 2017 geomagnetic storm in the South American Sector",
year = "2018",
organization = "Latin American Conference on Space Geophysics, 11. (COLAGE)",
abstract = "The South American ionospheric behavior during the period from 05
to 10 September 2017 is investigated using data from GNSS network
from Continuous Monitoring Brazilian Network (RBMC) and ionosondes
available in the Space Weather Brazilian Studying and Monitoring
(Embrace) site. The geomagnetic activity was produced by the
impact of two Coronal Mass Ejections (CMEs) on the Earth
magnetosphere . The first one caused a geomagnetic storm that
started at 19:00 UT on 07 September and reached the maximum at
02:00 UT on 08 September with DST Index of -142 nT (Intense
Storm), KP index 8 and Auroral index 1500 nT. During the
recovering phase of this storm another CME arrived at 11:00 UT on
08 September increasing the geomagnetic activity, with Dst
reaching -122 nT at 15:00 UT. The Vertical Total Electron Content
(VTEC) measured at different latitudes shows a distinct
ionospheric response to each storm phase. During the onset main
phase of the geomagnetic storm on 7 September VTEC increased at
equatorial latitudes during afternoon, and after sunset shows
another increase as consequence of electricfield associated with
the evening Pre-reversal Enhancement (PRE). In association with
the intensification of magnetic storm on 8 September, the VTEC
shows an increase during sunrise and the fountain effect was
intensified. The results shows that during the first hours of the
main phase geomagnetic storm the ionospheric response was mainly
affected by the prompt penetration electric fields (PPEFs), being
a combination of PPEF and dynamo effects afterwards.",
conference-location = "Buenos Aires, Argentina",
conference-year = "16-20 abr.",
language = "en",
urlaccessdate = "20 maio 2024"
}