@Article{SouzaEcheBolzHajr:2018:CrCrAn,
author = "Souza, Adriane Marques de and Echer, Ezequiel and Bolzan, Mauricio
Jos{\'e} Alves and Hajra, Rajkumar",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade Federal
de Jata{\'{\i}}} and Laboratoire de Physique et Chimie de
l’Environnement et de l’Espace, CNRS",
title = "Cross-correlation and cross-wavelet analyses of the solar wind IMF
Bz and auroral electrojet index AE coupling during HILDCAAs",
journal = "Annales Geophysicae",
year = "2018",
volume = "36",
number = "1",
pages = "205--211",
keywords = "Magnetospheric physics (solar-wind– magnetosphere interactions).",
abstract = "Solar-windgeomagnetic activity coupling during high-intensity
long-duration continuous AE (auroral electrojet) activities
(HILDCAAs) is investigated in this work. The 1 min AE index and
the interplanetary magnetic field (IMF) Bz component in the
geocentric solar magnetospheric (GSM) coordinate system were used
in this study. We have considered HILDCAA events occurring between
1995 and 2011. Cross-wavelet and cross-correlation analyses
results show that the coupling between the solar wind and the
magnetosphere during HILDCAAs occurs mainly in the period
\≤ 8 h. These periods are similar to the periods observed
in the interplanetary Alfv{\'e}n waves embedded in the high-speed
solar wind streams (HSSs). This result is consistent with the fact
that most of the HILDCAA events under present study are related to
HSSs. Furthermore, the classical correlation analysis indicates
that the correlation between IMF Bz and AE may be classified as
moderate (0.40.7) and that more than 80 % of the HILDCAAs exhibit
a lag of 2030 min between IMF Bz and AE. This result corroborates
with Tsurutani et al. (1990) where the lag was found to be close
to 2025 min. These results enable us to conclude that the main
mechanism for solar-windmagnetosphere coupling during HILDCAAs is
the magnetic reconnection between the fluctuating, negative
component of IMF Bz and Earths magnetopause fields at periods
lower than 8 h and with a lag of about 2030 min.",
doi = "10.5194/angeo-36-205-2018",
url = "http://dx.doi.org/10.5194/angeo-36-205-2018",
issn = "0992-7689",
label = "self-archiving-INPE-MCTIC-GOV-BR",
language = "en",
targetfile = "souza_cross.pdf",
urlaccessdate = "27 abr. 2024"
}