@InProceedings{AdhikariMendDomiEche:2018:ChHiIn,
author = "Adhikari, Binod and Mendes J{\'u}nior, Odim and Domingues,
Margarete Oliveira and Echer, Ezequiel",
affiliation = "{St. Xavier’s College} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Characteristics of high intensity long duration continuous auroral
activities (hildcaas) and estimation of akasofu parameters along
with its correction",
year = "2018",
organization = "Cospar Scientific Assembly, 42.",
abstract = "High Intensity Long Duration Continuous AE Activities (HILDCAAs)
are form of geomagnetic disturbances caused by intermittent
magnetic reconnection. By definition of HILDCAAs, which are
intense auroral activity characterized by peak AE intensity
greater than 1000nT at least for 2 days and within this period the
value of AE never drops below 200nT for more than 2 h at a time.
In our work, we study the characteristics of HILDCAA events based
on auroral electrojet index and component of interplanetary
magnetic field (Bz) using continuous wavelet transform and
discrete wavelet transform. We also estimate the Akasofu
parameters and its corrections during HILDCAAs. We found that
during HILDCAAs, there is high fluctuation in IMF-Bz with
corresponding peak of AE index. The CWT analysis shows highest
intensity power areas from 50 to 300 minutes for both AE and Bz
during the HILDCAAs. In DWT analysis, we used higher level of
decomposition to identity the common singularities present on AE
and Bz. Moreover, we found that different HILDCAA events have
different geoeffectiveness based on their interplanetary cause and
the amount of the average energy transferred to the
magnetospheric/ionospheric system. We also found that second
correction in Akasofu parameter gives nearly thrice the amount of
energy predicted by Akasofu parameter without correction. This
indicates that the solar wind magnetosphere energy coupling
efficiency during the main phase of the storm is larger than in
the HILDCAA interval.",
conference-location = "Pasadena, California",
conference-year = "14-22 July",
language = "en",
urlaccessdate = "29 mar. 2024"
}