@InProceedings{MedeirosSSVASKKB:2017:UsNeNe,
author = "Medeiros, Cl{\'a}udia and Sibeck, David G. and Souza, Vitor Moura
Cardoso e Silva and Vieira, Lu{\'{\i}}s Eduardo Antunes and
Alves, Livia Ribeiro and Silva, Ligia Alves da and Kanekal,
Shrikanth G. and Kanekal, Shrikanth G. and Baker, Daniel N.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {NASA GSFC}
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 Heliophysics Laboratory, NASA
Goddard Space Flight Center and Heliophysics Laboratory, NASA
Goddard Space Flight Center and LASP",
title = "Using neural network approach to find unusal butterfly pitch angle
distribution shapes",
booktitle = "Proceedings...",
year = "2017",
organization = "AGU Fall Meeting",
abstract = "A special kind of neural network referred to as a Self-Organizing
Map (SOM) was previously adopted to identify, in pitch
angle-resolved relativistic electron flux data provided by the
REPT instrument onboard the Van Allen Probes, three major types of
electron pitch angle distributions (PADs), namely 90o-peaked,
butterfly and flattop (Souza et al., 2016), following the
classification scheme employed by Gannon et al. (2007). Previous
studies show that butterfly distribution can be found in more than
one shape. They usually exhibit an intense decrease near 90° pitch
angles compared to the peaks usually around 30° and 150°.
Sometimes unusual butterfly PAD shapes with peaks near 45° and
135° pitch angles can be observed. These could be correlated with
different physical processes that govern the production and loss
of energetic particles in the Van Allen radiation belt. A neural
network approach allows the distinction of different kinds of
butterfly PADs which were not analyzed in detail by Souza et al.
(2016). This study uses SOM methodology to find these unusual
butterfly PAD shape during the interval between January 1, 2014
and October 1, 2015, during which Van Allen Probes orbit covered
all MLT. The spatial and temporal occurrence of these events were
investigated as well as their solar wind and magnetospheric
drivers.",
conference-location = "New Orleans",
conference-year = "11-15 Dec.",
language = "en",
targetfile = "medeiros_using.pdf",
urlaccessdate = "26 abr. 2024"
}