@Article{CardosoAlPaFiSiCoKo:2017:AuPrEn,
author = "Cardoso, F. R. and Alves, Maria Virginia and Parks, G. K. and
Fillingim, M. O . and Sim{\~o}es Junior, F. J. R. and Costa
J{\'u}nior, E. and Koga, Daiki",
affiliation = "{Universidade de S{\~a}o Paulo (USP)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {University of California} and
{University of California} and {Universidade Federal de Pelotas
(UFPEL)} and {Instituto Federal de Minas Gerais} and {Instituto
Nacional de Pesquisas Espaciais (INPE)}",
title = "Auroral precipitating energy during long magnetic storms",
journal = "Journal of Geophysical Research: Space Physics",
year = "2017",
volume = "122",
pages = "2016JA023780",
keywords = "electron precipitation, POLAR data, auroral region.",
abstract = "The power energy input carried by precipitating electrons into the
auroral zone is an important parameter for understanding the solar
wind-magnetosphere energy transfer processes and magnetic storms
triggering. Some magnetic storms present a peculiar long recovery
phase, lasting for many days or even weeks, which can be
associated with the intense and long-duration auroral activity
named HILDCAA (High Intensity Long Duration Continuous AE
Activity). The auroral energy input during HILDCAAs has been
pointed out as an essential key issue, although there have been
very few quantitative studies on this topic. In the present work,
we have estimated the auroral electron precipitating energy during
the events of long (LRP) and short (SRP) storm recovery phase. The
energy has been calculated from the images produced by the
Ultraviolet Imager (UVI) on board the Polar satellite. In order to
obtain accurate energy values, we developed a dayglow estimate
method to remove solar contamination from the UVI images, before
calculating the energy. We compared the UVI estimate to the
Hemispheric Power (HP), to the empirical power obtained from the
AE index, and to the solar wind input power. Our results showed
that the UVI electron precipitating power for the LRP events
presented a quasiperiodic fluctuation, which has been confirmed by
the other estimates. We found that the LRP events are a
consequence of a directly driven system, where there is no
long-term energy storage in the magnetosphere, and the auroral
electrojets during these events are directly affected by the
electron precipitating power.",
doi = "10.1002/2016ja023780",
url = "http://dx.doi.org/10.1002/2016ja023780",
issn = "2169-9402",
label = "lattes: 6460301165792800 2 CardosoAlPaFiJrJrKo:2017:AuPrEn",
language = "en",
targetfile = "cardoso_auroral.pdf",
url = "http://onlinelibrary.wiley.com/doi/10.1002/2016JA023780/full",
urlaccessdate = "20 set. 2024"
}