@InProceedings{AlvesSilSilSibWyg:2019:HoDoOu,
author = "Alves, Livia Ribeiro and Silva, Graziela Belmira Dias da and
Silva, Ligia Alves da and Sibeck, David G. and Wygant, John R.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {NASA Goddard Space Flight Center}
and {University of Minnesota}",
title = "How Does The Outer Radiation Belt Change Under Recurrent Solar
Wind Structures?",
year = "2019",
organization = "AGU Fall Meeting",
abstract = "The key question on the Earth's radiation belts trapped particles
lies on the understanding of how solar wind drives the
magnetospheric physical mechanisms changing the trapped particle
populations. In particular, in this study we are interested in
describing the electron flux changes under interplanetary medium
conditions determined by recurrent interplanetary structures. We
identified 46 Corotating Interaction Regions (CIRs) throughout the
descending phase of the solar cycle 24. Losses of relativistic
electrons are observed in 61% of the events. To evaluate the
physical mechanisms involved with these dropouts, we choose a CIR
event that recurred through at least seven solar rotations. The
first passage started on 30 October 2017 and the seventh on 05 May
2018. Since the interplanetary conditions slightly change in each
solar wind rotation, the outer radiation belt dynamics also
changes. We identify recurrent characteristics, e.g. the increase
of ultra-low frequency (ULF) waves activity during each CIR's
passage, the time-step required for the outer radiation belt
recovery of about two days after the CIR's arrival, and the
increase of low energy particle flux prior to this recovery. The
outer radiation belt flux decreases in four of the seven passages
studied, dayside magnetosphere is eventually compressed, and ULF
waves are observed in a broad range of frequencies from Pc3 to
Pc5, which is likely to persist for days. The results obtained
give a description of the physical mechanisms occurring in the
recurrent CIR-magnetosphere coupling, which can provide subsidies
to improve outer radiation belt electron flux modeling and
forecasting accuracy.",
conference-location = "San Francisco, CA",
conference-year = "09-13 dec.",
language = "en",
targetfile = "alves_how.pdf",
urlaccessdate = "03 jun. 2024"
}