@Article{HajraTsuEchGonGje:2016:MaStSo,
author = "Hajra, Rakjumar and Tsurutani, Bruce T. and Echer, Ezequiel and
Gonzalez Alarcon, Walter Dem{\'e}trio and Gjerloev, Jesper W.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Jet
Propulsion Laboratory} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)} and {The Johns Hopkins University Applied Physics
Laboratory}",
title = "Supersubstorms (SML <-2500nT): magnetic storm and solar cycle
dependences",
journal = "Journal of Geophysical Research: Space Physics",
year = "2016",
volume = "121",
number = "8",
pages = "7805--7816",
month = "Aug.",
abstract = "We study extremely intense substorms with SuperMAG AL (SML) peak
intensities < -2500 nT ({"}supersubstorms{"}/SSSs) for the period
from 1981 to 2012. The SSS events were often found to be isolated
SML peaks and not statistical fluctuations of the indices. The
SSSs occur during all phases of the solar cycle with the highest
occurrence (3.8 year(-1)) in the descending phase. The SSSs
exhibited an annual variation with equinoctial maximum altering
between spring in solar cycle 22 and fall in solar cycle 23. The
occurrence rate and strength of the SSSs did not show any strong
relationship with the intensity of the associated geomagnetic
storms. All SSS events were associated with strong southward
interplanetary magnetic field B-s component. The B-s fields were
part of interplanetary magnetic clouds in 46% and of
interplanetary sheath fields in 54% of the cases. About 77% of the
SSSs were associated with small regions of very high density solar
wind plasma parcels or pressure pulses impinging upon the
magnetosphere. Comments on how SSS events may cause power outages
at Earth are discussed at the end of the paper.",
doi = "10.1002/2015JA021835",
url = "http://dx.doi.org/10.1002/2015JA021835",
issn = "2169-9402",
language = "en",
targetfile = "hajra-subt.pdf",
urlaccessdate = "28 abr. 2024"
}