@Article{AugustoNONRTMFSKS:2018:OnMaGe,
author = "Augusto, C. R. A. and Navia, C. E. and Oliveira, M. N. de and
Nepomuceno, A. A. and Raulin, J. P. and Tueros, E. and
Mendon{\c{c}}a, Rafael Rodrigues Souza de and Fauth, A. C. and
Souza, H. Vieira de and Kopenkin, V. and Sinzi, T.",
affiliation = "{Universidade Federal Fluminense (UFF)} and {Universidade Federal
Fluminense (UFF)} and {Universidade Federal Fluminense (UFF)} and
{Universidade Federal Fluminense (UFF)} and {Universidade
Presbiteriana Mackenzie} and {Universidade Presbiteriana
Mackenzie} and {Instituto Nacional de Pesquisas Espaciais (INPE)}
and {Universidade Estadual de Campinas (UNICAMP)} and
{Universidade Estadual de Campinas (UNICAMP)} and {Waseda
University} and {Rikkyo University}",
title = "The 2015 summer solstice storm: one of the major geomagnetic
storms of solar cycle 24 observed at ground level",
journal = "Solar Physics",
year = "2018",
volume = "293",
number = "5",
pages = "e84",
keywords = "Sun: activity · Astroparticle physics · Atmospheric effects ·
Instrumentation: detectors.",
abstract = "We report on the 22 23 June 2015 geomagnetic storm that occurred
at the summer solstice. There have been fewer intense geomagnetic
storms during the current solar cycle, Solar Cycle 24, than in the
previous cycle. This situation changed after mid-June 2015, when
one of the largest solar active regions (AR 12371) of Solar Cycle
24 that was located close to the central meridian, produced
several coronal mass ejections (CMEs) associated with M-class
flares. The impact of these CMEs on the Earths magnetosphere
resulted in a moderate to severe G4-class geomagnetic storm on 22
23 June 2015 and a G2 (moderate) geomagnetic storm on 24 June. The
G4 solstice storm was the second largest (so far) geomagnetic
storm of Cycle 24. We highlight the ground-level observations made
with the New-Tupi, Muonca, and the CARPET El Leoncito cosmic-ray
detectors that are located within the South Atlantic Anomaly (SAA)
region. These observations are studied in correlation with data
obtained by space-borne detectors (ACE, GOES, SDO, and SOHO) and
other ground-based experiments. The CME designations are taken
from the Computer Aided CME Tracking (CACTus) automated catalog.
As expected, Forbush decreases (FD) associated with the passing
CMEs were recorded by these detectors. We note a peculiar feature
linked to a severe geomagnetic storm event. The 21 June 2015 CME
0091 (CACTus CME catalog number) was likely associated with the 22
June summer solstice FD event. The angular width of CME 0091 was
very narrow and measured \∼56\∘ degrees seen from
Earth. In most cases, only CME halos and partial halos lead to
severe geomagnetic storms. We perform a cross-check analysis of
the FD events detected during the rise phase of Solar Cycle 24,
the geomagnetic parameters, and the CACTus CME catalog. Our study
suggests that narrow angular-width CMEs that erupt in a westward
direction from the SunEarth line can lead to moderate and severe
geomagnetic storms. We also report on the strong solar proton
radiation storm that began on 21 June. We did not find a signal
from this SEP at ground level. The details of these observations
are presented.",
doi = "10.1007/s11207-018-1303-8",
url = "http://dx.doi.org/10.1007/s11207-018-1303-8",
issn = "0038-0938 and 1573-093X",
language = "en",
targetfile = "augusto_2015.pdf",
urlaccessdate = "29 mar. 2024"
}