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Type: Artigo de Periódico
Title: Signals At Ground Level Of Relativistic Solar Particles Associated With A Radiation Storm On 2014 April 18
Author: Augusto
C; Navia
C; de Oliveira
MN; Fauth
A; Nepomuceno
Abstract: Active region NOAA AR2036, located at S20W34 at the Sun disk, produced a moderately strong (GOES class M7.3) flare on 2014 April 18. The flare itself was long in duration, and a halo coronal mass ejection (CME) was emitted. In addition, a radiation storm, that is, solar energetic particles (SEP), began to reach the Earth at 13: 30 UT in the aftermath of the solar blast, meeting the condition of an S1 (minor) radiation storm level. In temporal coincidence with the onset of the S1 radiation storm, the Tupi telescopes located within the South Atlantic Anomaly (SAA) detected a fast rise in the muon counting rate, caused by relativistic protons from this solar blast, with a confidence of up to 3.5% at peak. At the time of the solar blast, of all ground-based detectors, the Tupi telescopes had the best geoeffective location. Indeed, in association with the radiation storm, a gradual increase in the particle intensity was found in some neutron monitors (NMs), all of them in the west region relative to the Sun-Earth line, yet within the geoeffective region. However, their confidence levels are smaller: up to 3%. The fast rising observed at Tupi suggests possible detection of solar particles emitted during the impulsive phase, following by a gradual phase observed also at NMs. Details of these observations, including the expected energy spectrum, are reported.
Subject: Astroparticle Physics
Methods: Observational
Sun: Flares
Solar-terrestrial Relations
Citation: Publications Of The Astronomical Society Of Japan. OXFORD UNIV PRESS, n. 68, n. 1, p. .
Rights: fechado
Identifier DOI: 10.1093/pasj/psv111
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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