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Title: Fermi-LAT Observations of High-energy Behind-the-limb Solar Flares
Authors: M. Ackermann
A. Allafort
L. Baldini
G. Barbiellini
D. Bastieri
R. Bellazzini
E. Bissaldi
R. Bonino
E. Bottacini
J. Bregeon
P. Bruel
R. Buehler
R. A. Cameron
M. Caragiulo
P. A. Caraveo
E. Cavazzuti
C. Cecchi
E. Charles
S. Ciprini
F. Costanza
S. Cutini
F. D'Ammando
F. De Palma
R. Desiante
S. W. Digel
N. Di Lalla
M. Di Mauro
L. Di Venere
P. S. Drell
C. Favuzzi
Y. Fukazawa
P. Fusco
F. Gargano
N. Giglietto
F. Giordano
M. Giroletti
I. A. Grenier
L. Guillemot
S. Guiriec
T. Jogler
G. Jóhannesson
L. Kashapova
S. Krucker
M. Kuss
G. La Mura
S. Larsson
L. Latronico
J. Li
W. Liu
F. Longo
F. Loparco
P. Lubrano
J. D. Magill
S. Maldera
A. Manfreda
M. N. Mazziotta
W. Mitthumsiri
T. Mizuno
M. E. Monzani
A. Morselli
I. V. Moskalenko
M. Negro
E. Nuss
T. Ohsugi
N. Omodei
E. Orlando
V. Pal'Shin
D. Paneque
J. S. Perkins
M. Pesce-Rollins
V. Petrosian
F. Piron
G. Principe
S. Rainò
R. Rando
Deutsche Elektronen-Synchrotron
Kavli Institute for Particle Astrophysics and Cosmology
Università di Pisa
Istituto Nazionale di Fisica Nucleare, Roma
Università degli Studi di Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione di Padova
Università degli Studi di Padova
Istituto Nazionale Di Fisica Nucleare, Sezione di Pisa
Università degli Studi di Torino
Laboratoire Univers et Particules de Montpellier
Laboratoire Leprince-Ringuet
Università degli Studi di Bari
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
Agenzia Spaziale Italiana
Università degli Studi di Perugia
Istituto Di Radioastronomia, Bologna
Alma Mater Studiorum Università di Bologna
Università degli Studi di Napoli Federico II
Università degli Studi di Udine
Hiroshima University
Universite Paris 7- Denis Diderot
Universite d'Orleans
Institut National des Sciences de l'Univers
NASA Goddard Space Flight Center
Friedrich-Alexander-Universität Erlangen-Nürnberg
University Science Institute Reykjavik
Nordisk Institut for Teoretisk Atomtysik
Siberian Branch, Russian Academy of Sciences
University of Applied Sciences Northwestern Switzerland, School of Enginnering
Space Sciences Laboratory at UC Berkeley
The Royal Institute of Technology (KTH)
Oskar Klein Centre for Cosmoparticle Physics
Universitat Autònoma de Barcelona
Bay Area Environmental Research Institute
Lockheed Martin Corporation
University of Maryland
Mahidol University
St. Peterburg
Max Planck Institut für Physik (Werner-Heisenberg-Institut)
Erlangen Centre for Astroparticle Physics
Medizinische Universitat Innsbruck
NYCB Realtime Computing Inc.
Nagoya University
Institucio Catalana de Recerca I Estudis Avancats
Keywords: Earth and Planetary Sciences
Issue Date: 1-Feb-2017
Citation: Astrophysical Journal. Vol.835, No.2 (2017)
Abstract: © 2017. The American Astronomical Society. All rights reserved. We report on the Fermi-LAT detection of high-energy emission from the behind-the-limb (BTL) solar flares that occurred on 2013 October 11, and 2014 January 6 and September 1. The Fermi-LAT observations are associated with flares from active regions originating behind both the eastern and western limbs, as determined by STEREO. All three flares are associated with very fast coronal mass ejections (CMEs) and strong solar energetic particle events. We present updated localizations of the >100 MeV photon emission, hard X-ray (HXR) and EUV images, and broadband spectra from 10 keV to 10 GeV, as well as microwave spectra. We also provide a comparison of the BTL flares detected by Fermi-LAT with three on-disk flares and present a study of some of the significant quantities of these flares as an attempt to better understand the acceleration mechanisms at work during these occulted flares. We interpret the HXR emission to be due to electron bremsstrahlung from a coronal thin-target loop top with the accelerated electron spectra steepening at semirelativistic energies. The >100 MeV gamma-rays are best described by a pion-decay model resulting from the interaction of protons (and other ions) in a thick-target photospheric source. The protons are believed to have been accelerated (to energies >10 GeV) in the CME environment and precipitate down to the photosphere from the downstream side of the CME shock and landed on the front side of the Sun, away from the original flare site and the HXR emission.
ISSN: 15384357
Appears in Collections:Scopus 2016-2017

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