Publication:
Fermi-LAT Observations of High-energy Behind-the-limb Solar Flares

Issued Date

2017-02-01

Resource Type

Article

ISSN

15384357
0004637X

DOI

10.3847/1538-4357/835/2/219

Other identifier(s)

2-s2.0-85011999962

Rights

Mahidol University

Rights Holder(s)

SCOPUS

Bibliographic Citation

Astrophysical Journal. Vol.835, No.2 (2017)

Suggested Citation

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 Fermi-LAT Observations of High-energy Behind-the-limb Solar Flares. Astrophysical Journal. Vol.835, No.2 (2017). doi:10.3847/1538-4357/835/2/219 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/42478

Research Projects

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Thesis

Title

Fermi-LAT Observations of High-energy Behind-the-limb Solar Flares

Author(s)

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

Other Contributor(s)

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

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.

Keyword(s)

Earth and Planetary Sciences

Availability

URI

https://repository.li.mahidol.ac.th/handle/20.500.14594/42478

Collections

Scopus 2016-2017