M. AckermannA. AllafortL. BaldiniG. BarbielliniD. BastieriR. BellazziniE. BissaldiR. BoninoE. BottaciniJ. BregeonP. BruelR. BuehlerR. A. CameronM. CaragiuloP. A. CaraveoE. CavazzutiC. CecchiE. CharlesS. CipriniF. CostanzaS. CutiniF. D'AmmandoF. De PalmaR. DesianteS. W. DigelN. Di LallaM. Di MauroL. Di VenereP. S. DrellC. FavuzziY. FukazawaP. FuscoF. GarganoN. GigliettoF. GiordanoM. GirolettiI. A. GrenierL. GuillemotS. GuiriecT. JoglerG. JóhannessonL. KashapovaS. KruckerM. KussG. La MuraS. LarssonL. LatronicoJ. LiW. LiuF. LongoF. LoparcoP. LubranoJ. D. MagillS. MalderaA. ManfredaM. N. MazziottaW. MitthumsiriT. MizunoM. E. MonzaniA. MorselliI. V. MoskalenkoM. NegroE. NussT. OhsugiN. OmodeiE. OrlandoV. Pal'ShinD. PanequeJ. S. PerkinsM. Pesce-RollinsV. PetrosianF. PironG. PrincipeS. RainòR. RandoDeutsche Elektronen-SynchrotronKavli Institute for Particle Astrophysics and CosmologyUniversità di PisaIstituto Nazionale di Fisica Nucleare, RomaUniversità degli Studi di TriesteIstituto Nazionale Di Fisica Nucleare, Sezione di PadovaUniversità degli Studi di PadovaIstituto Nazionale Di Fisica Nucleare, Sezione di PisaUniversità degli Studi di TorinoLaboratoire Univers et Particules de MontpellierLaboratoire Leprince-RinguetUniversità degli Studi di BariINAF Istituto di Astrofisica Spaziale e Fisica Cosmica, MilanAgenzia Spaziale ItalianaUniversità degli Studi di PerugiaIstituto Di Radioastronomia, BolognaAlma Mater Studiorum Università di BolognaUniversità degli Studi di Napoli Federico IIUniversità degli Studi di UdineHiroshima UniversityUniversite Paris 7- Denis DiderotUniversite d'OrleansInstitut National des Sciences de l'UniversNASA Goddard Space Flight CenterFriedrich-Alexander-Universität Erlangen-NürnbergUniversity Science Institute ReykjavikNordisk Institut for Teoretisk AtomtysikSiberian Branch, Russian Academy of SciencesUniversity of Applied Sciences Northwestern Switzerland, School of EnginneringSpace Sciences Laboratory at UC BerkeleyThe Royal Institute of Technology (KTH)Oskar Klein Centre for Cosmoparticle PhysicsUniversitat Autònoma de BarcelonaBay Area Environmental Research InstituteLockheed Martin CorporationUniversity of MarylandMahidol UniversitySt. PeterburgMax Planck Institut für Physik (Werner-Heisenberg-Institut)Erlangen Centre for Astroparticle PhysicsMedizinische Universitat InnsbruckNYCB Realtime Computing Inc.Nagoya UniversityInstitucio Catalana de Recerca I Estudis Avancats2018-12-212019-03-142018-12-212019-03-142017-02-01Astrophysical Journal. Vol.835, No.2 (2017)153843570004637X2-s2.0-85011999962https://repository.li.mahidol.ac.th/handle/20.500.14594/42478© 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.Mahidol UniversityEarth and Planetary SciencesArticleSCOPUS10.3847/1538-4357/835/2/219