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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/26723
Title: Fermi-LAT Observations of High-energy Behind-the-limb Solar Flares
Authors: Ackermann, M.
Allafort, A.
Baldini, L.
Barbiellini, G.
Bastieri, D.
Bellazzini, R.
Bissaldi, E.
Bonino, R.
Bottacini, E.
Bregeon, J.
Bruel, P.
Buehler, R.
Cameron, R. A.
Caragiulo, M.
CARAVEO, PATRIZIA 
Cavazzuti, E.
Cecchi, C.
Charles, E.
Ciprini, S.
Costanza, F.
Cutini, S.
D'AMMANDO, FILIPPO 
de Palma, F.
Desiante, R.
Digel, S. W.
Di Lalla, N.
Di Mauro, M.
Di Venere, L.
Drell, P. S.
Favuzzi, C.
Fukazawa, Y.
Fusco, P.
Gargano, F.
Giglietto, N.
Giordano, F.
GIROLETTI, MARCELLO 
Grenier, I. A.
Guillemot, L.
Guiriec, S.
Jogler, T.
Jóhannesson, G.
Kashapova, L.
Krucker, S.
Kuss, M.
La Mura, G.
Larsson, S.
Latronico, L.
Li, J.
Liu, W.
Longo, F.
Loparco, F.
Lubrano, P.
Magill, J. D.
Maldera, S.
Manfreda, A.
Mazziotta, M. N.
Mitthumsiri, W.
Mizuno, T.
Monzani, M. E.
Morselli, A.
Moskalenko, I. V.
Negro, M.
Nuss, E.
Ohsugi, T.
Omodei, N.
Orlando, E.
Pal'shin, V.
Paneque, D.
Perkins, J. S.
Pesce-Rollins, M.
Petrosian, V.
Piron, F.
Principe, G.
Rainò, S.
Rando, R.
Razzano, M.
Reimer, O.
Rubio da Costa, F.
Sgrò, C.
Simone, D.
Siskind, E. J.
Spada, F.
Spandre, G.
Spinelli, P.
Tajima, H.
Thayer, J. B.
Torres, D. F.
Troja, E.
Vianello, G.
Issue Date: 2017
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 835
Issue: 2
First Page: 219
Abstract: 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.
URI: http://hdl.handle.net/20.500.12386/26723
URL: https://iopscience.iop.org/article/10.3847/1538-4357/835/2/219/meta
ISSN: 0004-637X
DOI: 10.3847/1538-4357/835/2/219
Bibcode ADS: 2017ApJ...835..219A
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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