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Solar flares at submillimeter wavelengths

Krucker, Säm ; Giménez de Castro, C. ; Hudson, H. ; Trottet, G. ; Bastian, T. ; Hales, A. ; Kašparová, J. ; Klein, K.-L ; Kretzschmar, M. ; Lüthi, T. ; Mackinnon, A. ; Pohjolainen, S. ; White, S.

In: The Astronomy and Astrophysics Review, 2013, vol. 21, no. 1, p. 1-45

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    Titre
    • Solar flares at submillimeter wavelengths
    Auteur
    • Krucker, Säm. Institute of 4D Technologies, School of Engineering, University of Applied Sciences and Arts Northwestern Switzerland, 5210, Windisch, Switzerland
    • Giménez de Castro, C.. CRAAM, Universidade Presbiteriana Mackenzie, 01302-907, São Paulo, SP, Brazil
    • Hudson, H.. Space Sciences Laboratory, University of California, 94720-7450, Berkeley, CA, USA
    • Trottet, G.. Observatoire de Paris, LESIA, CNRS-UMR, 8109, Meudon, France
    • Bastian, T.. National Radio Astronomy Observatory, 22903, Charlottesville, VA, USA
    • Hales, A.. National Radio Astronomy Observatory, 22903, Charlottesville, VA, USA
    • Kašparová, J.. Astronomical Institute of the Academy of Sciences of the Czech Republic, 25165, Ondřejov, Czech Republic
    • Klein, K.-L. Observatoire de Paris, LESIA, CNRS-UMR, 8109, Meudon, France
    • Kretzschmar, M.. LPC2E, UMR 6115 CNRS et Université d'Orléans, Orléans Cedex 2, France
    • Lüthi, T.. Leica Geosystem AG, Hexagon Metrology, Moenchmattweg 5, 5035, Unterentfelden, Switzerland
    • Mackinnon, A.. DACE/Department of Physics and Astronomy, University of Glasgow, Glasgow, UK
    • Pohjolainen, S.. Department of Physics and Astronomy, Tuorla Observatory, University of Turku, 21500, Piikkiö, Finland
    • White, S.. Space Vehicles Directorate, AFRL, Kirtland AFB, 87117, Albuquerque, NM, USA
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • The Astronomy and Astrophysics Review, 2013, vol. 21, no. 1, p. 1-45. Springer Berlin Heidelberg
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:309953
    Summary
    We discuss the implications of the first systematic observations of solar flares at submillimeter wavelengths, defined here as observing wavelengths shorter than 3mm (frequencies higher than 0.1THz). The events observed thus far show that this wave band requires a new understanding of high-energy processes in solar flares. Several events, including observations from two different observatories, show during the impulsive phase of the flare a spectral component with a positive (increasing) slope at the highest observable frequencies (up to 405GHz). To emphasize the increasing spectra and the possibility that these events could be even more prominent in the THz range, we term this spectral feature a "THz component”. Here we review the data and methods, and critically assess the observational evidence for such distinct component(s). This evidence is convincing. We also review the several proposed explanations for these feature(s), which have been reported in three distinct flare phases. These data contain important clues to flare development and particle acceleration as a whole, but many of the theoretical issues remain open. We generally have lacked systematic observations in the millimeter-wave to far-infrared range that are needed to complete our picture of these events, and encourage observations with new facilities