Imaging spectroscopy of solar radio burst fine structures
| Autor: | Kontar, E.P., Yu, S., Kuznetsov, A.A., Emslie, A.G., Alcock, B., Jeffrey, N.L.S., Melnik, V.N., Bian, N.H., Subramanian, P. |
|---|---|
| Přispěvatelé: | University of Glasgow, New Jersey Institute of Technology [Newark] (NJIT), Institute of Solar-Terrestrial Physics [Irkutsk] (ISTP), Siberian Branch of the Russian Academy of Sciences (SB RAS), Western Kentucky University (WKU), SUPA School of Physics and Astronomy [Glasgow], Institute of Radio Astronomy of NASU [Kharkiv] (IRA), National Academy of Sciences of Ukraine (NASU), Institut de Recherche Interdisciplinaire [Villeneuve d'Ascq] (IRI), Centre National de la Recherche Scientifique (CNRS)-Université de Lille, Droit et Santé-Université de Lille, Sciences et Technologies, Indian Institute of Science Education and Research Pune (IISER Pune) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
F300
Science Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences F500 Astrophysics::Cosmology and Extragalactic Astrophysics Article Physics - Space Physics Astrophysics::Solar and Stellar Astrophysics lcsh:Science Solar and Stellar Astrophysics (astro-ph.SR) High Energy Astrophysical Phenomena (astro-ph.HE) [PHYS]Physics [physics] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] Space Physics (physics.space-ph) Physics - Plasma Physics Plasma Physics (physics.plasm-ph) Astrophysics - Solar and Stellar Astrophysics [SDU]Sciences of the Universe [physics] Physics::Space Physics lcsh:Q Astrophysics::Earth and Planetary Astrophysics [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Astrophysics - High Energy Astrophysical Phenomena |
| Zdroj: | Nature Communications Nature Communications, Vol 8, Iss 1, Pp 1-9 (2017) Nature Communications, Nature Publishing Group, 2017, 8 (1), ⟨10.1038/s41467-017-01307-8⟩ NASA Astrophysics Data System |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/s41467-017-01307-8⟩ |
| Popis: | Solar radio observations provide a unique diagnostic of the outer solar atmosphere. However, the inhomogeneous turbulent corona strongly affects the propagation of the emitted radio waves, so decoupling the intrinsic properties of the emitting source from the effects of radio-wave propagation has long been a major challenge in solar physics. Here we report quantitative spatial and frequency characterization of solar radio burst fine structures observed with the LOw Frequency Array (LOFAR), an instrument with high time resolution that also permits imaging at scales much shorter than those corresponding to radio-wave propagation in the corona. The observations demonstrate that radio-wave propagation effects, and not the properties of the intrinsic emission source, dominate the observed spatial characteristics of radio burst images. These results permit more accurate estimates of source brightness temperatures, and open opportunities for quantitative study of the mechanisms that create the turbulent coronal medium through which the emitted radiation propagates. 20 pages, 9 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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