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http://hdl.handle.net/20.500.12386/27778
Titolo: | Low Altitude Solar Magnetic Reconnection, Type III Solar Radio Bursts, and X-ray Emissions | Autori: | Cairns, I. H. Lobzin, V. V. Donea, A. Tingay, S. J. McCauley, P. I. Oberoi, D. Duffin, R. T. Reiner, M. J. Hurley-Walker, N. Kudryavtseva, N. A. Melrose, D. B. Harding, J. C. BERNARDI, GIANNI Bowman, J. D. Cappallo, R. J. Corey, B. E. Deshpande, A. Emrich, D. Goeke, R. Hazelton, B. J. Johnston-Hollitt, M. Kaplan, D. L. Kasper, J. C. Kratzenberg, E. Lonsdale, C. J. Lynch, M. J. McWhirter, S. R. Mitchell, D. A. Morales, M. F. Morgan, E. Ord, S. M. Prabu, T. Roshi, A. Shankar, N. Udaya Srivani, K. S. Subrahmanyan, R. Wayth, R. B. Waterson, M. Webster, R. L. Whitney, A. R. Williams, A. Williams, C. L. |
Data pubblicazione: | 2018 | Rivista: | SCIENTIFIC REPORTS | Numero: | 8 | Da pagina:: | 1676 | Abstract: | Type III solar radio bursts are the Sun's most intense and frequent nonthermal radio emissions. They involve two critical problems in astrophysics, plasma physics, and space physics: how collective processes produce nonthermal radiation and how magnetic reconnection occurs and changes magnetic energy into kinetic energy. Here magnetic reconnection events are identified definitively in Solar Dynamics Observatory UV-EUV data, with strong upward and downward pairs of jets, current sheets, and cusp-like geometries on top of time-varying magnetic loops, and strong outflows along pairs of open magnetic field lines. Type III bursts imaged by the Murchison Widefield Array and detected by the Learmonth radiospectrograph and STEREO B spacecraft are demonstrated to be in very good temporal and spatial coincidence with specific reconnection events and with bursts of X-rays detected by the RHESSI spacecraft. The reconnection sites are low, near heights of 5-10 Mm. These images and event timings provide the long-desired direct evidence that semi-relativistic electrons energized in magnetic reconnection regions produce type III radio bursts. Not all the observed reconnection events produce X-ray events or coronal or interplanetary type III bursts; thus different special conditions exist for electrons leaving reconnection regions to produce observable radio, EUV, UV, and X-ray bursts. | URI: | http://hdl.handle.net/20.500.12386/27778 | URL: | https://www.nature.com/articles/s41598-018-19195-3 | ISSN: | 2045-2322 | DOI: | 10.1038/s41598-018-19195-3 | Bibcode ADS: | 2018NatSR...8.1676C | Fulltext: | open |
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