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LOFAR tied-array im...
LOFAR tied-array imaging and spectroscopy of solar S bursts
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- Morosan, D. E. (författare)
- Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland.
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- Gallagher, P. T. (författare)
- Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland.
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- Zucca, P. (författare)
- Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland.
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visa fler...
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- O'Flannagain, A. (författare)
- Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland.
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- Fallows, R. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.
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- Reid, H. (författare)
- Univ Glasgow, SUPA, Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland.
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- Magdalenic, J. (författare)
- Royal Observ Belgium, SIDC, Solar Terr Ctr Excellence, B-1180 Brussels, Belgium.
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- Mann, G. (författare)
- Leibniz Inst Astrophys Potsdam AIR, D-14482 Potsdam, Germany.
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- Bisi, M. M. (författare)
- Harwell Oxford, RAE Space Sci & Technol Facil Council, Rutherford Appleton Lab, Oxford OX11 OQX, Oxon, England.
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- Kerdraon, A. (författare)
- Observ Paris, LESIA, UMR 8109, CNRS, F-92195 Meudon, France.
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- Konovalenko, A. A. (författare)
- Inst Radio Astron, UA-61002 Kharkov, Ukraine.
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- MacKinnon, A. L. (författare)
- Univ Glasgow, SUPA, Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland.
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- Rucker, H. O. (författare)
- Austrian Acad Sci, Commiss Astron, A-8042 Graz, Austria.
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- Thidé, Bo (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Vocks, C. (författare)
- Leibniz Inst Astrophys Potsdam AIR, D-14482 Potsdam, Germany.
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- Alexov, A. (författare)
- Space Telescope Sci Inst, Baltimore, MD 21218 USA.
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- Anderson, J. (författare)
- Hehnholtz Zentrum Potsdam, DeutschesGeoForschunesZentrum GFZ, Dept Geodesy & Remote Sensing 1, D-14473 Potsdam, Germany.
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- Asgekar, A. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.;Shell Technol Ctr, Bangalore 560099, Karnataka, India.
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- Avruch, I. M. (författare)
- SRON Netherlands Inst Space Res, NL-9700 AV Groningen, Netherlands.;Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands.
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- Bentum, M. J. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.;Univ Twente, NL-7522 NB Enxhede, Netherlands.
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- Bernardi, G. (författare)
- Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA.
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- Bonafede, A. (författare)
- Univ Hamburg, D-21029 Hamburg, Germany.
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- Breitling, F. (författare)
- Leibniz Inst Astrophys Potsdam AIR, D-14482 Potsdam, Germany.
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- Broderick, J. W. (författare)
- Univ Oxford, Astrophys, Oxford OX1 3RH, England.;Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England.
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- Brouw, W. N. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.;Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands.
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- Butcher, H. R. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Mt Stromlo Obs, Weston, ACT 2611, Australia.
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- Ciardi, B. (författare)
- Max Planck Inst Astrophys, D-85741 Garching, Germany.
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- de Geus, E. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.;SmarterVision BV, NL-9401 JX Assen, Netherlands.
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- Eisloeffel, J. (författare)
- Thnringer Landessternwarte, D-07778 Tautenburg, Germany.
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- Falcke, H. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.;Radboud Univ Nijmegen, Dept Astrophys IMAPP, NL-6500 GL Nijmegen, Netherlands.
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- Frieswijk, W. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.
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- Garrett, M. A. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.;Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands.
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- Griessmeier, J. (författare)
- Univ Orleans, CNRS, LPC2E, F-45071 Orleans 2, France.;Univ Orleans, Stn Radioastron Nancay, Observ Paris, CNRS,INSU,USR 704,OSUC, F-18330 Nancay, France.
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- Gunst, A. W. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.
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- Hessels, J. W. T. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.;Univ Amsterdam, Anton Pannekoek Inst, NL-1090 GE Amsterdam, Netherlands.
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- Hoeft, M. (författare)
- Thnringer Landessternwarte, D-07778 Tautenburg, Germany.
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- Karastergiou, A. (författare)
- Univ Oxford, Astrophys, Oxford OX1 3RH, England.
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- Kondratiev, V. I. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.;PN Lebedev Phys Inst, Ctr Astro Space, Moscow 117997, Russia.
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- Kuper, G. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.
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- van Leeuwen, J. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.;Univ Amsterdam, Anton Pannekoek Inst, NL-1090 GE Amsterdam, Netherlands.
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- McKay-Bukowski, D. (författare)
- Univ Oulu, Sodankyla Geophys Observ, Sodankyla 99600, Finland.;STFC Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England.
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- McKean, J. P. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.;Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands.
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- Munk, H. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.
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- Orru, E. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.
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- Paas, H. (författare)
- Univ Groningen, CIT, NL-9700 CA Groningen, Netherlands.
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- Pizzo, R. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.
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- Polatidis, A. G. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.
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- Scaife, A. M. M. (författare)
- Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England.
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- Sluman, J. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.
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- Tasse, C. (författare)
- Observ Paris, LESIA, UMR 8109, CNRS, F-92195 Meudon, France.
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- Toribio, M. C. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.
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- Vermeulen, R. (författare)
- Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands.
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- Zarka, P. (författare)
- Observ Paris, LESIA, UMR 8109, CNRS, F-92195 Meudon, France.
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Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands. (creator_code:org_t)
- 2015-08-03
- 2015
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 580
- Relaterad länk:
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https://www.aanda.or...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Context. The Sun is an active source of radio emission that is often associated with energetic phenomena ranging from nanoflares to coronal mass ejections (CMEs). At low radio frequencies (<100 MHz), numerous millisecond duration radio bursts have been reported, such as radio spikes or solar S bursts (where S stands for short). To date, these have neither been studied extensively nor imaged because of the instrumental limitations of previous radio telescopes. Aims. Here, LOw Frequency ARray (LOFAR) observations were used to study the spectral and spatial characteristics of a multitude of S bursts, as well as their origin and possible emission mechanisms. Methods. We used 170 simultaneous tied-array beams for spectroscopy and imaging of S bursts. Since S bursts have short timescales and fine frequency structures, high cadence (similar to 50 ms) tied-array images were used instead of standard interferometric imaging, that is currently limited to one image per second. Results. On 9 July 2013, over 3000 S bursts were observed over a time period of similar to 8 h. S bursts were found to appear as groups of short-lived (<1 s) and narrow-bandwidth (similar to 2.5 MHz) features, the majority drifting at similar to 3.5 MHz s(-1) and a wide range of circular polarisation degrees (2-8 times more polarised than the accompanying Type III bursts). Extrapolation of the photospheric magnetic field using the potential field source surface (PFSS) model suggests that S bursts are associated with a trans-equatorial loop system that connects an active region in the southern hemisphere to a bipolar region of plage in the northern hemisphere. Conclusions. We have identified polarised, short-lived solar radio bursts that have never been imaged before. They are observed at a height and frequency range where plasma emission is the dominant emission mechanism, however, they possess some of the characteristics of electron-cyclotron maser emission.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- Sun: corona
- Sun: radio radiation
- Sun: particle emission
- Sun: magnetic fields
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- art (ämneskategori)
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- Av författaren/redakt...
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Morosan, D. E.
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Gallagher, P. T.
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Zucca, P.
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O'Flannagain, A.
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Fallows, R.
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Reid, H.
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visa fler...
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Magdalenic, J.
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Mann, G.
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Bisi, M. M.
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Kerdraon, A.
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Konovalenko, A. ...
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MacKinnon, A. L.
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Rucker, H. O.
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Thidé, Bo
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Vocks, C.
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Alexov, A.
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Anderson, J.
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Asgekar, A.
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Avruch, I. M.
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Bentum, M. J.
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Bernardi, G.
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Bonafede, A.
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Breitling, F.
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Broderick, J. W.
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Brouw, W. N.
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Butcher, H. R.
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Ciardi, B.
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de Geus, E.
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Eisloeffel, J.
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Falcke, H.
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Frieswijk, W.
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Garrett, M. A.
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Griessmeier, J.
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Gunst, A. W.
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Hessels, J. W. T ...
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Hoeft, M.
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Karastergiou, A.
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Kondratiev, V. I ...
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Kuper, G.
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van Leeuwen, J.
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McKay-Bukowski, ...
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McKean, J. P.
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Munk, H.
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Orru, E.
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Paas, H.
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Pizzo, R.
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Polatidis, A. G.
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Scaife, A. M. M.
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Sluman, J.
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Tasse, C.
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Toribio, M. C.
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Vermeulen, R.
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Zarka, P.
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NATURVETENSKAP
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och Fysik
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och Astronomi astrof ...
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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och Fusion plasma oc ...
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Astronomy and As ...
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Uppsala universitet