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Tracking of an electron beam through the solar corona with LOFAR

Tracking of an electron beam through the solar corona with LOFAR
Tracking of an electron beam through the solar corona with LOFAR

The Sun's activity leads to bursts of radio emission, among other phenomena. An example is type-III radio bursts. They occur frequently and appear as short-lived structures rapidly drifting from high to low frequencies in dynamic radio spectra. They are usually interpreted as signatures of beams of energetic electrons propagating along coronal magnetic field lines. Here we present novel interferometric LOFAR (LOw Frequency ARray) observations of three solar type-III radio bursts and their reverse bursts with high spectral, spatial, and temporal resolution. They are consistent with a propagation of the radio sources along the coronal magnetic field lines with nonuniform speed. Hence, the type-III radio bursts cannot be generated by a monoenergetic electron beam, but by an ensemble of energetic electrons with a spread distribution in velocity and energy. Additionally, the density profile along the propagation path is derived in the corona. It agrees well with three-fold coronal density model by (1961, ApJ, 133, 983).

Acceleration of particles, Instrumentation: interferometers, Sun: corona, Sun: flares, Sun: radio radiation, Techniques: interferometric
0004-6361
Mann, G.
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Breitling, F.
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Vocks, C.
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Aurass, H.
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Steinmetz, M.
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Strassmeier, K. G.
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Bisi, M. M.
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Fallows, R. A.
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Gallagher, P.
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Kerdraon, A.
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Magdalenic, J.
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Rucker, H.
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Anderson, J.
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Asgekar, A.
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Mann, G.
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Ciardi, B.
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Zensus, J. A.
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Mann, G., Breitling, F., Vocks, C., Aurass, H., Steinmetz, M., Strassmeier, K. G., Bisi, M. M., Fallows, R. A., Gallagher, P., Kerdraon, A., Mackinnon, A., Magdalenic, J., Rucker, H., Anderson, J., Asgekar, A., Avruch, I. M., Bell, M.E., Bentum, M. J., Bernardi, G., Best, P., Bîrzan, L., Bonafede, A., Broderick, J.W., Brüggen, M., Butcher, H. R., Ciardi, B., Corstanje, A., Gasperin, F. De, Geus, E. De, Deller, A., Duscha, S., Eislöffel, J., Engels, D., Falcke, H., Fender, R., Ferrari, C., Frieswijk, W., Garrett, M. A., Grießmeier, J., Gunst, A. W., Haarlem, M. Van, Hassall, T. E., Heald, G., Hessels, J. W.T., Hoeft, M., Hörandel, J., Horneffer, A., Juette, E., Karastergiou, A., Klijn, W. F.A., Kondratiev, V. I., Kramer, M., Kuniyoshi, M., Kuper, G., Maat, P., Markoff, S., McFadden, R., McKay-Bukowski, D., McKean, J. P., Mulcahy, D. D., Munk, H., Nelles, A., Norden, M. J., Orru, E., Paas, H., Pandey-Pommier, M., Pandey, V. N., Pizzo, R., Polatidis, A. G., Rafferty, D., Reich, W., Röttgering, H., Scaife, A. M.M., Schwarz, D. J., Serylak, M., Sluman, J., Smirnov, O., Stappers, B. W., Tagger, M., Tang, Y., Tasse, C., Veen, S. Ter, Thoudam, S., Toribio, M. C., Vermeulen, R., Weeren, R. J.Van, Wise, M. W., Wucknitz, O., Yatawatta, S., Zarka, P. and Zensus, J. A. (2018) Tracking of an electron beam through the solar corona with LOFAR. Astronomy and Astrophysics, 611, [A57]. (doi:10.1051/0004-6361/201629017).

Record type: Article

Abstract

The Sun's activity leads to bursts of radio emission, among other phenomena. An example is type-III radio bursts. They occur frequently and appear as short-lived structures rapidly drifting from high to low frequencies in dynamic radio spectra. They are usually interpreted as signatures of beams of energetic electrons propagating along coronal magnetic field lines. Here we present novel interferometric LOFAR (LOw Frequency ARray) observations of three solar type-III radio bursts and their reverse bursts with high spectral, spatial, and temporal resolution. They are consistent with a propagation of the radio sources along the coronal magnetic field lines with nonuniform speed. Hence, the type-III radio bursts cannot be generated by a monoenergetic electron beam, but by an ensemble of energetic electrons with a spread distribution in velocity and energy. Additionally, the density profile along the propagation path is derived in the corona. It agrees well with three-fold coronal density model by (1961, ApJ, 133, 983).

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More information

Accepted/In Press date: 14 November 2017
e-pub ahead of print date: 27 March 2018
Published date: March 2018
Keywords: Acceleration of particles, Instrumentation: interferometers, Sun: corona, Sun: flares, Sun: radio radiation, Techniques: interferometric
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Identifiers

Local EPrints ID: 422421
URI: http://eprints.soton.ac.uk/id/eprint/422421
DOI: doi:10.1051/0004-6361/201629017
ISSN: 0004-6361
PURE UUID: 2ba0f963-1495-42ac-8f3a-683067eb7d72

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Date deposited: 23 Jul 2018 16:31
Last modified: 17 Mar 2024 12:03

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Contributors

Author: G. Mann
Author: F. Breitling
Author: C. Vocks
Author: H. Aurass
Author: M. Steinmetz
Author: K. G. Strassmeier
Author: M. M. Bisi
Author: R. A. Fallows
Author: P. Gallagher
Author: A. Kerdraon
Author: A. Mackinnon
Author: J. Magdalenic
Author: H. Rucker
Author: J. Anderson
Author: A. Asgekar
Author: I. M. Avruch
Author: M.E. Bell
Author: M. J. Bentum
Author: G. Bernardi
Author: P. Best
Author: L. Bîrzan
Author: A. Bonafede
Author: J.W. Broderick
Author: M. Brüggen
Author: H. R. Butcher
Author: B. Ciardi
Author: A. Corstanje
Author: F. De Gasperin
Author: E. De Geus
Author: A. Deller
Author: S. Duscha
Author: J. Eislöffel
Author: D. Engels
Author: H. Falcke
Author: R. Fender
Author: C. Ferrari
Author: W. Frieswijk
Author: M. A. Garrett
Author: J. Grießmeier
Author: A. W. Gunst
Author: M. Van Haarlem
Author: T. E. Hassall
Author: G. Heald
Author: J. W.T. Hessels
Author: M. Hoeft
Author: J. Hörandel
Author: A. Horneffer
Author: E. Juette
Author: A. Karastergiou
Author: W. F.A. Klijn
Author: V. I. Kondratiev
Author: M. Kramer
Author: M. Kuniyoshi
Author: G. Kuper
Author: P. Maat
Author: S. Markoff
Author: R. McFadden
Author: D. McKay-Bukowski
Author: J. P. McKean
Author: D. D. Mulcahy
Author: H. Munk
Author: A. Nelles
Author: M. J. Norden
Author: E. Orru
Author: H. Paas
Author: M. Pandey-Pommier
Author: V. N. Pandey
Author: R. Pizzo
Author: A. G. Polatidis
Author: D. Rafferty
Author: W. Reich
Author: H. Röttgering
Author: A. M.M. Scaife
Author: D. J. Schwarz
Author: M. Serylak
Author: J. Sluman
Author: O. Smirnov
Author: B. W. Stappers
Author: M. Tagger
Author: Y. Tang
Author: C. Tasse
Author: S. Ter Veen
Author: S. Thoudam
Author: M. C. Toribio
Author: R. Vermeulen
Author: R. J.Van Weeren
Author: M. W. Wise
Author: O. Wucknitz
Author: S. Yatawatta
Author: P. Zarka
Author: J. A. Zensus

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