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Démoulin, P.; Klein, K.-L.; Goff, C.P.; Van Driel-Gesztelyi, L.; Culhane, J.L.; Mandrini, C.H.; Matthews, S.A.; Harra, L.K. "Decametric N burst: A consequence of the interaction of two coronal mass ejections" (2007) Solar Physics. 240(2):301-313
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Abstract:

Radio emissions of electron beams in the solar corona and interplanetary space are tracers of the underlying magnetic configuration and of its evolution. We analyse radio observations from the Culgoora and WIND/WAVES spectrographs, in combination with SOHO/LASCO and SOHO/MDI data, to understand the origin of a type N burst originating from NOAA AR 10540 on January 20, 2004, and its relationship with type II and type III emissions. All bursts are related to the flares and the CME analysed in a previous paper (Goff et al., 2007). A very unusual feature of this event was a decametric type N burst, where a type III-like burst, drifting towards low frequencies (negative drift), changes drift first to positive, then again to negative. At metre wavelengths, i.e., heliocentric distances ≲1.5R ⊙, these bursts are ascribed to electron beams bouncing in a closed loop. Neither U nor N bursts are expected at decametric wavelengths because closed quasi-static loops are not thought to extend to distances ≫1.5R ⊙. We take the opportunity of the good multi-instrument coverage of this event to analyse the origin of type N bursts in the high corona. Reconnection of the expanding ejecta with the magnetic structure of a previous CME, launched about 8 hours earlier, injects electrons in the same manner as with type III bursts but into open field lines having a local dip and apex. The latter shape was created by magnetic reconnection between the expanding CME and neighbouring (open) streamer field lines. This particular flux tube shape in the high corona, between 5R ⊙ and 10R ⊙, explains the observed type N burst. Since the required magnetic configuration is only a transient phenomenon formed by reconnection, severe timing and topological constraints are present to form the observed decametric N burst. They are therefore expected to be rare features. © Springer 2007.

Registro:

Documento: Artículo
Título:Decametric N burst: A consequence of the interaction of two coronal mass ejections
Autor:Démoulin, P.; Klein, K.-L.; Goff, C.P.; Van Driel-Gesztelyi, L.; Culhane, J.L.; Mandrini, C.H.; Matthews, S.A.; Harra, L.K.
Filiación:Observatoire de Paris, LESIA, UMR 8109 (CNRS), 92195 Meudon Principal Cedex, France
Mullard Space Science Laboratory, University College London, Dorking, Surrey, RH5 6NT, United Kingdom
Konkoly Observatory, Hungarian Academy of Sciences, Budapest, Hungary
Instituto de Astronomía y Física del Espacio, CONICET-UBA, CC. 67, Suc. 28, 1428 Buenos Aires, Argentina
Año:2007
Volumen:240
Número:2
Página de inicio:301
Página de fin:313
DOI: http://dx.doi.org/10.1007/s11207-006-0259-2
Título revista:Solar Physics
Título revista abreviado:Sol. Phys.
ISSN:00380938
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v240_n2_p301_Demoulin

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Citas:

---------- APA ----------
Démoulin, P., Klein, K.-L., Goff, C.P., Van Driel-Gesztelyi, L., Culhane, J.L., Mandrini, C.H., Matthews, S.A.,..., Harra, L.K. (2007) . Decametric N burst: A consequence of the interaction of two coronal mass ejections. Solar Physics, 240(2), 301-313.
http://dx.doi.org/10.1007/s11207-006-0259-2
---------- CHICAGO ----------
Démoulin, P., Klein, K.-L., Goff, C.P., Van Driel-Gesztelyi, L., Culhane, J.L., Mandrini, C.H., et al. "Decametric N burst: A consequence of the interaction of two coronal mass ejections" . Solar Physics 240, no. 2 (2007) : 301-313.
http://dx.doi.org/10.1007/s11207-006-0259-2
---------- MLA ----------
Démoulin, P., Klein, K.-L., Goff, C.P., Van Driel-Gesztelyi, L., Culhane, J.L., Mandrini, C.H., et al. "Decametric N burst: A consequence of the interaction of two coronal mass ejections" . Solar Physics, vol. 240, no. 2, 2007, pp. 301-313.
http://dx.doi.org/10.1007/s11207-006-0259-2
---------- VANCOUVER ----------
Démoulin, P., Klein, K.-L., Goff, C.P., Van Driel-Gesztelyi, L., Culhane, J.L., Mandrini, C.H., et al. Decametric N burst: A consequence of the interaction of two coronal mass ejections. Sol. Phys. 2007;240(2):301-313.
http://dx.doi.org/10.1007/s11207-006-0259-2