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Attrill, G.D.R.; Van Driel-Gesztelyi, L.; Démoulin, P.; Zhukov, A.N.; Steed, K.; Harra, L.K.; Mandrini, C.H.; Linker, J. "The recovery of CME-related dimmings and the ICME's enduring magnetic connection to the Sun" (2008) Solar Physics. 252(2):349-372
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Abstract:

It is generally accepted that transient coronal holes (TCHs, dimmings) correspond to the magnetic footpoints of CMEs that remain rooted in the Sun as the CME expands out into the interplanetary space. However, the observation that the average intensity of the 12 May 1997 dimmings recover to their pre-eruption intensity in SOHO/EIT data within 48 hours, whilst suprathermal unidirectional electron heat fluxes are observed at 1 AU in the related ICME more than 70 hours after the eruption, leads us to question why and how the dimmings disappear whilst the magnetic connectivity is maintained. We also examine two other CME-related dimming events: 13 May 2005 and 6 July 2006. We study the morphology of the dimmings and how they recover. We find that, far from exhibiting a uniform intensity, dimmings observed in SOHO/EIT data have a deep central core and a more shallow extended dimming area. The dimmings recover not only by shrinking of their outer boundaries but also by internal brightenings. We quantitatively demonstrate that the model developed by Fisk and Schwadron (Astrophys. J. 560, 425, 2001) of interchange reconnections between "open" magnetic field and small coronal loops is a strong candidate for the mechanism facilitating the recovery of the dimmings. This process disperses the concentration of ∈"open" magnetic field (forming the dimming) out into the surrounding quiet Sun, thus recovering the intensity of the dimmings whilst still maintaining the magnetic connectivity to the Sun. © 2008 Springer Science+Business Media B.V.

Registro:

Documento: Artículo
Título:The recovery of CME-related dimmings and the ICME's enduring magnetic connection to the Sun
Autor:Attrill, G.D.R.; Van Driel-Gesztelyi, L.; Démoulin, P.; Zhukov, A.N.; Steed, K.; Harra, L.K.; Mandrini, C.H.; Linker, J.
Filiación:Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, United Kingdom
Observatoire de Paris, LESIA, UMR 8109 (CNRS), Meudon Principal Cedex 92195, France
Konkoly Observatory of the Hungarian Academy of Sciences, Budapest, Hungary
Solar-Terrestrial Center of Excellence - SIDC, Royal Observatory of Belgium, Avenue Circulaire 3, Brussels 1180, Belgium
Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow 119992, Russian Federation
Instituto de Astronomía Y Física del Espacio, CONICET-UBA, CC. 67, Suc. 28, Buenos Aires 1428, Argentina
Science Applications International Corporation, 10260 Campus Point Drive, San Diego, CA 92121, United States
Palabras clave:Corona; Coronal mass ejections; Low coronal signatures; Magnetic fields; Quiet Sun
Año:2008
Volumen:252
Número:2
Página de inicio:349
Página de fin:372
DOI: http://dx.doi.org/10.1007/s11207-008-9255-z
Título revista:Solar Physics
Título revista abreviado:Sol. Phys.
ISSN:00380938
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v252_n2_p349_Attrill

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Citas:

---------- APA ----------
Attrill, G.D.R., Van Driel-Gesztelyi, L., Démoulin, P., Zhukov, A.N., Steed, K., Harra, L.K., Mandrini, C.H.,..., Linker, J. (2008) . The recovery of CME-related dimmings and the ICME's enduring magnetic connection to the Sun. Solar Physics, 252(2), 349-372.
http://dx.doi.org/10.1007/s11207-008-9255-z
---------- CHICAGO ----------
Attrill, G.D.R., Van Driel-Gesztelyi, L., Démoulin, P., Zhukov, A.N., Steed, K., Harra, L.K., et al. "The recovery of CME-related dimmings and the ICME's enduring magnetic connection to the Sun" . Solar Physics 252, no. 2 (2008) : 349-372.
http://dx.doi.org/10.1007/s11207-008-9255-z
---------- MLA ----------
Attrill, G.D.R., Van Driel-Gesztelyi, L., Démoulin, P., Zhukov, A.N., Steed, K., Harra, L.K., et al. "The recovery of CME-related dimmings and the ICME's enduring magnetic connection to the Sun" . Solar Physics, vol. 252, no. 2, 2008, pp. 349-372.
http://dx.doi.org/10.1007/s11207-008-9255-z
---------- VANCOUVER ----------
Attrill, G.D.R., Van Driel-Gesztelyi, L., Démoulin, P., Zhukov, A.N., Steed, K., Harra, L.K., et al. The recovery of CME-related dimmings and the ICME's enduring magnetic connection to the Sun. Sol. Phys. 2008;252(2):349-372.
http://dx.doi.org/10.1007/s11207-008-9255-z