Multi-scale reconnections in a complex CME - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Advances in Space Research Année : 2008

Multi-scale reconnections in a complex CME

Résumé

A series of three flares of GOES class M, M and C, and a CME were observed on 20 January 2004 occurring in close succession in NOAA 10540. Types II, III, and N radio bursts were associated. We use the combined observations from TRACE, EIT, Halpha images from Kwasan Observatory, MDI magnetograms, GOES, and radio observations from Culgoora and Wind/ WAVES to understand the complex development of this event. We reach three main conclusions. First, we link the first two impulsive flares to tether-cutting reconnections and the launch of the CME. This complex observation shows that impulsive quadrupolar flares can be eruptive. Second, we relate the last of the flares, an LDE, to the relaxation phase following forced reconnections between the erupting flux rope and neighbouring magnetic field lines, when reconnection reverses and restores some of the pre-eruption magnetic connectivities. Finally, we show that reconnection with the magnetic structure of a previous CME launched about 8 h earlier injects electrons into open field lines having a local dip and apex (located at about six solar radii height). This is observed as an N-burst at decametre radio wavelengths. The dipped shape of these field lines is due to large-scale magnetic reconnection between expanding magnetic loops and open field lines of a neighbouring streamer. This particular situation explains why this is the first N-burst ever observed at long radio wavelengths.

Dates et versions

hal-03786284 , version 1 (23-09-2022)

Identifiants

Citer

Lidia van Driel-Gesztelyi, C. P. Goff, Pascal Démoulin, J. Leonard Culhane, Sarah A. Matthews, et al.. Multi-scale reconnections in a complex CME. Advances in Space Research, 2008, 42, pp.858-865. ⟨10.1016/j.asr.2007.04.065⟩. ⟨hal-03786284⟩
7 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More