An Over-and-out Halo Coronal Mass Ejection Driven by the Full Eruption of a Kinked Filament

Details An Over-and-out Halo Coronal Mass Ejection Driven by the Full Eruption of a Kinked Filament An Over-and-out Halo Coronal Mass Ejection Driven by the Full Eruption of a Kinked Filament

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...749...12y&link_type=abstract

The Astrophysical Journal, Volume 749, Issue 1, article id. 12 (2012).

Astronomy and Astrophysics

Astronomy

Sun: Activity, Sun: Coronal Mass Ejections: Cmes, Sun: Filaments, Prominences, Sun: Flares, Sun: Magnetic Topology

Scientific paper

Over-and-out coronal mass ejections (CMEs) represent a broad class of CMEs that come from flare-producing magnetic explosions of various sizes but are laterally far offset from the flare, and their productions can be depicted by the magnetic-arch-blowout scenario. In this paper, we present observations of an over-and-out halo CME from the full eruption of a small kinking filament in an emerging active region (AR). In combination with the results of a derived coronal magnetic configuration, our observations showed that the CME was associated with a coronal helmet streamer, and the filament was located in the northern outskirts of the streamer base. Formed along a neutral line where flux cancellation was forced by the emerging AR with the surrounding opposite-polarity magnetic field, the filament underwent a full, non-radial eruption along the northern leg of the streamer arcade, accompanied by a clockwise deflection of the eruption direction. As a characteristic property of kink instability, the eruption displayed a clear inverse γ shape, indicative of a writhing motion of the filament apex. Coronal dimmings, including a remote one, formed in opposite-polarity footprint regions of the streamer arcade during the eruption, and the consequent CME was laterally offset from the AR. These observations suggest that the kink instability is likely to be the driver in the eruption. The event can be well explained by putting this driver into the magnetic-arch-blowout model, in which the eruption-direction deflection and the full-eruption nature of the kinking filament are caused by the guiding action of the streamer arcade and the external reconnection between them.

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