Determining the Chirality Of Filaments Associated with CMEs

Astronomy and Astrophysics – Astronomy

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There is currently much debate over the initiation mechanism of coronal mass ejections. One distinction in the various models is the degree of magnetic complexity in the pre-CME active region. For instance, the magnetic breakout model requires a null point in the coronal field and for reconnection to occur at that null point. Recently, Ugarta-Urra et al. (2007) investigated the magnetic topology of the sources of 26 CME events using extrapolations of photospheric fields to find the location of coronal magnetic null points, if any, and hence test the validity of the breakout model. Seven of the 26 CMEs studied supported the breakout model, 12 did not support the model, and 7 were difficult to interpret. In this poster, we present preliminary results from a continuing investigation these 26 events. First we determine if an Halpha filament was associated with the eruption. If a filament was present, we find the chirality (handedness) of the filaments using the method described by Martin (1998). We will categorize the filament properties in terms of Ugarte-Urra's findings to determine if certain filament properties are associated with a breakout or non-breakout CMEs.

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