disparation brusque

disparation brusque

(dees-pa-ra -see-awn brewsk) (French) The sudden ‘disappearance’, over a few hours, of a quiescent solar filament as it is Doppler-shifted (see Doppler shift) to a shorter wavelength in the line of sight, following disruption of the horizontal magnetic field supporting it and its subsequent rapid ascent and dissipation in the corona. The term is also sometimes used for the sudden disappearance of an active filament – although this may occur for a variety of reasons.
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