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Recently, two strong homologous white-light flares of GOES X-class occurred on the Sun on September 06, 2017, providing a rare exceptional opportunity to study the mechanisms responsible for the formation of the magnetic field configurations suitable for the manifestation of such yet enigmatic eruptive events and their effects in the lower layers of the solar atmosphere.Using photospheric vector magnetograms,...
Based on the Kuperus–Raadu filament model, we analyze the vertical stability of a magnetic-flux rope as a whole, taking into account the gravitational force and mass-unloading. We use the small-perturbation method to determine conditions of the eruptive instability caused by vertical displacements. It has been shown that the upper limit of the magnetic-field decay index describing the flux-rope stability...
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