engleski

Study of the kinematics and driver of the global Moreton wave observed on 2003 October 28

We analyze the evolution and kinematics of the fast, globally propagating Moreton wave of 2003 October 28 associated with the extreme X17.2 solar flare/CME event. This Moreton wave is distinct due to its strengths and azimuthal span of span 360. We study the wave kinematics in different propagation directions, and compare it with the following associated phenomena: EIT wave, coronal dimmings, fast halo CME, flare, and type II burst. The sectoral analysis yield mean velocity values in the range 900-1000 km/s ; two sectors show wave deceleration. The perturbation profile evolution indicates an amplitude growth followed by amplitude weakening and broadening, which is consistent with a disturbance first driven and then evolving into a freely propagating wave. We find two `'radiant points" for the Moreton wave fronts on opposite east-west edges of the source region, roughly co-spatial with the bipolar coronal dimming. The co-spatiality of the associated radio type II burst source and the first Moreton wave fronts indicate that the wave was launched from an extended region. These findings indicate that the wave is initiated by the CME expanding flanks.

Moreton waves; CMEs; Flares

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