Synthesis of CME-associated Moreton and EIT wave features from MHD simulations

摘要

Soft X-ray (SXR) waves, EIT waves, and H alpha Moreton waves are all associated with coronal mass ejections (CMEs). The knowledge of the characteristics about these waves is crucial for the understanding of CMEs, and hence for the space weather researches. MHD numerical simulation is performed, with the consideration of the quiet Sun atmosphere, to investigate the CME/flare processes. On the basis of the numerical results, SXR, EUV, and H alpha images of the eruption are synthesized, where SXR waves, EIT waves, and H alpha Moreton waves are identified. It confirms that the EIT waves, which border the expanding dimmming region, are produced by the successive opening (or stretching) of the closed magnetic field lines. H alpha Moreton waves are found to propagate outward synchronously with the SXR waves, lagging behind the latter spatially by similar to 27 Mm in the simulated scenario. However, the EIT wave velocity is only a third of the Moreton wave velocity. The synthesized results also suggest that H alpha +/- 0.45 angstrom would be the best off-band for the detection of H alpha Moreton waves.