H-alpha; Moreton waves observed on December 06, 2006 A 3D case study

FRANCILE, CARLOS; COSTA, ANDREA; LUONI, M. L.; ELASKAR, SERGIO

ASTRONOMY AND ASTROPHYSICS

EDP SCIENCES S A

Lugar: Paris; Año: 2013 vol. 552 p. 1 - 10

0004-6361

Context. We present high temporal resolution observations of a Moreton wave event detected with the Hα Solar Telescope from Argentina (HASTA) in the Hα line 656.3nm, on December 6th, 2006.Aims. The aim is to contribute to the discussion about the nature and triggering mechanisms of Moreton wave events, their relation with CME?s and the slower EIT waves.Methods. We describe the HASTA telescope capabilities and the observational techniques developed. We carry out a detailed analysis of the radiant point as probable origin of the event. We use a 3D reconstruction of the HASTA and the corresponding TRACEobservations, together with conventional techniques, to analyse the coronal nature of the phenomenon.Results. Chromosphere: The kinematic parameters of the Moreton wave event, associated with a X6.5 flare, are determined. Corona: Small-scale ejecta and the winking of remote filaments are analysed to discuss the type of coronal MHD wave that could originate theobserved patterns in Hα images and its probable origin.Conclusions. The detailed analysis of the Moreton wave event favors the hypothesis that the phenomenon can be described as the chromospheric imprint of a single fast coronal shock originated in a flare pressure pulse, although a CME origin could not be discarded.