PREDNASAJUCI / LECTURER :

A.M. Veronig, K. Vaninnathan, K. Dissauer, M. Temmer,
N. Nitta, B. Vrsnak, P. Mesa Ortega

NAZOV / TITLE :

Kinematics and Differential Emission Measure Analysis of
a Moreton/EUV wave

ABSTRAKT / ABSTRACT :

Moreton waves are the chromospheric signature of large-scale MHD shock
waves propagating in the solar corona that occur in association with
coronal mass ejections. Whereas large-amplitude coronal EUV waves are
frequently observed in association with CMEs, Moreton waves are very rare
phenomena. In the present solar cycle no. 24, no more than about five
events have been reported so far. We present a detailed case study of a
Moreton wave observed by the GONG Halpha network that occurred in
association with the X1 flare/CME on 29th March 2014. We perform a
kinematical analysis of the wave and the associated CME, as well as
Differential Emission Measure analysis based on the six AIA/SDO EUV
filters, in order to study the plasma changes associated with the passing
Moreton wave front. We find that the Moreton wave front is co-spatial with
a propagating pulse of enhanced density, up to about 15% compared to the
pre-event state, and also associated with an increase in temperature. These
changes are significantly higher than the increase observed for EIT waves
that were not associated with a Moreton wave, providing further evidence
for the shock nature of the phenomenon.