Moreton Waves Related to the Flare Event in 3 June 2012 and 6 July 2012

TL;DR

This study analyzes and compares two Moreton waves observed in 2012, revealing their distinct features and velocities, and linking them to associated solar flare events, thus enriching the understanding of large-scale solar wave phenomena.

Contribution

The paper provides detailed geometrical and kinematical analysis of two Moreton waves from 2012, highlighting their differences and association with specific solar flares, which is a novel contribution to solar wave studies.

Findings

The June 3rd wave had a speed of about 931 km/s and a 70° angular span.

The July 6th wave propagated at approximately 994 km/s, matching coronal shock velocities.

Both waves are linked to specific solar flare events, expanding the inventory of large-scale solar waves.

Abstract

In this study, we present geometrical and kinematical analysis of Moreton wave observed in 2012 June 3rd and July 6th, recorded in H-$\alpha$ images of Global Oscillation Network Group (GONG) archive. These large-scale waves exhibit different features compared to each other. The observed wave of June 3rd has angular span of about $70^{\circ}$ with a diffuse wave front associated to NOAA active region 11496. It was found that the speed of the wave that started propagating at 17.53 UT is about $931\pm80$ km/s. The broadness nature of this Moreton wave can be interpreted as the vertical extension of the wave over the chromosphere. On the other hand, the wave of July 6th may be associated to X1.1 class flare that occurred at 23.01 UT around the 11515 active region. From the kinematical analysis, the wave propagated with the initial velocity of about $994\pm70$ km/s which is in agreement with coronal shock velocity derived from type II radio burst observation, $v\sim1100$ km/s. These two identified waves add the inventory of the large-scale waves observed in 24th Solar Cycle.