Data from multiwave observations of the Sun and images obtained in chromospheric lines enable us to diagnose the dynamic pattern at the initial phase of a coronal mass ejection (CME) development in a strong flare events. Such events usually have high geoefficiency. Using nine events as an example, we have demonstrated that CME topology is characterized by considerable asymmetry of chromospheric bases and different manifestations before and after the impulsive acceleration phase. Typical differences between the emission in chromospheric bases of CME and that in flare ribbons have been shown. With the 2002 July 23 event as an example, we have proposed a mechanism of generation of energetic ions in CME magnetic arcs that can explain the initiation of gamma source and chromospheric emission in distant CME bases.