Relationship of EIT Waves Phenomena with Coronal Mass Ejections

VIRENDRA VERMA, Uttarakhand Space Application Center, Dehradun

In the present paper, we have studied the relationship of Extreme Ultraviolet Imaging Telescope (EIT)  waves phenomena with coronal mass ejections (CME) events.  This study is a part of our research work to understand the origin of CMEs and its relationship with EIT waves phenomena. To carry out this study we have used EIT waves list (March 25, 1997-June 17, 1998) published by Thompson & Myers (2009) and CMEs data for the same period observed by LASCO/ SOHO. The EIT/ SOHO instrument recorded 176 EIT events during above period and after matching with CMEs phenomena we find that corresponding to 84 EIT wave events,  no CMEs events were recorded and thus we excluded 84 EIT wave events from the present study. Out of 176 EIT wave events, only 92 are accompanied by CMEs phenomena. The correlation study of the speed of EIT wave events and CMEs events of 92 events shows poor correlation r=0.21 indicate that the EIT wave and CMEs events do not have a common mechanism of origin. Earlier Verma & Pande (1989), Verma (1998) and recently Verma & Mittal (2019)  reported that the CMEs may have been produced by some mechanism, in which the mass ejected by solar flares or active prominences, gets connected with the open magnetic lines of CHs (source of high-speed solar wind streams) and moves along them to appear as CMEs. The results obtained in the present are also discussed in the view of the recent scenario of heliophysics.   References: Thompson, B. J. & Myers, D. C. (2009) APJS, 183, 225. Verma, V. K. & Pande, M. C. (1989) Proc. IAU Colloq. 104 Solar and Stellar Flares (Poster Papers), Stanford University, Stanford, USA, p.239. Verma, V. K.(1998) Journal of Geophysical Indian Union, 2, 65. Verma, V. K. & Mittal, N.(2019) Astronomy Letters, 45, 164-176.