Relationship among EIT Waves, Coronal Mass Ejections, Solar Flare, Coronal Holes, and Solar Wind Phenomena

In the present paper, to understand the role of solar winds in the origin of the coronal mass ejections (CMEs)  Phenomena we have studied the relationship between the Extreme Ultraviolet Imaging Telescope (EIT) waves phenomena with solar flares, coronal holes, solar winds, and CMEs events. The EIT/ SOHO instrument recorded 176 EIT events during the above period (March 25, 1997-June 17, 1998) and the EIT waves list was published by Thompson & Myers (2009). After temporal matching of EIT wave events with CME phenomena, we find that corresponding to 58 EIT wave events, no CME events were recorded and thus we excluded 58 EIT wave events from the present study. Out of 176 EIT wave events, only 106 are accompanied by CME phenomena. The correlation study of the speed of EIT wave events and CMEs events of 106  events shows poor correlation r= 0.32, indicating that the EIT waves and CMEs events do not have a common mechanism of origin and also indicate that some other factor is working in the formation of  CMEs from EIT waves. Further, we have also matched the spatial matching EIT wave sources as indicated by Thomson & Myers (2009) with CHs and flares and found that CMEs appear to be associated with EIT wave phenomena and CHs.  Earlier  Verma & Pande (1989) and  [3] Verma (1998) indicated 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. Most recently Verma & Mittal (2019) proposed a methodology to understand the origin of CMEs through magnetic reconnection of   CHs open magnetic field and solar flares.  In the present paper, we proposed a scenario/ 2-dimensional model in which the origin of CMEs through reconnection of EIT waves and solar winds coming from the CHs and also found that the calculated CMEs velocity after reconnection of EIT waves and solar winds coming from the CHs are in very close to the observed CMEs linear velocity. We also calculated the value of the correlation coefficient between the observed linear velocity of CME events and the calculated value of CME velocity after reconnection and found the value as r=0.884. The value of correlation as r=0.884 is excellent and supports the proposed methodology.  Finally, we have also discussed the role of solar wind phenomena in the formation of CMEs phenomena with other solar phenomena, in the latest scenario of solar heliophysics phenomena.

 

REFERENCES

Thompson, B. J.  &  D. C.  Myers, D. C. (2009) Astrophys. J. Suppl. 183, 225.

 Verma, V. K.  &  Pande, M. C. (1989)  Proc. IAU Colloq. 104  (Poster Papers) , p.239.

 Verma, V. K. (1989)  J.  Geophys Indian Union, 2, 65

Verma, Virendra & Mittal, N.  (2019) Astronomy Letters, 45, 164-176.