Distinction in the Interplanetary Characteristics of Accelerated and Decelerated CMEs/Shocks

  • K. SureshEmail author
  • A. Shanmugaraju
  • Y.-J. Moon


A set of 58 Coronal Mass Ejections (CMEs) with different kinematics near the sun in LASCO Field of view (FOV) is classified into two groups (i) CMEs which are accelerating (group-I) and (ii) CMEs which are decelerating (group-II). We analyze their interplanetary propagation characteristics to study the distinction between these two groups of events. Some of the following deviations are noted between the two groups as: (i) While group-II events have greater mean values of Standoff distance, Standoff time than the group-I events, the mean transit times of ICMEs and IP shocks are relatively lower for them. (ii) Group-II events are more (30%) radio-rich than the group-I (10%) and they are associated with type II solar radio burst in lower corona, (iii) The possibility of having excess magnetic energy that supports the propagation of CMEs to some extent is studied using estimated speed (VEST) and it is found that a slightly more number of events in group-I (48%) has VEST > VLASCO than group-II (33%). (iv) Net interplanetary acceleration is positive for 35% and 19% in group-I and group-II events respectively. (v) It is also found that ICME/IP shock characteristics of the two groups depend strongly on the CME acceleration.


CME ICME IP shock 


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© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Department of PhysicsRathinam Technical CampusCoimbatoreIndia
  2. 2.Department of PhysicsArul Anandar CollegeMaduraiIndia
  3. 3.School of Space ResearchKyung Hee UniversityYonginRepublic of Korea

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