Coronal Mass Ejections and the Index of Effective Solar Multipole

Obridko V. N., Ivanov E. V., Ozguc A., KILÇIK A., Yurchyshyn V. B.

SOLAR PHYSICS, vol.281, no.2, pp.779-792, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 281 Issue: 2
  • Publication Date: 2012
  • Doi Number: 10.1007/s11207-012-0096-4
  • Journal Name: SOLAR PHYSICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.779-792
  • Akdeniz University Affiliated: No

Abstract

The paper considers the relationship between the cyclic variations in the velocity of coronal mass ejections (CME) and the large-scale magnetic field structure (LSMF) in cycles 21-23. To characterize a typical size of the LSMF structure, we have used the index of the effective solar multipole (ESMI). The cyclic behavior of the CME occurrence rate and velocity proved to be similar to that of ESMI. The hysteresis observed in variations of the CME maximum velocity is interpreted as a manifestation of different contributions from the two field structures (local and global magnetic fields) in different phases of the 11-year activity cycle. It is suggested that cyclic variations in the maximum velocity of coronal mass ejections are due to different conditions for the formation of the complexes of active regions connected by coronal arch systems, which are the main source of high-velocity CMEs.