Influence of the Solar Global Magnetic Field Structure Evolution on CMEs

TL;DR

This study explores how the evolution of the solar global magnetic field structure influences the occurrence, location, and parameters of coronal mass ejections across solar cycles 23 and 24, highlighting the role of magnetic Rossby waves.

Contribution

It proposes a new model linking Rossby wave-induced GMFS changes to CME behavior, advancing understanding of solar magnetic dynamics and CME regulation.

Findings

CME distribution is regulated by GMFS evolution, not random.

Rossby waves in the tachocline influence GMFS cycle changes.

CME parameters depend on GMFS change sharpness and magnetic field strength.

Abstract

The paper considers the influence of the solar global magnetic field structure (GMFS) cycle evolution on the occurrence rate and parameters of coronal mass ejections (CMEs) in cycles 23-24. It has been shown that over solar cycles, CMEs are not distributed randomly, but they are regulated by evolutionary changes in the GMFS. It is proposed, that the generation of magnetic Rossby waves in the solar tachocline results in the GMFS cycle changes. Each Rossby wave period favors a particular GMFS. It is proposed that the changes in wave periods result in the GMFS reorganization and consequently in CME location, occurrence rate, and parameter changes. The CME rate and parameters depend on the sharpness of the GMFS changes, the strength of the global magnetic field and the phase of a cycle.