On the enhanced coronal mass ejection detection rate since the solar cycle 23 polar field reversal

Abstract

Coronal mass ejections (CMEs) with angular width $>30^{\circ }$ have been observed to occur at a higher rate during solar cycle 24 compared to cycle 23, per sunspot number. This result is supported by data from three independent databases constructed using Large Angle and Spectrometric Coronagraph Experiment (LASCO) coronagraph images, two employing automated detection techniques and one compiled manually by human observers. According to the two databases that cover a larger field of view, the enhanced CME rate actually began shortly after the cycle 23 polar field reversal, in 2004, when the polar fields returned with a 40\% reduction in strength and interplanetary radial magnetic field became $\approx 30\%$ weaker. This result is consistent with the link between anomalous CME expansion and heliospheric total pressure decrease recently reported by Gopalswamy et al.

ApJ accepted August 31

References in corpus (5)

• Anomalous Expansion of Coronal Mass Ejections during Solar Cycle 24 and its Space Weather Implications
• The Peculiar Behavior of Halo Coronal Mass Ejections in Solar Cycle 24
• Solar magnetic activity cycles, coronal potential field models and eruption rates
• The kinematics of coronal mass ejections using multiscale methods
• Evolution of active and polar photospheric magnetic fields during the rise of Cycle 24 compared to previous cycles

Cited by in corpus (7)

• History and Development of Coronal Mass Ejections as a Key Player in Solar Terrestrial Relationship
• Stellar Coronal Mass Ejections I. Estimating occurrence frequencies and mass-loss rates
• Mass Loss via Solar Wind and Coronal Mass Ejections During Solar Cycle 23 and 24
• What do halo CMEs tell us about solar cycle 25?
• Effect of the Weakened Heliosphere in Solar Cycle 24 on the Properties of Coronal Mass Ejections
• Solar Activity and Space Weather
• Space, time and velocity association of successive coronal mass ejections