We present a statistical analysis of solar coronal mass ejections (CMEs) based on 23 years
of quasi-continuous observations with the LASCO coronagraph, thus covering two complete …

The Sun is nowadays observed using di? erent techniques that provide an almost
instantaneous 3-D map of its structure. Of particular interest is the studyofthevariabilityinthesolaroutputproduc …

From sunspot drawings provided by the Kanzelhöhe Solar Observatory, Austria, and the
Skalnaté Pleso Observatory, Slovak Republic, we extracted a data catalogue of hemispheric …

Traditionally, the solar activity cycle is thought as an interplay of the main dipole component
of the solar poloidal magnetic field and the toroidal magnetic field. However, the real picture …

Abstract The Kodaikanal Observatory has provided long-term synoptic observations of
chromospheric activities in the Ca ii K line (393.34 nm) since 1907. This article investigates …

Numerical simulations that reproduce solar-like magnetic cycles can be used to generate
long-term statistics. The variations in north-south hemispheric solar cycle synchronicity and …

Solar activity indices vary over the Sun's disk, and various activity parameters are not
considered to be symmetric between the northern and southern hemispheres of the Sun …

Rieger-type periodicity has been detected in different activity indices over many solar cycles.
It was recently shown that the periodicity correlates with solar activity having a shorter period …

The frequency spectrum of the hemispheric asymmetry of solar activity shows enhanced
power for the period ranges around 8.5 years and between 30 and 50 years. This can be …

Solar activity is asymmetric in the two hemispheres in almost all cycles. This asymmetry is
observed both in cycle amplitude and period. We have used about 90 years of sunspot-area …