Longitudinal Structure of Solar cycle 23

The non-axisymmetrical pattern of solar activity during the 1996-2004 years has been studied using the SOHO/MDI, SOHO/EIT and WSO data. These data reveal close correlation between the non-axisymmetrical magnetic field and coronal structures. The long-lived complexees of solar activity have clusterred in preferred (active) longitudes and have shown an impulsive nature of the solar cycle. The nature of active longitudes or active longotudinal zones is discussed.