Impulsive Nature of Solar Cycle

Mathematics – Logic

Scientific paper

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Scientific paper

Extreme-Ultraviolet data from EIT/SOHO (1996-2002 years), soft X-ray data from YOHKOH (1991-2001), and magnetic field data from MDI/SOHO (1996-2002 years) and Kitt Peak Observatory (1991-2002) are analyzed together in the form of synoptic maps for the investigation of solar cycle variations of the corona and magnetic field. These results show new interesting relations between the evolution of topological structure of the corona, coronal heating and the large-scale magnetic field. The long-living coronal structures are related to complexes of solar activity and display the quasiperiodic behavior (impulses of coronal activity) with periods of 1.0-1.5 year in the axisymmetrical distribution of EUV and X-ray fluxes during the current solar cycle 23. In particular, during the second maximum of the cycle 23 corona became somewhat hotter than in the period of the first maximum.

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