Impulses of activity and the Solar cycle

Details Impulses of activity and the Solar cycle Impulses of activity and the Solar cycle

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003soph..216..325b&link_type=abstract

Solar Physics, v. 216, Issue 1, p. 325-341 (2003).

Physics

10

Scientific paper

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

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