Solar cycle and geomagnetic activity: A review for geophysicists. I - The contributions to geomagnetic activity of shock waves and of the solar wind. II - The solar sources of geomagnetic activity and their links with sunspot cycle activity

Details Solar cycle and geomagnetic activity: A review for geophysicists. I - The contributions to geomagnetic activity of shock waves and of the solar wind. II - The solar sources of geomagnetic activity and their links with sunspot cycle activity Solar cycle and geomagnetic activity: A review for geophysicists. I - The contributions to geomagnetic activity of shock waves and of the solar wind. II - The solar sources of geomagnetic activity and their links with sunspot cycle activity

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989angeo...7..565l&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 7, Dec. 1989, p. 565-593.

Physics

54

Magnetic Anomalies, Shock Waves, Solar Cycles, Solar Wind Velocity, Traveling Waves, Data Flow Analysis, Geomagnetism, Sunspot Cycle

Scientific paper

The paper reviews the Simon (1979) and Simon and Legrand (1984, 1985, 1986, 1987) classification of geomagnetic phenomena according to their interplanetary sources. Using this classification, the centennial series of geomagnetic data beginning 1986 is analyzed. Results show the respective contributions of shock waves and the solar wind to the geomagnetic activity, and identify a genuine cycle of geomagnetic activity and the relationships of its separate components to the activity of the sunspot cycle. The various mechanisms operating in the solar machinery are then examined, and the links between the spatial distribution in the interplanetary medium of the solar wind velocity and the two key parameters of the solar poloidal field, namely the intensity of the solar dipole and the 'thickness' of the slow wind sheet, are established. A model of poloidal field cycle, developed using solar data for the magnetic field on the disk and the coronal densities, is then used to investigate the relationship between the components of the geomagnetic wind activity and the sunspot maximum number.

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