Some solar cycle phenomena related to the geomagnetic activity from 1868 to 1980. II - High velocity wind streams and cyclical behavior of poloidal field

Details Some solar cycle phenomena related to the geomagnetic activity from 1868 to 1980. II - High velocity wind streams and cyclical behavior of poloidal field Some solar cycle phenomena related to the geomagnetic activity from 1868 to 1980. II - High velocity wind streams and cyclical behavior of poloidal field

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...155..227s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 155, no. 2, Feb. 1986, p. 227-236.

Astronomy and Astrophysics

Astrophysics

26

Geomagnetism, Long Term Effects, Solar Cycles, Solar Terrestrial Interactions, Cosmic Rays, Interplanetary Medium, Magnetic Variations, Solar Wind Velocity, Sunspots

Scientific paper

Geomagnetic activity related to the distribution around the sun of the corotating sources of solar wind is discussed. The physical conditions at the solar wind sources, the cyclical behavior of the poloidal field, and the relationships between the indices aa of geomagnetic activity and the solar wind parameters are reviewed. It is shown that, at the peak of its expansion, the solar wind is actually driven from some midlatitude source to the ecliptic plane. The contribution to the recurrent pattern of the tilt of the solar dipole, the annual oscillation of the solar axis, and the stream expansion is discussed. It is concluded that the time behavior of the polar stream velocity is closely related to the topology of the poloidal field, specifically to the gradient of the field distribution inside the polar holes. The phase/intensity relationship between the polar stream activity and the following sunspot cycle is explained as a relationship between the poloidal and the toroidal field of the sun.

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