Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phdt.........5h&link_type=abstract
Ph.D. Thesis Stanford Univ., CA.
Astronomy and Astrophysics
Astronomy
70
Astronomical Models, Current Sheets, Evolution (Development), Heliosphere, Solar Corona, Solar Magnetic Field, Sun, Cosmic Rays, Magnetic Field Configurations, Photosphere, Quadrupoles, Solar Cycles, Solar Wind
Scientific paper
The structure and evolution of the large scale photospheric and coronal magnetic fields in the interval 1976 to 1983 were studied using observations from the Stanford Solar Observatory and a potential field model. The model predicts the location of the current sheet. Near solar equator having two extension north and south of the equator. Soon after minimum the latitudinal extent began to increase. The sheet reached to at least 50 degrees from 1978 through 1983. During most of the solar cycle the quadrupole and occasionally octupole moments of the field are important, especially for the structure in the ecliptic. The complex field configuration near maximum does not correspond to a dipole rotating from north to south as the polar fields change as has been previously suggested. The large latitudinal extent of the current sheet over much of the cycle affects the propagation of cosmic rays.
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