Mathematics – Logic
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35..813w&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 35, June 1987, p. 813-819.
Mathematics
Logic
20
Geomagnetism, Magnetic Field Reconnection, Magnetic Flux, Magnetopause, Daytime, Magnetohydrodynamic Waves, Twisting
Scientific paper
The detailed structure of a reconnected flux tube is examined in an effort to explain the twisted magnetic field that is commonly observed within FTEs. The definition of a twisted flux tube is first clarified. From the observed direction of the twist on both sides of the magnetopause it is argued that the twist is unlikely to be introduced after the tube formation, and so must be already present in the tube when reconnection stops. On purely topological grounds, it is evident that an FTE produced by single or multiple X-line reconnection will exhibit a twist. The evolution of such a tube is complicated, but by considering the forces inherent in such a structure, it is shown that there will be a torque acting upon the flux tubes that leave the reconnection site. The torque will propagate torsional Alfven waves along reconnected flux tubes. The sense of twist and pitch length of these torsional Alfven waves is predicted, and excellent agreement is found with observations obtained at the earth's dayside magnetopause.
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