Physics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..679..612m&link_type=abstract
SOLAR WIND TEN: Proceedings of the Tenth International Solar Wind Conference. AIP Conference Proceedings, Volume 679, pp. 612-6
Physics
1
Particle Emission, Solar Wind, Planetary Bow Shocks, Interplanetary Shocks, Solar Wind Plasma, Sources Of Solar Wind
Scientific paper
At the Sun shock waves are produced either by flares or by coronal mass ejections and are regarded to be the source of solar energetic particle events. The propagation of a disturbance away from an active region through the corona into the interplanetary space is considered by evaluating the radial behaviour of the Alfvén speed. The magnetic field of an active region is modelled by a magnetic dipole superimposed on that of the quiet Sun. Such a magnetic field structure leads to a local mimimum of the Alfvén speed in the middle of the corona and a maximum of 740 km/s at a radial distance of 6 solar radii from the center of the Sun. The occurrence of these extrema of the Alfvén speed has consequences for the formation and development of shock waves in the corona and interplanetary space.
Aurass Henry
Classen H.-T.
Klassen Andreas
Mann Gottfried
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