Bibcode
Ferriz-Mas, A.; Moreno-Insertis, F.
Referencia bibliográfica
Astronomy and Astrophysics (ISSN 0004-6361), vol. 179, no. 1-2, June 1987, p. 268-276.
Fecha de publicación:
6
1987
Número de citas
20
Número de citas referidas
19
Descripción
The jump conditions across a shock front in a thin magnetic flux tube
are studied by purely analytical means. Some properties of
magnetohydrodynamic shock waves in extended media are shown also to hold
in the more complicated case of thin magnetic flux tubes. It is shown
that flux tube shock waves are always compressive, thus being
accompanied by a weakening of the magnetic field strength and increase
of the tube radius. Some consequences of this are examined, such as the
sub- or supercritical character of the flow velocity with respect to the
Alfvén, sound and "tube" speeds. The range of variation of the
ratios of the different variables across the shock front is determined
along with the equivalent of the Hugoniot curve and further properties
of the shocks in magnetic flux tubes. The analogies and differences with
HD and MHD shocks in extended media are pointed out. Finally, some
implications of the shock wave structure for the solar atmosphere are
briefly discussed.