The linear spectrum of twisted magnetic flux tubes in viscous MHD B. Pint'er, R. Erd'elyi and M. Goossesns Centre for Plasma Astrophysics, K.U.Leuven, Celestijnenlaan 200B, B­3001 Heverlee, Belgium (Received ) In the present paper we investigate the influence of tensorial viscosity on the linear MHD spectrum for isolated twisted magnetic flux tubes surrounded by vacuum. ... Numerical simulations show that in ideal MHD a poloidal magnetic field can destabilize the mag­ netic structure. ... Fig. ...

A problem, that can arise when moving from Fortran 77 to Fortran 90, is dependent on a usual deviation from the standard, and has to do especially with user programs. ... With many Fortran 77 implementations we wrote PROGRAM TEST REAL X WRITE(*,10) 10 FORMAT('Give X = ',$) READ(*,*) X WRITE(*,*) X END In Fortran 90 we use "non-advancing I/O" instead. ... In some old Fortran dialects the statement TYPE was used to write on a typewriter terminal and PRINT was used to write on the line printer. ...