  We study wave instability in an collisionless, rarefied hot plasma (e.g.
solar wind or corona). We consider the anisotropy produced by the magnetic
field, when the thermal gas pressures across and along the field become
unequal. We apply the 16-moment transport equations (obtained from the
Boltzmann-Vlasov kinetic equation) including the anisotropic thermal fluxes.
The general dispersion relation for the incompressible wave modes is derived.
It is shown that a new, more complex wave spectrum with stable and unstable
behavior is possible, in contrast to the classic fire-hose modes obtained in
terms of the 13-moment integrated equations.
