PlasmaCalcs.addons.instability_tools.instability_theory_tools.xarray_smod_vphase

PlasmaCalcs.addons.instability_tools.instability_theory_tools.xarray_smod_vphase(array)

returns signed magnitude of phase velocity: smod_vphase = real(omega) / |k|.

(result’s sign is same sign as real(omega).)

Phase velocity tells wave propagation speed. Group velocity tells wave envelope speed.

For DataArrays, assumes array is an array of real(omega) if real, or omega (if complex).

For Datasets, gets omega from ds[‘omega’].

See also: mod_vphase, vphase.