The use of linearized Euler equations for direct prediction of superso
nic jet noise is explored. It is shown that a high-order numerical sch
eme coupled with proper boundary treatment can produce a stable soluti
on nearly free from reflections. Results are verified against analytic
al results for sound radiated by instability waves. Applicability of t
his approach to real jets is explored by taking the inflow disturbance
s to be random in time and comparing the computed sound field to the e
xperimentally measured one.