COMPARISON OF CONDITIONS OF DEVELOPMENT AND PROPAGATION OF INERTIA-GRAVITY WAVE IN THE NONHOMOGE-NEQUS FIELDS IN LOWER-LATITUDE REGION WITH THOSE IN MIDDLE-LATITUDE REGION

Using WKBJ method,the equations of inertia-gravity wave (IGW)in the nonhomogeneous fields in lower latitude region are derived,the conditions of development and Propagation of IGW are discussed.Comparing these conditions in lower-latitule region with those in middlel-latitude region,the differences between them are indicated.