Induced electron‐cyclotron emission from inhomogeneous, anisotropic plasmas with electron population inversion

The amplified emission of electron cyclotron radiation near the fundamental frequency from an inhomogeneous, anisotropic plasma slab with a loss‐cone‐type electron velocity distribution, is investigated in a linear theory. Plasma polarization effects are consistently included. Expressions are developed in the WKB approximation for emission in the ordinary and the extraordinary modes, for propagation perpendicular to the magnetic field. Numerical results are given for the extraordinary mode, for which effects are strongest. It is shown that the amplification is sensitively dependent on the ratio of parallel‐to‐perpendicular temperature and on inhomogeneities in the magnetic field.