Simulations of argon beam experiments flown in two sounding rocket flights (ARC 1,2) reveal two bands of electrostatic wave emissions, one at high frequencies around the upper hybrid mode, the other at low frquencies around the lower hybrid mode. The latter is significantly enhanced by the argon beam in the simulations, and the enhancement was clearly observed on ARCS 2. This enhancement at phase velocities greater than the beam velocity is suggested to be due to an increase in the thermal fluctuation level of the plasma when the argon beam is present. Inclusion of electron dynamics and oblique angles of wave propagation with respect to B allows investigation of electron heating. Electron tail heating is observed parallel to B for k∥/k⊥~√me/m0, while background ions are heated perpendicular to B.