A concept of actively stimulating the auroral plasma using a high-power pulsed HF radio wave transmitting system is described. A unique feature of a pulsed modular system is the unprecedentedly high power (e.g., 10--100 MW) that can be achieved. This pulsed HF system would be used in the excitation of short-term nonlinear plasma phenomena, such as resonant enhancement, particle energization, electron density profile modification, excitation of VLF plasma waves, and the modification of auroral optical emission. This excitation is predicted on the basis of previous experience, which includes laboratory simulation experiments at high-pulsed power, excitation of the ionospheric plasma at low latitudes, and theoretical calculations.