Simulation of Lower-Hybrid Wave Enhancement by Chemical Substance Release

A physical model for enhancing lower-hybrid (LH) waves by releasing chemicals within the ionosphere is established. The model can calculate the spatiotemporal evolution of LH wave field intensities at various frequencies following the injection of neutral particles. We compare the effects of ion-ring beam density and background electron density on the growth rate of LH waves. It is confirmed that, under the same conditions, the higher the frequency of the LH wave, the smaller its growth rate. We also calculate and analyze the differences in the enhanced state of LH waves at frequencies of 30 and 40 kHz, as well as the impact of varying release altitude on the amplification effect of LH waves. The results show that the higher the frequency of the LH wave, the weaker the amplification effect, as evidenced by a smaller amplification region and a shorter duration of the amplified state. Moreover, increasing the release altitude of the chemical substance can optimize the enhancement effect of the LH waves. However, the upper limit to which the LH wave electric field can grow remains relatively fixed. Due to energy conservation, the ion-ring beam can no longer amplify the LH waves after its energy is depleted. Therefore, not all regions of the LH wave are enhanced or exhibit significant amplification within the range covered by the ion-ring beam, and “voids” exist in the amplification area of the LH waves. Nevertheless, increasing the altitude of chemical substance release can reduce the proportion of “void” areas.