In this paper, propagation characteristics of electromagnetic electron cyclotron (EMEC) waves based on kappa-Maxwellian distribution have been investigated to invoke the interplay of the electric field parallel to the Earth’s magnetic field and auroral trapped electrons. The dispersion relation for EMEC waves in kappa-Maxwellian distributed plasma has been derived using the contribution of the parallel electric field and trapped electron speed. Numerical results show that the presence of the electric field has a stimulating effect on growth rate, which is more pronounced at low values of wave number. It is also observed that as the threshold value of trapped electron speed is surpassed, it dominates the effect of the parallel electric field and EMEC instability is enhanced significantly. The electric field acts as another source of free energy, and growth can be obtained even in the absence of trapped electron drift speed and for very small values of temperature anisotropy. Thus the present study reveals the interplay of the parallel electric field and trapped electron speed on the excitation of EMEC waves in the auroral region.

本文研究了基于κ-麦克斯韦分布的电磁回旋加速器（EMEC）波的传播特性，以调用平行于地球磁场的电场与极光捕获电子的相互作用。利用平行电场和俘获电子速度的作用，推导了EMEC波在κ-麦克斯韦分布等离子体中的色散关系。数值结果表明，电场的存在对生长速率具有刺激作用，在低波数下更明显。还观察到，当超过捕获的电子速度的阈值时，它支配了平行电场的作用，并且EMEC的不稳定性大大增强。电场是自由能的另一种来源，即使在没有捕获的电子漂移速度且温度各向异性值很小的情况下，也可以获得生长。因此，本研究揭示了极光区域中EMEC波激发时平行电场和捕获电子速度的相互作用。