Interplay of parallel electric field and trapped electrons in kappa-Maxwellian auroral plasma for EMEC instability

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.

国际海洋能技术进展综述

在过去两年中,国际海洋能技术取得了重要进展。英国MeyGen潮流能发电场一期工程竣工,6 MW潮流能发电阵列并网发电,荷兰Torcado公司1.2 MW潮流能发电阵列并网发电,标志着国际潮流能技术开始迈向商业化应用。芬兰"企鹅"号1 MW波浪能发电装置在英国EMEC进行了3年多示范运行,澳大利亚Carnegie公司在英国康沃尔布放1 MW波浪能发电装置测试运行,以西班牙Mutriku、以色列Eco等为代表的小功率波浪能发电技术已实现并网运行。百千瓦级温差能示范电站运行良好,为兆瓦级电站建造积累了重要经验。分析国际海洋能技术现状及发展趋势,可为我国海洋能技术发展提供有益借鉴,有助于我国海洋能技术尽早实现产业化发展。