Study of ULF-VLF wave propagation in the near-Earth environment for earthquake prediction, Advances in Space Research, Volume 63, Issue 12, 2019, I suggest that authors provide the explanation on ELF or VLF excitation during HF modulation (Beat wave) and try to provide a more general conclusion rather than just studying the excited diamagnetic current and its aspect angle dependency. This new study which is a continuation of previous work by Eliasson and Papadapoulos 2012, has shown that the VLF signal may not penetrate to the D-region as efficient as the ELF signal. Another issue that is not discussed or addressed properly here is the work done by Mahmoudian and Kalaee, 2019.You may mention that your work is including more physics that was neglected in the previous studies. This is not an appropriate way to promote your work. As an example please lines 30-34 and many more examples to be find. There are many grammatical mistakes and very long sentences that make it difficult for the reader to follow.The model explains why the radiation efficiency was strongest when the X wave is heating along the magnetic dip angle as reported in recent observations by Kotik et al…. The model explains why the radiation efficiency in Kotik's experiment was strongest 15 when the X wave is heating along the magnetic dip angle. In the abstract, the authors mentioned the following statement which is not appropriate. We present the effective conductivity as a function of the angle between the geomagnetic field and the radio wave the model explains why the radiation efficiency in Kotik's experiment was strongest when the X wave is heating along the magnetic dip angle. The current density profile is a flow ring. The low collision frequency between charged particles and neutral particles has little effect on the current, and the collision frequency of electrons and ions is independent of the drift current. Diamagnetic drift current is the main form of current. The maximum drift current density is 8 × 10 −10 A ⋅ m −2, and its surface integral is 5.76 A. The results indicate that the maximum change of electron temperature Δ T e is about 570 K, and the ratio is Δ T e / T e ~48 %. Based on these equations, the ionospheric electron temperature and drift current are investigated. We present a theoretical and numerical study of drift current model in the ionosphere by incorporating the ohmic heating model and the magnetohydrodynamic (MHD) momentum equation.
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