Strong DC electric field formation in the low latitude ionosphere over typhoons
Strong DC electric field formation in the low latitude ionosphere over typhoons
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DOI：
10.1016/j.jastp.2005.06.014
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发表时间：
2005-09
影响因子：
1.9
通讯作者：
V. Sorokin;N. Isaev;A. Yaschenko;V. Chmyrev;M. Hayakawa
中科院分区：
文献类型：
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作者：
V. Sorokin;N. Isaev;A. Yaschenko;V. Chmyrev;M. Hayakawa
本文进一步发展了热带风暴和台风起源区上空电离层强电场形成的电动力学模型，并与卫星观测的直流电场和等离子体密度变化的新实验结果作了比较。根据这个模型，电场扰动的出现是由于在飓风对流区的带电水滴和气溶胶的向上传输所产生的大气-电离层电路的扰动。在考虑斜向地磁场和电离层共轭效应的情况下，计算了电离层直流电场的空间分布。COSMOS-1809卫星上的直接测量显示，在强大气扰动区，局部直流电场扰动的幅度高达25mV/m，伴随着等离子体密度变化δ n/n ≥ 6%。观测数据与理论模拟结果的比较表明，所考虑的模型充分描述了气象过程对电离层的电动影响。
This paper presents further development of the electrodynamic model of strong electric field formation in the ionosphere above the regions of tropical storm and typhoon origin and its comparison with new experimental results obtained from the satellite observations of DC electric field and plasma density variations over such regions. According to this model the electric field disturbance arises due to perturbation in the atmosphere–ionosphere electric circuit generated by the upward transport of charged water drops and aerosols in the hurricane convection zone. Calculations of spatial distribution of DC electric field in the ionosphere were carried out with the account of oblique geomagnetic field and the conjugate ionosphere effects. Direct measurements onboard the COSMOS-1809 satellite revealed localized DC electric field disturbances with magnitudes up to 25mV/m and accompanying plasma density variations δn/n ∼6% over the zones of strong atmospheric perturbations. Comparison of observational data with the results of theoretical modeling shows that the considered model adequately describes the electrodynamic impact of meteorological processes on the ionosphere.