Study on Charge of Dust Particles in Lower Polar Region of Double Maxwell Distributionormalsize
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摘要: 在大功率微波照射下，极区中层夏季回波（PMSE）会立刻消失，该现象被称为极区中层加热现象.在大功率微波照射极区中层时，电子在微波电场加速下产生的定向运动速度与热运动速度可以比拟，极区中层的尘埃等离子体服从双麦克斯韦分布.基于双麦克斯韦分布下尘埃粒子充电理论给出极区中层尘埃粒子的电荷分布，比较了大功率微波对极区中层加热前和加热时，尘埃粒子电荷以及极区中层电子浓度的变化.结果表明，采用大功率微波装置加热极区中层会影响电子对尘埃粒子的充电进而导致电子浓度变化，这对解释极区中层加热现象具有重要意义.Abstract: Polar Mesosphere Summer Echoes (PMSE) will disappear immediately under the condition of high power microwave irradiation, which is called heating phenomenon in the polar mesosphere. When the high power microwave irradiate the polar mesosphere, the directional motion velocity of the electrons under the acceleration of microwave electric field can be compared with the thermal motion velocity, and the dust plasma in the polar mesosphere obeys the dual Maxwell distribution. The charge distribution of dust particles in the polar mesosphere is given based on the charge theory of dust particles under double Maxwell distribution. The charge changes of dust particles and the electron concentration are compared before and during the high power microwave heating the polar mesosphere. The results show that heating the polar mesosphere with a high-power microwave device will affect the charge of electrons to dust particles and lead to the change of electron concentration, which is of great significance to further explain the phenomenon of heating in the polar mesosphere.
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