Convection electric fields and polar thermospheric winds
Convection electric fields and polar thermospheric winds
复制标题
对流电场和极地热层风
DOI：
10.1029/ja077i013p02328
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发表时间：
1972
影响因子：
--
通讯作者：
P. Banks
中科院分区：
文献类型：
--
作者：
J. Fedder;P. Banks
用地球极区对流电场的定性概念论证离子拖曳在建立热层风系中的重要性。最近的测量表明，10至40 mV/m的均匀电场是极冠电离层的一个常规特征。在一个简单的电离层模型中利用这些测量场计算了中性热层风。中性气体运动的时间尺度从F区高度的不到1小时到电离层发电机区的大约2小时不等。已经发现，大气的粘性在确定发电机区域的风方面是重要的。结果表明，离子温度提高了数百度，这是由于离子中性摩擦效应。此外，在极地热层的对流能量的总沉积率被证明是相同的数量级，由于太阳EUV辐射的吸收。这些结果的动力学和热力学的热层的影响进行了讨论。
Use of the qualitative ideas of convection electric fields over the earth's polar regions to demonstrate the importance of ion drag in establishing a thermospheric wind system. Recent measurements indicate that uniform electric fields of 10 to 40 mV/m are a regular feature of the polar-cap ionosphere. Calculations of the neutral thermospheric wind, using these measured fields in a simple ionospheric model, have been made. The time scale for motion of the neutral gas ranges from less than 1 hour at F-region heights to about 2 hours in the dynamo region of the ionosphere. It has been found that the viscosity of the atmosphere is important in determining the winds in the dynamo region. Results are given that show ion-temperature enhancements of hundreds of degrees that are due to ion-neutral frictional effects. In addition, the total deposition rate of convection energy in the polar thermosphere is shown to be of the same order of magnitude as that due to absorption of solar EUV radiation. The implications of these results for the dynamics and energetics of the thermosphere are discussed.