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Large scale magnetic fields and response of dayside Venus ionosphere

机译：大型磁场和日间金星电离层的响应

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When solar wind dynamic pressure is close to or more than the subsolar ionospheric thermal pressure (overpressure conditions), the Venus ionosphere is permeated with large scale horizontal magnetic fields. There were speculations that these fields basically represented conditions, which could inhibit: (l)vertical diffusive transport, thereby affecting the vertical ion and electron distribution and (2) vertical thermal conduction, thereby affecting the vertical ion and electron temperatures. We therefore first review the main features of these fields and then present and discuss different results reported by various authors on the effects of these fields on the ionospheric plasma. We point out that an important feature of the ionospheric plasma as well as of the magnetic fields, in this context, is that both of these are limited to altitudes below 200 km during these overpressure conditions and here local equilibrium conditions prevail. Latest observational results indicate that these solar wind induced fields that do not have any detectable effect on the Venus ionosphere. These observational results are also discussed in the light of ionospheric measurements at Mars.
机译：当太阳风的动压接近或大于太阳下电离层热压力（超压条件）时，金星电离层会渗透到大规模的水平磁场中。推测这些场基本上代表了条件，这些条件可能会抑制：（1）垂直扩散传输，从而影响垂直离子和电子的分布，以及（2）垂直热传导，从而影响垂直离子和电子的温度。因此，我们首先回顾这些场的主要特征，然后介绍并讨论由不同作者报告的关于这些场对电离层等离子体影响的不同结果。我们指出，在这种情况下，电离层等离子体以及磁场的一个重要特征是，在这些超压条件下，这两者均限于200 km以下的高度，并且此处以局部平衡条件为准。最新的观测结果表明，这些太阳风感应场对金星电离层没有任何可检测的影响。还根据火星的电离层测量讨论了这些观测结果。

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