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This is the biggest contraction of the thermosphere in at least 43 years .

这是至少在43年中最大的热层收缩。

Was he in the troposphere , stratosphere , mesosphere or thermosphere ?

他在对流层、平流层、中间层还是电离层？

Apparently , thermosphere collapses do happen every so often , especially during periods of solar inactivity .

显而易见的是，热电离层的坍塌其实经常发生，尤其在太阳活动不是很频繁的时候。

The thermosphere interacts strongly with the sun and hence is greatly influenced by the sun 's solar activity , which occurs in cycles .

强烈的热层与太阳交互作用，因此受较大的周期发生的太阳活动影响。

The thermosphere lies high above earth 's surface , close to where the atmosphere meets space .

气热层位于地球表面的高处，接近大气层同太空相遇的部分。