Typically, a significant barrier of some kind is needed to disrupt the airflow in our upper atmosphere ... the lenticular ...

But there is limited concern regarding ... new particles could create more of these types of polar clouds—not only at the upper atmosphere, but also in the lower atmosphere, where cirrus clouds ...

There are bizarre goings on in Earth's upper atmosphere, and a new mission aims ... something very different is happening above the cloud tops. Known as Transient Luminous Events (TLEs), these ...