Overhead, the hazy sky was blurred by stratospheric clouds.

And all the while Long Reach continued to drift away, a ball of fire plunging through thin stratospheric clouds.

It also made extensive observations of volcanic aerosols and polar stratospheric clouds in the middle atmosphere.

Another requirement for polar stratospheric clouds is cold temperatures to ensure condensation and cloud production.

The polar stratospheric clouds had a warming effect on the poles, increasing temperatures by up to 20 C in the winter months.

A multitude of feedbacks also occurred in the models due to the polar stratospheric clouds' presence.

Separate model runs were used to determine the sustainability of the polar stratospheric clouds.

First, the low temperatures lead to the formation of polar stratospheric clouds, which are high-altitude.

The stratospheric cloud from the eruption persisted in the atmosphere for three years after the eruption.

Outside Antarctica, wind and higher temperatures prevent formation of stratospheric clouds.