GR translation: Overhead the sky is busy, streaming, a living plasma

[Mike Jing]

V626.20-26   Double-declutchingly, heel-and-toe, away goes Roger Mexico.
Down the summer Autobahn, expansion joints booming rhythmic under his
wheels, he highballs a pre-Hitler Horch 870B through the burntpurple
rolling of the Lüneburg Heath. Over the windscreen mild winds blow down on
him, smelling of junipers. Heidschnucken sheep out there rest as still as
fallen clouds. The bogs and broom go speeding by. Overhead the sky is busy,
streaming, a living plasma.

What kind of plasma is being referred to here?
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