They contain plasma density gradients and magnetic fields that often do a good job sparking auroras.
Not exact matches
It's true that space is a vacuum, but it's an imperfect vacuum because it
contains a low
density of particles like clouds of interstellar dust, space
plasma, and cosmic rays.
It will also focus separately on «targets» — ways of getting the
plasma into a stable,
contained state — and «drivers» — the systems for delivering energy into the
plasma to raise its temperature and
density.
The study focuses on two perfectly reflecting model plates, separated by any non-zero
density plasma, i.e. a charged gas which may
contain electrons only or electrons and positrons.