Plasma Double Layers

Double layers were described in 1929 by the plasma pioneer and Nobel laureate Irving Langmuir. They form when electric current flows through plasma. Another Nobel laureate, Hannes Alfvén, described a double layer as, “… a plasma formation by which a plasma — in the physical meaning of this word — protects itself from the environment. It is analogous to a cell wall by which a plasma—in the biological meaning of this word—protects itself from the environment.”
Cosmic Ions | thunderbolts TPOD