The ionosphere as a natural laboratory to study magnetized plasma turbulence

​Seminar by Bengt Eliasson, Strathclyde University, Glasgow.

 

Abstract of talk

The Earth’s ionosphere offers an unbounded, large-scale magnetized and inhomogeneous plasma that is ideal for studying physical processes involving controlled induced plasma turbulence. An electromagnetic wave injected into the overhead plasma excites small-scale electrostatic turbulence and self-organization of the plasma into magnetic field-aligned density striations. This leads to anomalous absorption of the electromagnetic wave at the upper hybrid layer. Electrostatic turbulence at the upper hybrid and critical layers lead to acceleration of energetic electrons that ionize the neutral gas. There are several observations of optical emissions and the formation of artificial plasma layers, sometimes descending from high to low altitudes within a few minutes (see figure). We present multi-scale numerical modelling of the electromagnetic wave propagation and induced small-scale turbulence, electron acceleration, and the formation of descending ionospheric layers. The physics is very rich and involves time-scales ranging from microseconds to minutes, and length-scales ranging from tens of kilometers to sub-meter scales.

EoS Research Spotlight (23 June 2016):
Patches of Low Electron Density Help to Heat the Ionosphere
Category Seminar
Location: Room F-N6115, Origo building north 6th floor, Fysikgården 1
Starts: 22 August, 2016, 13:30
Ends: 22 August, 2016, 15:00

Published: Mon 20 Jun 2016. Modified: Mon 27 Jun 2016