The role Alfv\'en waves in the generation of Earth polar auroras

TL;DR

This paper reviews how Alfvén waves contribute to electron acceleration and the generation of Earth's polar auroras, highlighting their role in energy transfer from the solar wind.

Contribution

It provides a comprehensive review of Alfvénic acceleration processes and their significance in auroral zone dynamics, emphasizing their importance in magnetic energy transfer.

Findings

Alfvén waves play a key role in electron acceleration.

Alfvénic processes are crucial for auroral dynamics.

Review highlights the importance of Alfvén waves in energy transfer.

Abstract

The acceleration of electrons at 1-10 keV energies is the cause of the polar aurora displays, and an important factor of magnetic energy transfer from the solar wind to the Earth. Two main families of acceleration processes are observed: those based on coherent quasi-static structures called double layers, and those based of the propagation of Alfv\'en Waves (AW). This paper is a review of the Alfv\'enic acceleration processes, and of their role in the global dynamics of the auroral zone.