Abstract
The ionospheric feedback instability is discussed by using theconductivity argument. We give an exact quantitative descriptionto show that the free energy for this instability comes from thereduction of the Joule dissipation produced by the pre-existingconvection electric field through self-consistent changes inionization and conductivity due to Alfvénic perturbations inthe ionosphere. By the over-reflection of Alfvén waves, theenergy in the active ionosphere is pumped into the magnetosphere,which is contrary to the usual case whereby energy carried byAlfvén waves is deposited in the ionosphere by Jouledissipation. The ionospheric feedback enhances the electronE×B drift. The electron conductivity iscontrolled by the ion Perdersen conductivity rather than by theelectrons Pedersen conductivity. We also provide a qualitativetheoretical explanation to the intense aurora favoured by a lowerambient ionospheric conductivity in the ionospheric feedbackinstability.
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