The effective recombination rate in lower ionosphere during localised precipitation of auroral electrons

Thomas Ulich and Esa Turunen

Sodankylä Geophysical Observatory, FIN-99600 Sodankylä, Finland.


The EISCAT incoherent scatter radars are able to make high time-resolution measurements of electron density in the lower ionosphere. A series of localised electron precipitation events is analysed using the detailed time-dependent Sodankylš Ion Chemistry (SIC) model. Experimental determination of the effective recombination coefficient is used as a constraint to the model in order to analyse the response of ion and neutral composition to the precipitation.