Lower ionosphere model of the polar regions during summer noontime

Measurements of various parameters in both Arctic and Antarctic mesosphere are available in the literature. These have been first examined to identify the similarities and differences between them in the two polar regions. Then an attempt has been made to reproduce them using an ion-chemical scheme in which both positive and negative ion processes have been included. Temperature and nitric oxide density are found to play a crucial role in the formation of these features. Finally a theoretical model of ion composition for Antarctic summer noontime condition is given.