34th Annual European Meeting on Atmospheric Studies by Optical Methods, Andenes, Norway, 27-31 August 2007

Modelling the mesospheric effects of solar short-wave radiation

C.-F. Enell1, B. Gustavsson2, P. T. Verronen3, E. Turunen1, Th.Ulich1, K. Kaila4, J. Stegman5, U. Brändström6, I. Sandahl6

1Sodankylä Geophysical Observatory, Sodankylä, Finland,
2Tromsø, Norway,
3Finnish Meteorological Institute, Helsinki, Finland,
4Dept of Physical Sciences, University of Oulu, Oulu, Finland,
5Dept of Meteorology, Stockholm University, Stockholm, Sweden,
6Institute for Space Physics, Kiruna, Sweden


Auroral electron precipitation enhances the concentrations of odd nitrogen (NOx) in the lower thermosphere. We here use three-dimensional estimates of electron energy deposition, based on ALIS data (radiance calibrated by means of star spectra), as an input to the Sodankylä coupled Ion-neutral Chemistry model (SIC). This enables us to quantify the production of odd nitrogen in an auroral event.

We plan to validate the results by coordinated ground-based and rocket measurements under auroral conditions during the HotPay 2 campaign, which will take place on Andøya in October 2007.