Sodankylä Ion and Neutral Chemistry Model (SIC)
SIC is a 1D atmospheric model that combines the complex ion chemistry scheme of the ionospheric D region with the chemistry of middle atmospheric minor neutral gases. We have used it extensively in studies of direct effects of particle precipitation in the mesosphere and upper stratosphere, with special focus on ozone and related species. For more information on SIC, go to the SIC web pages.

Whole Atmosphere Community Climate Model (WACCM)
WACCM is a comprehensive numerical model, spanning the range of altitude from the Earth's surface to the thermosphere. For more information, see the WACCM web pages. A special variant, WACCM-D, has been developed at FMI for particle precipitation studies, for details see Verronen et al. (2016) and Andersson et al. (2016).

FinROSE Chemistry-Transport Model
FinROSE is a global 3-dimensional chemistry-transport model designed for middle atmospheric studies We use it to study middle atmospheric dynamics and chemistry and effects of particle precipitation, for example NOx production and transport. For more information, see Päivärinta et al. (2016) and references therein.

ROSE is a global 3-dimensional mechanistic chemical model from NCAR. It is based on the model developed by Klaus Rose and Guy Brasseur. The model is typically run with a resolution of 5 deg. in latitude and 11.25 in longitude. There are 64 pressure levels from about 16 km to 190 km. The model's time step is adjustable and it has been set at 7.5 minutes. The model includes 29 chemical species. Model reaction rates are based on JPL recommendations. The model is initialized with diurnal mean mixing ratios taken from the SOCRATES 2-dimensional model. Daily dynamical lower boundary conditions are from NMC. Diurnal and semidiurnal tidal temperature, geopotential, and horizontal winds at the lower boundary are based on fields from the Global Scale Wave Model (GSWM). The gravity waves are described using parameterizations by Lindzen and Hines. Upper dynamical conditions are from the MSIS-model. Atmospheric Remote Sensing group has used mRose for comparisons with GOMOS and OSIRIS measurements and studies on diurnal variation of chemical species.

Radiative transfer: Monte Carlo model Siro
Siro is a fully spherical three-dimensional radiative transfer model. The multiple scattering integral for the Stokes vector of polarized radiation is solved by the adjoint walk Monte Carlo method. Currently, Siro is used for radiative transfer simulations in the wavelength range from 260 to 2400 nm, both in nadir and limb geometries.