Multi-wavelength modeling of an auroral arc observed with EISCAT and ALIS using the Aeroplanets model

In March 2008, a bright auroral arc was observed simultaneously by 4 stations of the Auroral Large Imaging System (ALIS), and by the European Incoherent Scatter Radar (EISCAT) in Northern Sweden and Norway. Using a tomography-like reconstruction technique (C. Simon Wedlund et al. 2013), it is possible to retrieve the volume emission rate of the green line of atomic oxygen (557.7nm) and of the N2+(B-X) first negative band emission at 427.8nm. From the 427.8nm emission in 2-D (latitude/longitude map), and independently from the EISCAT observation in 1D (along the line of sight), the electron precipitation spectrum at the top of the atmosphere could be estimated. In this work, we present the comparison of these emission rates with the output of the 1-D kinetic electron transport model Aeroplanets, which includes a very complete upper atmosphere physico-chemistry. We show that the model is able to model these emissions with great accuracy, which opens up the possibility to use Aeroplanets and ALIS at these wavelengths for more complex inversions and retrievals, such as thermospheric densities.