Ivchenko, N.1, Lanchester, B.2, Dahlgren, H.1, Whiter, D.2, Marklund, G.1, Sergienko, T.3 and Gustavsson, B.4
1 KTH, Stockholm, Sweden
2 University of Southampton, Southampton, UK
3 IRF, Kiruna, Sweden
4 University of Tromsų, Norway
ASK (Auroral Structure and Kinetics) is a multispectral auroral instrument, consisting of three narrow field of view imagers and two photometers. The imagers are based on the iXon EMCCD detectors, and are fitted with custom made f=150mm, F/1 lenses, resulting in 3x3 degree field of view. Narrow passband filters are used in each of the imagers and photometers, providing simultaneous measurements in different emissions, with frame rates of up to 32 fps. Sets of imager filters include combinations of 777.4 nm (OI), 732.0 nm ([OII]), 562.0 nm (O2+), 673.0nm (N2), and 427.8 nm (N2+). Using these filters allows to estimate the energies and energy flows of auroral electrons, and potentially - by observing the afterglows in the forbidden oxygen ion line - ionospheric plasma flows. Since September 2006 until March 2007 ASK was operated at the mainland EISCAT site in Ramfjorden, Norway. Several coordinated campaigns were carried out, with both ASK and EISCAT pointing to the magnetic zenith. We present selected results on the morphology and time development of the fine structure in the aurora, and its effects in the ionosphere, as measured by the EISCAT radar.