Investigations Based on the 3D Distribution of Optical Emissions at High Latitudes Obtained by ALIS

Details Investigations Based on the 3D Distribution of Optical Emissions at High Latitudes Obtained by ALIS Investigations Based on the 3D Distribution of Optical Emissions at High Latitudes Obtained by ALIS

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa11b..08s&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA11B-08

Physics

0310 Airglow And Aurora, 2403 Active Experiments, 2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2494 Instruments And Techniques

Scientific paper

In this paper recent results from ALIS, the Auroral Large Imaging System, are presented. ALIS is a powerful system in Northern Scandinavia capable of doing 3D tomographic spectroradiometry. At present ALIS consists of six stations, spaced about 50 km. Each station has a CCD imager with a six-position filter wheel equipped with narrow-band interference filters. The field-of-view is roughly half all-sky. A positioning system enables imaging from several sites with overlapping fields-of-view for any desired part of the sky. To study the electrodynamics of an auroral arc ALIS images were used for tomographic reconstruction of the 3D distribution of the volume emission rate of aurora, and from that the initial differential particle flux was deduced. This particle flux was used as input into an auroral ionosphere model and ionospheric conductivities were calculated. Imaging of black aurora made it possible to draw conclusions about the causing mechanisms. In an experiment involving the EISCAT Heating facility the formation of an auroral arc was stimulated, leading to conclusions about the importance of a feedback mechanism.

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