Seminars

Lecturer: Katarina Axelsson (IRF)
Date: 2012-04-26 10:30
Place: Aniara

Statistical study of spatial variations in diffuse aurora

Katarina Axelsson
Swedish Institute of Space Physics
Kiruna

Abstract:
Optical, radar and satellite measurements have demonstrated that diffuse aurora contains fine structures. Data analysis shows that these fine structures are a result of modulation of high energy precipitating electrons. Pitch angle diffusion in the loss cone due to interaction of whistler mode wave with plasma sheet electrons is the most feasible mechanism leading to high-energy electron precipitation. This suggests that the fine structure is an indication of modulations of the efficiency of the wave-particle interaction.
One type of such fine structures is regular, parallel auroral stripes. Spatial and temporal structures of diffuse aurora stripes can give us information about modulation mechanisms. In this study we use ALIS data for statistical study of such characteristics.


Created 2012-02-17 08:44:40 by Uwe Raffalski
Last changed 2012-04-26 08:50:28 by Mats Holmström