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ROMFORSK-Program for romforskning

Solar Atmospheric Modelling

Tildelt: kr 4,0 mill.

Solar magnetism lies at the root of most solar and heliospheric physics. The intricate structure of the solar field, the activity cycle and the influence of the field on the heliosphere represent major quests of (astro-) physics which bear directly on th e human environment. The sun's magnetic field is generated by enigmatic dynamo processes in the solar interior, is organized into the highly complex patterns of solar activity observed in the solar photosphere, dominates the structure of the outer solar a tmosphere (chromosphere, transition region, corona), regulates the solar wind, and affects the whole extended heliosphere into the Earth's upper atmosphere. Solar activity modulation affects satellite orbits, influences jet stream patterns and contributes to the causes of minor, and possibly major, ice ages. Through the "Modelling of Astrophysical Plasmas'' and the "Solar and Heliospheric Plasmas'' programs we have developed an expertise that is much sought after internationally. We have combined the ex pertise in the Oslo region in fields that traditionally have been partially separate disciplines: photospheric physics, studies of the solar chromosphere, transition region, corona and solar wind. We have developed the necessary tools and codes to treat 3 D radiation-magneto-hydrodynamics problems with a realistic treatment of the radiation. A wealth of observational data is now available through the highly successful SOHO (SOlar and Heliospheric Observatory) satellite and the Swedish 1m Solar Telescope ( SST). More data will arrive through the projects under development such as Solar-B, Solar Dynamics Observatory (SDO), Solar Orbiter and the Advanced Technology Solar Telescope. It is evident that the development of an understanding of the underlying physi cal processes is hampered by the lack of a corresponding concerted effort into theoretical modelling. The proposed project, "Solar Atmospheric Modelling'' aims at being such an effort.

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ROMFORSK-Program for romforskning

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