Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm22a0229s&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM22A-0229
Physics
0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 0342 Middle Atmosphere: Energy Deposition, 1535 Reversals (Process, Timescale, Magnetostratigraphy), 2716 Energetic Particles, Precipitating, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
During a geomagnetic polarity transition, the configuration and strength of the Earth's geomagnetic field can differ very much from the current state. This has consequences not only for the large-scale current systems, but also for the distribution of high-energy particle precipitation into the middle atmosphere, and therefore, for the composition of the middle atmosphere during and after large energetic particle events. Observations of the Earth's magnetic field during the last century show an increase of variability and a decrease of magnetic field strength. It has been argued that this might imply that a new polarity transition of the Earth's magnetic field is preparing to occur. This work is a multi-institutional collaboration aiming at modeling the magnetosphere during polarity transitions, the resulting energetic particle fluxes, and their effect on the middle atmospheric ozone concentration. We use MHD simulations and parametric modeling of the paleomagnetosphere to determine the geomagnetic field configuration for different transition scenarios. Particle orbits are traced and the resulting particle fluxes are used as input parameters in Monte-Carlo simulations of the mesospheric and stratospheric energy deposition and ionization. The effects on the composition of the middle atmosphere are investigated by means of a two-dimensional photochemistry and transport model. Although these models describe very different physical processes, links can be established through well-defined interfaces, and the chain of models allows us to study the global consequences of geomagnetic field reversals on system Earth.
Burrows John P.
Glassmeier K.-
Heber Bernd
Kallenrode M.
Kuenzi K. F.
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