Comparative Magnetospheric Study using Riemann Approach

Details Comparative Magnetospheric Study using Riemann Approach Comparative Magnetospheric Study using Riemann Approach

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....7249k&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #7249

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Comparative magnetospheric study is essential to gain insight into the structure and inner workings of magnetospheres. The Earth's magnetosphere, due to both its accessibility and our interest in the space weather, has been the most studied of all the magnetospheres. Its study has led to major contributions to fundamental physics (e.g., magnetic reconnection, collisionless shocks, particle acceleration) as well as understanding of other magnetospheres. Other planets in our solar system also act as unique laboratories to test out our models and gain a better understanding of the terrestrial magnetosphere. Recently we have used global hybrid (fluid electron, kinetic ions) simulations to investigate the nature of solar wind interaction with magnetic dipoles of various strengths. We have found that magnetospheric structures go through phase transitions as the dipole strength is increased. As a supplement to these global simulations, we have cast the solar wind interaction with planets as a Riemann problem and examined the type of solutions that are possible using a hybrid code. Results show that the formation of the boundaries are captured well in these simulations and are in reasonable agreement with the global simulations. This facilitates a better understanding of the phase transition points by gaining insight into the solutions that are possible. Given the fact that these simulations are much less cpu intensive than the global runs, we plan to do a much wider parameter study using the Riemann code. The results of these simulations and their implications for formation of magnetospheres will be reviewed.

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