Computer Science
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....2493g&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #2493
Computer Science
Scientific paper
Since the Mariner 10 spacecraft encountered planet Mercury we know that the innermost planet of our solar system has a magnetosphere comparable to that one of the earth but smaller due to the larger solar wind dynamic pressure at Mercury's orbit and the smaller planetary field. The magnetopause distance is about one planetary radius R_P (1R_P=2439text{km}) and varies between 0.1 and 1.6 R_P because of changings in the solar wind conditions. This compression of the magnetosphere induces electric currents in the planet's core superposing a magnetic field to the planetary magnetic field. To study the size of this induced fields we have modelled the time-varying magnetosphere of Mercury using a Hilmer-Voigt approch and varied the magnetopause position in time. Computing the magnetic field at the planets surface allows to calculate the induced currents and thus the induced magnetic field. The total magnetic field consisting of planetary, induced and magnetospheric contributions is determined along polar spacecraft orbits around the planet. We find that the induced magnetic fields have a significant contribution to the total field on long-term magnetic field meassurements.
Glassmeier Karl-Heintz
Grosser Jan
Stadelmann Anja
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