If you wish to see an idealized version (without the influence of the solar wind), you can use Celestia with the magnetic field add-on.  The basic program can be found at http://www.shatters.net/celestia and the addon at http://www.celestiamotherlode.com.  There are a couple of tweaks to the add-on that allow you to show (or not) various field lines and particle pathways.

Regards,
Eric Pyle

---- Original message ----

Date: Tue, 4 Mar 2008 12:13:30 -0800
From: Tom-Pierre Frappé <[log in to unmask]>
Subject: good visualizations of the Earth's magnetic field?
To: [log in to unmask]
>Hi all,
>
>I am teaching an online course ( university level, 3rd year). My
>students are having a lot of difficulty visualizing the geomagnetic
>field, and making sense of how the declination/inclination changes
>spatially.
>
>Does anyone knows of good online visualization for the magnetic field of
>the Earth?
>
>3D would be best, and interactive simulations would be ideal, but I
>might be wishing for the moon... you can email me your suggestions off
>list, I'll compile them and send a summary back to the list-serve.
>
>many thanks for your suggestions!
>Tom-Pierre
>
>--
>Tom-Pierre Frappé
>EOS-Science Education Initiative / ECAC & EOSC114 Administrator
>Dept. Earth and Ocean Sciences
>University of British Columbia
>6339 Stores Road
>Vancouver, B.C.
>V6T 1Z4, Canada
>
>Phone:(604)822-3063
>fax: (604)822-6047
>[log in to unmask]
>
>