pubs/AIAA_2008-6438_JB2008_Model.pdf">http://sol.spacenvironment.net/~JB2008/pubs/AIAA_2008-6438_JB2008_Model.pdf</a></span><br>
      <span style="font-family: ms sans serif;"><big><big><span style="font-weight: bold;"></span></big></big></span><span style="font-family: &quot;MS Sans Serif&quot;;" lang="EN-US"><span style="font-family: MS Sans Serif;"></span></span><span style="font-family: ms sans serif;"><br>
      </span><span style="font-family: ms sans serif;"><a name="Carrara_1990"></a>Carrara, V. 