Different Alfvén wave acceleration processes of electrons in substorms at ~4-5 &amp;lt;i&amp;gt;R&amp;lt;sub&amp;gt;E&amp;lt;/sub&amp;gt;&amp;lt;/i&amp;gt; and 2-3 &amp;lt;i&amp;gt;R&amp;lt;sub&amp;gt;E&amp;lt;/sub&amp;gt;&amp;lt;/i&amp;gt; radial distance
Annales geophysicae