Definition of Van Allen, James Alfred in English:

Van Allen, James Alfred

Pronunciation /ˌvan ˈalən/ /ˌvæn ˈælən/

proper noun

  • (1914–2006), US physicist. He used balloons and rockets to study cosmic radiation in the upper atmosphere and showed that specific zones of high radiation were the result of charged particles from the solar wind being trapped in two belts around the earth.