SUPERSONIC PROPAGATION OF AN IONIZATION FRONT IN LOW-DENSITY FOAM TARGETS DRIVEN BY THERMAL-RADIATION - AFSHARRAD, T; DESSELBERGER, M; DUNNE, M; EDWARDS, J; FOSTER, JM; HOARTY, D; JONES, MW; ROSE, SJ; ROSEN, PA; TAYLOR, R; WILLI, O (PHYSICAL REVIEW LETTERS, 1994)