I t is sugg ested th a t th e origin o f som e o f th e tra n s ie n t ionic clouds, g e n e r ally assu m ed to be responsible for th e low level sp o rad ic ra d io reflexions, m a y be d u e to large cosm ic ra y show ers.I t is show n t h a t cascade cosm ic r a y show ers o f sufficient en erg y to p ro d u ce som e o f th ese rad io reflexions c e rta in ly ex ist, b u t th e re is insufficient p u b lish ed evidence to decide w h e th e r a n y o f th e echoes a lre a d y o b serv ed a re a c tu a lly due to such show ers. M ore conclusive ev idence co u ld be o b ta in ed from th e frequency-size d istrib u tio n of th e rad io echoes o b serv ed from a h o rizo n tal or v ertically d irec ted beam .
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