2005: Hannes Alfvèn Medal from the European Geosciences Union for outstanding contributions toward the understanding of solar system plasma processes

2004: Elected Member of the American Academy of Arts and Sciences

1998: Elected Member of the National Academy of Sciences

1994: Iowa Regents Award for Faculty Excellence, for a "sustained record of excellence"

1992: Elected Member of International Academy of Astronautics

1990: NASA Distinguished Scientific Achievement Award for research performed on the Uranus-Neptune phase of the Voyager mission

1990 M. L. Huit Award from The University of Iowa for "service and dedication to students of the University of Iowa"

1989: American Physical Society Division of Plasma Physics Award ($5,000) for "excellence in plasma physics"

1989: Distinguished Iowa Scientist Award from the Iowa Academy of Science

1989: John Adam Fleming Medal from the American Geophysical Union for "original research and technical leadership"

1987: Elected Fellow of the American Physical Society

1987: Governor of Iowa's Medal for "Science Achievement"

1986: NASA Space Act Award ($10,000) for "instrumentation development, and significant advancements and discoveries in space plasma wave and radio wave physics"

1980: NASA Distinguished Scientific Achievement Award for research performed on the Jupiter-Saturn phase of the Voyager mission

1978: John Howard Dellinger Gold Medal from the International Scientific Radio Union for "Distinguished research in radio physics"

1975: Senior U. S. Scientist Award from the Alexander von Humboldt Foundation 1971 Elected Fellow of the American Geophysical Union