Weimer, D. R. (Iowa Univ. Iowa City, IA, United States)
Goertz, C. K. (Iowa Univ. Iowa City, IA, United States)
Gurnett, D. A. (Iowa, University Iowa City, United States)
Maynard, N. C. (USAF, Geophysics Laboratory, Bedford MA, United States)
Burch, J. L. (Southwest Research Institute San Antonio, TX, United States)