For outstanding contributions to magnetospheric and space physics by the developments of innovative instruments for research in VLF radio propagation and electric fields in space plasma.
A list of five major papers
〔１〕 Machida, S., and K. Tsuruda, Intensity and polarization characteristics of whistlers deduced from multi-station observations, J. Geophys. Res., 89, 1675-1682, 1984.
〔２〕 Tsuruda, K., H. Hayakawa, and M. Nakamura, Ion beams as diagnostic tools -DC electric field measurement in the ionosphere, Adv. Space Res., 8 (1), 165-174, 1988.
〔３〕 Tsuruda, K., H. Hayakawa, M. Nakamura, T. Okada, A. Matsuoka, F. S. Mozer, and R. Schmidt, Electric Field Measurements on the GEOTAIL Satellite, J. Geomag. Geoelectr., 46, 693-711, 1994.
〔４〕 Tsuruda, K., H. Hayakawa and M. Nakamura, Electric Field Measurements in the Magnetosphere by the Electron Beam Boomerang Technique, in ‘Measurement Techniques in Space Plasmas: Fields’ Geophysical Monograph 103, ed. R. F. Paff, J. E. Borovsky, and D. T. Young, 39-45, 1998.
〔５〕 Yamamoto, T., and K. Tsuruda, The PLANET-B mission, Earth Planets Space, 50, 175-181, 1998.