For outstanding contributions to auroral physics by the pioneering auroral and rocket observations in Antarctica, and to the progress of polar sciences through extensive leadership on the polar research projects
A list of five major papers
1. Hirasawa, T. and Nagata, T. (1966): Spectral Analysis of Geomagnetic Pulsations from 0.5 to 100 sec in period for the Quiet Sun Condition. Pure and Applied geophysics, 65, 102-124.
2. Hirasawa, T., Nagata, T., Kawaguchi, S. and Hirao, K. (1970): Rocket Observations of Electron Density of the Daytime Ionosphere at Syowa Station, Antarctica. Rept. Ionos. Space Res. Japan, 24, 237-243.
3. Hirasawa, T. (1981): Effects of Magnetospheric Compression and Expansion on Spectral Structure of ULF Emissions. Mem. Natl. Inst. Polar Res., Spec. Issue, 18, 127-151.
4. Hirasawa, T. (1987): Japanese MAP Results in Antarctica. Mem. Natl. Inst. Polar Res., Spec. Issue, 48, 244-255.
5. Hirasawa, T. (1991): Sounding Rocket Experiment at Syowa Station, Antarctica. J. Space Tech. Sci. 7, 1, 9-17.