An edition of IQSY data of ionospheric absorption at Akita, from 1 January 1964 to 31 December 1965 (1967)

IQSY data of ionospheric absorption at Akita, from 1 January 1964 to 31 December 1965.

National Committee for the International Years of the Quiet Sun, National Committee for the International Geophysical Coordination, Science Council of Japan.

By Nihon Gakujutsu Kaigi. Taiyō Kyokushōki Kokusai Kansokunen Shōiinkai.