GEOPHYSICS

Geophysical invariance of the ionospheric $\mathrm{F}$ region as a cause of the stability of round-the-world radio signal delay

G. S. Ivanov-Kholodnyi, Yu. K. Kalinin

Institute of Applied Geophysics of the USSR Academy of Sciences, Moscow

UDC: 550.385

Presented: A. N. Shchukin
Received: 22.02.1984