Ionospheric predictions.-
- Washington, D.C. : U.S. Government Printing Office, 1971.
- 3 vol.-
- (Telecommunications : research and engineering ; report 13). .
Vol. - The estimation of maximun usable frequencies from world maps of MUF (ZEROP)F2, MUF(4000)F2 and MUF(2000)- Vol.2 - Maximum usable frequenciesMUF(ZERO) F2, MUF(4000)F2, MUF(2000) E for a period of minimum solar activity, R12-10.- Vol.3 - Maximum usable frequencies MUF(ZERO) F2, MUF(4000)F2, MUF(2000)E for a maximum solar activity period of an average solar cycle, R12=110.