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Fejer, J.A.; Ierkic, H.M.; Woodman Pollitt, Ronald Francisco; Röttger, J.; Sulzer, M.; Behnke, R.A.; Veldhuis, A.
(American Geophysical Union, 1982)
During 5.1 MHz HF transmissions below the F-region penetration frequency by a nearby ionospheric modification facility, radar echoes coming from F-region heights at a frequency of 46.8 + 5.1 = 51.9 MHz were received while a VHF radar using the 305 m spherical reflector at Arecibo was transmitting ...