N. I. Izhovkinaa, N. S. Erokhinb, and L. A. Mikhailovskayab
a Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation,
Russian Academy of Sciences, Troitsk, Moscow oblast, 142190 Russia
b Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117997 Russia
e-mail: izhovn@izmiran.ru
Received February 25, 2011; in final form, April 29, 2013
Abstract—The absorption of telemetry radiosignals at frequencies of 250 and 75 MHz, transmitted from rock-
ets, was observed in the ARAKS and Zarnitza 2 rocket experiments, respectively, with electron pulses in the
ionosphere. The signals were registered with ground receivers. Four cases of complete signal absorption on the
propagation path were observed in the ARAKS experiment. The radio absorption at frequencies substantially
higher than the plasma and upper hybrid frequencies can be related to wave scattering by plasma inhomogene-
ities. It has been indicated that plasma inhomogeneities were generated when electrostatic oscillations damped
in the region with decreased plasma density at a decrease in the natural oscillation phase volume in the fre-
quency–wave vector space with decreasing plasma density. The observed radio absorption could be related to
reflectionless wave scattering in an inhomogeneous plasma structure.
DOI: 10.1134/S0016793213060066
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