It is known that during solar flares, electrons are accelerated to high energies and electromagnetic radiation is generated in a wide range of frequencies. Fast electrons generate hard X-rays in solar plasma and can excite plasma waves. The latter generate electromagnetic waves recorded by radio telescopes on the Earth. It is known also that electron beams injected into plasma generate a reverse current, which consists of thermal electrons. The paper examines the effect of the reverse current electric field on the generation of plasma waves. It is shown that the reverse current of the electric field can cause a decrease in the intensity of the Langmuir waves excited in plasma and, consequently, the intensity of radio emission generated by plasma waves.
V. A. Dergachev (Wed,) studied this question.