Abstract
Analysis of the radiation of solar radio bursts with a fine structure generated at a double plasma frequency makes it possible to obtain information on the energy density of Langmuir waves in solar plasma and on the volume of the region of the generation of radio emission when Langmuir waves merge. As an example, we consider the spectrum of a radio burst on August 17, 1999. Assuming that this radio burst is the result of the merging of Langmuir waves, a possible spectrum of Langmuir waves has been found. This makes it possible to explain the form of the particular spectrum of the radio burst, and the relationship between the volume of the emitting region and the energy density of Langmuir waves has been obtained. It is shown that the linear size of the emitting region can be ~108 cm or less. It is also shown that plasma inhomogeneity will lead to an increase in the width of the radio emission spectrum. Small (~10%) changes in the plasma concentration in discrete sources of radio emission may lead to the formation of local spectral maxima.
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This study was supported by the Russian Science Foundation, grant no. 18-29-21 016.
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Kudryavtsev, I.V., Kaltman, T.I. Spectral Diagnostics of Langmuir Coronal Plasma Turbulence Based on the Radio Emission at the Double Plasma Frequency. Geomagn. Aeron. 61, 1172–1177 (2021). https://doi.org/10.1134/S0016793221080120
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DOI: https://doi.org/10.1134/S0016793221080120