Radio Emission of Meteor Bodies in the Extremely Low Frequency Range
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o Emission of Meteor Bodies in the Extremely Low Frequency Range A. D. Filonenko* Luhansk State University, Luhansk, 91000 Ukraine *e-mail: [email protected] Received April 3, 2018; revised January 28, 2020; accepted February 13, 2020
Abstract—A model for generating electromagnetic fields in the ELF/VLF range accompanying the final stage of the evolution of meteorites in the Earth’s atmosphere is presented. The phenomenon of low-frequency radio emission is an experimentally proven fact; however, the currently known generation models are not supported by numerical calculations that would not contradict the experimental facts. The present model does not resort to exotic hypotheses, but on the basis of well-known phenomena it shows how electromagnetic fields can be realized at the final stage of the meteoroid’s flight. The numerically obtained estimates of the electric field strength and the nature of the spectral intensity reflect the main features of the experimental measurements. Keywords: meteor, fireball, radio emission, spectrum, electron affinity, VLF DOI: 10.1134/S003809462004005X
INTRODUCTION The penetration of meteoric matter, cosmic dust, as well as cosmic rays (mainly nuclei of various atoms) into the Earth’s atmosphere causes many phenomena, including radio emission in a wide frequency range. For example, radio emission from charged particles moving at near-light speeds has been known for a relatively long time. About 60 years ago, a work was published (Askaryan, 1961), in which the generation of radiation from a wide air shower was first described, the essence of which is associated with coherent Cherenkov radiation of excess electrons. Later, this idea was supplemented and expanded in many works as applied to real showers (Filonenko, 2015). Electrical phenomena caused by fast-moving meteors do not always have a definite explanation. By direct measurements it was found that the passage of meteor bodies (MB) through the Earth’s atmosphere is accompanied by electromagnetic radiation. In addition to radiation known to all in the optical range, an MB emits in the radio-wave range. A relatively recently published work (Obenberger et al., 2014) reports on the detection of intrinsic meteor radiation by the LWA1 decameter radio telescope. Moreover, for many events, a correlation was established with optical radiation, which was recorded with the help of video cameras of the circular viewing network of the celestial sphere (AllSkyFireballNetwork). A thorough analysis of the radio signals showed that they cannot be a reflection of anthropogenic radio pulses from the ionized trace of the meteor, or any other types of radio
interference, but are only the result of the MB’s own radiation (Obenberger et al., 2015a, 2015b, 2016a, 2016b). A model of the self-emission of meteors was proposed in (Filonenko, 2018). The radiation characteristics calculated on the basis of its characteristics are in good agreement with experimental data (Obenberger et al., 2015a, 2015b, 2016a, 2016b). An equally interesting phenomenon was descr
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