Synchrotron emission of weakly-relativistic electron beams at midlatitude ionospheric altitudes |
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| Authors: | S I Musatenko A V Agapitov E V Kurochka A S Slipchenko V V Fomichev A K Markeev S M Kutuzov |
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| Institution: | (1) Kiev Taras Shevchenko National University, Observatorna st. 3., Kiev, 04053, Ukraine;(2) Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation, Russian Academy of Sciences (IZMIRAN), Troitsk, Moscow oblast, 142190, Russia;(3) Astrocosmic Center, Russian Academy of Sciences, Russia |
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| Abstract: | Results of the spectral measurements of ionospheric noise in the meter band are presented. The events lasting several milliseconds (the emission maximum of which drifts upward (in frequency), is reflected (stops), and drifts downward) have been distinguished. Moreover, multiple harmonics are observed. The frequency-time structure of such events have been considered from the viewpoint of registration of the electron beam synchrotron emission harmonics at ionospheric altitudes in the geomagnetic field. The model calculations of the frequency-time structure of ionospheric radio noise bursts drifting in frequency have been performed taking into account the measurement conditions. It has been indicated that the model electron radio noise bursts agree with the measured bursts reflecting from the ionosphere at altitudes of 100–180 km. The model of the monoenergetic beam of electrons precipitating from the radiation belt (L ～ 2.0–2.8) into the ionosphere has been proposed. |
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