## 3 Analysis of Results and Discussion

Table 2: Characteristics of the current impulse of streamer corona on the cylinder model elements (average values). \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Amplification Coefficient** & **Group I** & **Group II** & **Group III** \\ \hline Upper level of the characteristic frequency, MHz & 6.8 & 5.2 & 9.5 \\ Frequency of the maximal intensity, MHz & 0.5 & 0.4 & 1.8 \\ Maximal intensity, A2 & 3600 & 800 & 200 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Spectral characteristics of the current impulse of streamer corona on the elongated model elements (average values). Presumably, such high frequencies appear in the spectrum of the electromagnetic radiation of the upward streamer discharges due to their development in a highly divergent electric field. This leads to the rapid rise in the discharge current. As seen in Tables 1 and 2, the maximal current rise velocity was observed on model elements from group II. Thus, it is suggested that the formation of electromagnetic radiation of the corona discharge in an avalanche and streamer form is presumably one of the key mechanisms of the electromagnetic influence on the discharge phenomena in artificial and natural storm cells and clouds that are located in the vicinity of model elements of cyber-physical objects, and systems in the super-high and ultra-high frequency range [15; 25; 26; 27]. According to [26], the electromagnetic radiation of avalanches formed from rods and long (cylindrical) electrodes and in the head of streamers in various large electric fields have an electromagnetic radiation that can be clearly expressed in the range of 4.0-5.0 MHz to 0.9-1.0 GHz, from 1.0-2.0 MHz to 0.5-0.6 GHz, and from 0.5-1.0 MHz to 8-10 GHz. Another source of such ultra-high electromagnetic radiation of the streamer flash, as proposed in [27], could be the result of the streamers colliding inside a streamer zone. Both of these electromagnetic radiation formation mechanisms correlate to the characteristic frequency ranges of the wavelet spectrums of signals, and are guided on model rods and long elements of the neighboring flash of the streamer corona; these develop from another model element belonging to group II and group III, containing large force-strength factors of the electric field. Electromagnetic radiation with frequencies exceeding 1 GHz during streamer flashes in the electric field of a cloud charged with water drops was registered in [28] as well. The possible electromagnetic effects of upward streamer flash on elements of transmission line monitoring systems in the determined characteristic spectral ranges are speculated. If upward streamer discharges form on the sensors (especially the rod kind, and on those included in group III) of the monitoring system, frequencies that are in the spectrum of a current impulse (up to dozens or hundreds of megahertz) will be in the working frequency range of the sensor. This could lead to sensor failure, including errors in the digital processing of data by the analog-digital converters [11; 12; 13; 29]. Similar failures may also be encountered when the electromagnetic radiation of streamer corona flash originates near the monitoring, diagnostic, and control systems that affect its elements (e.g., sensors). Failures may also occur if analog-digital converters with working frequencies from several hundred kilohertz to several gigahertz are used for subsequent digital processing of the measuring information [5; 6; 8; 11]. The electromagnetic radiation of the streamer corona flash ranging from hundreds of megahertz to gigahertz could impact nearby receiving/transmitting devices, and result in disruption, distortion, or a loss in informational transmission [8; 11; 12]. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Amplification Coefficient** & **Group I** & **Group II** & **Group III** \\ \hline Upper level of the characteristic frequency, MHz & 111 & 795 & 397 \\ Frequency of the maximal intensity, MHz & 10 & 76 & 27 \\ Maximal intensity, A2 & 10 & 14 & 9 \\ \hline \hline \end{tabular}
\end{table}