Yu. V. Shlyugaev

Experimental evidence of giant electron-gamma bursts generated by extensive atmospheric showers in thunderclouds

The existence of a new phenomena - giant electron-gamma bursts is established. The bursts are generated in thunderclouds as a result of the combined action of runaway breakdown and extensive atmosphere showers (RB-EAS). The experiments were fulfilled at the Tien Shan Mountain Scientific Station using EAS-Radio installation. This specially constructed installation consists of a wide spread EAS trigger array and a high time resolution radiointerferometer.

Radar studies using the “sura” facility

We review technical characteristics and applications of the VHF SURA radar based on the multipurpose research SURA facility of the Radiophysical Research Institute.

Angles of arrival of HF mesosphere radar echoes

The distribution of the angles of arrival of mesosphere radio echoes has been obtained and studied. Special attention has been paid to the region of altitudes in the vicinity of the mesopause. It has been indicated that the angle of arrival distribution in this region has a maximum near the direction toward the zenith and is anisotropic. At the same time, the average intensity of radio echoes substantially exceeds the background level for any angles of arrival.

The effect of the thunderstorm activity on the tien shan neutron monitor data

Variations in the neutron monitor counting rate at the at the mountain level (3340 m above sea level) during the passage of electrically charged clouds above the installation have been investigated. It is established that the decrease in the counting rate with respect to fair-weather level is due to positive values of the atmospheric electric field (∼40–50 kV m−1). This effect is observed in the low-energy part of the neutron component intensity and is absent in the high-energy part (neutron emission multiplicity exceeds 6).