Abstract:In this short note we present results of background measurements carried out with polystyrene based cast plastic 12.0×12.0×3.0 cm 3 size scintillator counter with a wavelength shifting fibre and a multi-pixel Geiger mode avalanche photodiode readout in the Baksan underground laboratory at a depth of 200 metres of water equivalent. The total counting rate of the scintillator counter measured at this depth and at a threshold corresponding to ∼0.37 of a minimum ionizing particle is approximately 1.3 Hz.PACS (2008)
Используя метод диагностики электрического состояния грозовой атмосферы по вариациям вторичных частиц космических лучей, регистрируемых установкой «Ковёр» БНО ИЯИ РАН, обнаружено явление взаимного влияния магнитосферной бури и грозовой активности. Установлено, что во время магнитосферных суббурь малой мощности, на предварительной стадии и в начале фазы развития, возможно проникновение магнитосферно — ионосферных возмущений на средние широты (∼40° с.ш.) над грозовыми очагами. Этот эффект проявляется в виде диффузного свечения типа «полярное сияние» яркостью ∼3 ·10-4 кд·м-² и локальных возмущений электрического поля с характерной разностью потенциалов в тропосфере ±100 МВ. Зарегистрировано локальное магнитное возмущение (∼1 нТл), соответствующее возникновению локального вертикального тока в атмосфере, максимум которого совпал с началом взрывной фазы зарождения суббури.
Using the method of diagnosing the electrical state of a thunderstorm atmosphere by variations of the secondary particles of cosmic rays recorded by the Carpet air shower array of the Baksan Neutrino Observatory (North Caucasus), the phenomenon of the mutual influence of a magnetic storm and thunderstorm activity was discovered. It has been established that during magnetic substorms of low power, at the preliminary stage and at the beginning of the development phase, penetration of magnetospheric–ionospheric disturbances at mid latitudes (∼400 N) above lightning centers is possible. This effect manifests itself in the form of a diffuse glow of the aurora type with a brightness of ∼3 ·10-4 cd·m-² and local disturbances of the electric field with a characteristic potential difference in the troposphere of order of ±100 MV. A local magnetic disturbance (∼ 1 nT) was recorded, corresponding to the appearance of a local vertical current in the atmosphere, whose maximum coincided
with the beginning of the expansion phase of substorm nucleation.
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