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Joining of beo centre of exellence to european network of high mountain observatories.

Deliverables

BEO Moussala provides gamma background measurements, standard meteorological data, UV measurements, NOx and ozone gas analyzers, radioactivity in aerosols, clouds and precipitations, heavy and trace elements (Be7, Pb210) monitoring, real data transmission via Internet.
The improvement of the quality of the parabolic reflectors of the Cerenkov light telescope is caused by the necessity to reach as low as possible energy threshold of the registered events in attempt to obtain information about the shape of the energy spectrum of the primary cosmic ray flux. The starting point of the development was connected with the usage of two metallic (Aluminium) mirrors with reflection coefficient of the surface - 0.35 and diameter - 1m each. In order to increase the efficiency the collecting surface of the reflectors was covered with plastic coats. Therefore the next step of improvement used addition parabolic plastic sheets above the metallic one. The first experimental checks carried out with planar samples gave excellent results. Confirming the development of this technology several difficulties connected with the type of the metallization source and its work properties occurred. Finally, a reflection coefficient (0.75±5)% in the wavelength interval 300-600nm typical for the atmospheric Cerenkov light emission was obtained. By this way an additional decrease of the energy threshold by factor 3 was obtained. Finally we could point out that inside the subcontracts we succeed to realize simple technology for big size parabolic reflectors production with very good optical characteristics, which could be applied in other fields of research and techniques.
The computer network has been reorganized after the new wireless telecommunication system was established. The devices for real time measurements are connected by some interface to PC. The results of measurements are stored into files. Some new special scripts are running at local server based at BEO-Moussala. One of the scripts controls data-transfer of files for each of the measurements and preparation the data for transfer through new telecommunication system. The data is collecting to the server at every hour, but that interval can be easily changed. The other one of the scripts is checking the channel of new telecommunication system - if it sinks the data transfer is redirected through the old one communication system based on GSM-modems. On the server is installed the software which gives possibilities for sending of alarm notification in case of emergency (fire, robbery and etc.) if the sensors is switched to the server (there are no sensors at the moment). The reorganization of computer network guarantees non-stop real-time high-speed connection to the INTERNET.
BEO Moussala provides standard meteorological data, UV measurements, NOx and ozone gas analyzers, radioactivity in aerosols, clouds and precipitations, gamma background measurements, heavy and trace elements (Be7, Pb210) monitoring, real data transmission via Internet.
The Basic Environmental Observatory on peak Mussala provides a unique opportunity for constructing modern high-technology equipment to apply the method suggested by A.E.Chudakov (1972) that is the possibility of detecting the Cerenkov light signal reflected by snow surface. The special feature of that method is the possibility to use a sensitive area over some hundred square kilometres with comparatively small detectors Òhe Ice Lake is located in the Mussala circus region, at 220 m below the peak of Mussala (2925-m a.s.l). The area of the lake is approximately 16 da. Its surface retains a snow-cover approximately 7 to 8 months annually. The setting up is situated on the 212m high mountain ledges nearby Ice Lake and registers the Cerenkov light of the air showers reflected from the snow surface of the lake. Monte Carlo simulation of the detector response was done in order to estimate the expected characteristics of the telescope. After first registration of Cerenkov light pulses reflected from the Ice lake surface with oscilloscope, the two photomultipliers were connected to a coincidence circuit and the dependence of the number of coincidences per minute (counting rate) on the threshold of the discriminators was explored. The first measurements of the amplitude distribution of the anode pulses of the photo multipliers are made in the winter of 2003.
Automatic weather station (AWS) Vaisala is working with the full set of standard weather sensors: wind direction and velocity sensors; air humidity and temperature sensor; atmospheric pressure sensor; rain-gauge (precipitation meter). AWS works in automatic mode under the control of data collecting and visualization programme ''Your-VIEW''. Data files each hour in Vaisala type format are transferred to the server of the BEO in INRNE local network. From data files stored in the server database is accessible in graphs or text files via Internet. The AWS can be upgraded in the future with additional to the basic set of sensors. The system has the potential for commercial use for forecasting and for the purposes of the air transport. Other important information very closely related to the AWS data is received from Clouds Observing System which consists of 3 video cameras MK 2321 installed and interconnected with specialized software for video-observing for the purposes of atmospheric turbulence observation and analysis. The UV-meter is a device conceived and implemented in the frame of HIMONTONET project, which works under the specialized software created with Visual C++ compiler. Two variants of the device are in use for different parts of the UV-spectrum: UV-AB and UV-B. The devices are conceived for functioning in severe atmospheric condition.
High-speed telecommunication system for data transmission on 2.4 GHz radio-channel is implemented. The system allows reliable transmission of 2 Mbit/sec (8 Mbits optional) in real time between BEO-network server and the INRNE -network server. The telecommunication system is improved in its hardware and software part. Internet through the radio-channel is also accessible. Database, updated every hour, with graphical system for visualization of optionally selected environmental parameters, is created. The telecommunication system with BEO Moussala local network and Internet is the technical basis for future development of the technology of real time, remote controlled monitoring instruments.

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