Physics of auroral phenomena : proceedings of the 34th Annual seminar, Apatity, 01 - 04 March, 2011 / [ed.: A. G. Yahnin, A. A. Mochalov]. - Апатиты : Издательство Кольского научного центра РАН, 2011. - 231 с. : ил.

Classification o fspace weather complexes taking into account characteristics ofperturbing solar stream and its geomagnetic disturbance parameters direction for the second experiment (Fig. 2, Fig. 3 respectively) were obtained. These results have good agreement with ones of real tests of a neutron spectrometer. 3. The first real measurement Firstly in real measurement the spectrometer unit counter was totally covered neutron protection and proper count rate (“dark count”) was carried out. It was less than 0.2 min *. Then thermal neutron anisotropy was found. The detector window was opened and turned to upward to measure a neutron downward flux. The count rate was equal ~1 min'1. At last the detector window was turned to downward to measure a neutron upward flux. The count rate was equal ~ 0.5 min'1. In Fig. 4 count rate registered by the detector of downward and upward fluxes of thermal neutrons is presented. Fig. 4. Measurement of thermal neutron anisotropy. It is hour average. Downward and upward fluxes are marked 1 and 2 respectively. The fluxes are reduced to the dark count. Day of year Conclusions A new neutron spectrometer has been designed. The worth of it is in angular selectivity that is absent in a Bonner spectrometer. The important spectrometer features (as angular directivity, response function) have been simulated on GEANT-4 package. This has allowed investigating of the instrument response to neutrons and other particles of various energies from 0.1 eV up to 300 MeV. The working experimental model of a spectrometer is manufactured and its calibration is carried out. Measuring of the thermal neutron intensity at the ground has shown a significant anisotropy of neutron flux. References 1. Bramblett, R. L., Ewing, R. I. and Bonner, T. W. A new type of neutron spectrometer. Nucl. Instr. Meth. 9, 1-12 (1960). 2. Thomas, D. J., Alevra, A. V. Bonner sphere spectrometers - a critical review. Nucl. Instr. And Meth. A 476, 12- 20 ( 2002 ). 3. Pioch C., Mares V., Vashenyuk E.V., Balabin Yu.V., Ruehm W. Measurement of cosmic ray neutrons with Bonner sphere spectrometer and neutron monitor at 19° N // Nucl. Instr. and Meth. A (2010), doi: 10.1016/j.nima.2010.10.030. 4. http://www.geant4.org/geant4 105