12-20 July 2017
Asia/Seoul timezone
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BEXCO - Room F(201/202/203/204)

[SH100] Characteristics of Forbush decreases measured by means of the new scintillation muon hodoscope ScMH


  • Igor YASHIN

Primary authors

  • Igor YASHIN (National Research Nuclear University MEPhI, Russia)



Muon flux is generated in the upper atmosphere as a result of interactions of primary cosmic rays (PCR) with nuclei of air atoms and, on the one hand, carries information about active processes in the heliosphere that modulate the PCR flux, and on the other hand, about processes of atmospheric origin that influence the intensity of secondary cosmic rays. Thus, measurements and analysis of muon flux intensity give a possibility to investigate different phenomena in heliosphere, magnetosphere and atmosphere of the Earth. The method based on the analysis of angular variations of muon flux detected in real time from all directions of the upper terrestrial hemisphere was named muon diagnostics. For implementation of this approach, the precise muon hodoscope URAGAN with a large area (about 46 sq. m) was constructed in MEPhI and is under operation since 2006. For further development of the method of muon diagnostics, a new scintillation muon hodoscope (ScMH) was created. The ScMH consists of four two-coordinate detection layers assembled from long narrow scintillation strips with WLS fiber light collection on 64-pixel MAPMT. The report presents results of investigations of characteristics of Forbush decreases that occurred in 2016 and were detected by the muon hodoscope ScMH. For this, barometric coefficients and differential temperature coefficients (DTC) were calculated, allowing to make corrections in the counting rate with considering of the temperature changes at all altitudes of the atmosphere. The obtained characteristics were compared with results of registration of the same events with the help of the URAGAN muon hodoscope. Comparison of results obtained with both detectors demonstrated a good agreement.