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SUMMARY:Relation of muon flux local anisotropy with primary spectrum index
DTSTART;VALUE=DATE-TIME:20161012T130000Z
DTEND;VALUE=DATE-TIME:20161012T131500Z
DTSTAMP;VALUE=DATE-TIME:20260712T090622Z
UID:indico-contribution-668@cern.ch
DESCRIPTION:Speakers: Anna Dmitrieva (National Research Nuclear University
  MEPhI (Moscow Engineering Physics Institute))\nURAGAN is a wide-aperture 
 precision muon hodoscope located in Moscow\, Russia\, 55.7$^\\circ$ N\, 37
 .7$^\\circ$ E\, 173 m a.s.l. It allows to obtain the angular distribution 
 of the muon flux. This distribution may be characterized by a vector of lo
 cal anisotropy (the sum of the vectors of the particle arrival directions\
 , normalized to the total number of muons). It was shown earlier that annu
 al variations in the vertical projection of the anisotropy vector $A_{\\rm
  Z}$ are observed\, and they are not related with changes in atmospheric c
 onditions. It was supposed that the annual variations are caused by change
 s in the shape of the energy spectrum of primary particles. The dependence
  of $A_{\\rm Z}$ on the index of the primary particles spectrum $\\gamma$ 
 was calculated for several zenith angle intervals with the help of simulat
 ion of generation and propagation of secondary cosmic ray particles throug
 h the atmosphere using the CORSIKA program package. Experimental temporal 
 series of the vertical projection of the local anisotropy $A_{\\rm Z}$ for
  several intervals of zenith angles were obtained for 2007-2015. For $A_{\
 \rm Z}$ estimations\, 1 h averaged muon matrices with corrections for baro
 metric and temperature effects were used. According to obtained $A_{\\rm Z
 }$ time series\, the average annual daily changes of $\\Delta\\gamma$ were
  estimated. Annual and daily changes in the slope of the energy distributi
 on of primary protons are observed. In the range of the mean energy of pri
 mary protons 70-110 GeV the annual changes of $\\gamma$ are 0.02-0.04\, an
 d the daily changes are 0.0025-0.004.\n\nhttps://indico.particle.mephi.ru/
 event/4/contributions/668/
LOCATION:Milan Hotel Verdi
URL:https://indico.particle.mephi.ru/event/4/contributions/668/
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