Astrophysics and Space Science

, Volume 355, Issue 2, pp 347–352 | Cite as

Low energy secondary cosmic ray flux (gamma rays) monitoring and its constrains

  • Anil Raghav
  • Ankush Bhaskar
  • Virendra Yadav
  • Nitinkumar Bijewar
Original Article


Temporal variation of secondary cosmic rays (SCR) flux was measured during the full and new moon and days close to them at Department of Physics, University of Mumbai, Mumbai (Geomagnetic latitude: 10.6 °N), India. The measurements were done by using NaI (Tl) scintillation detector with energy threshold of 200 keV. The SCR flux showed sudden enhancement for approximately about 2 hour during few days out of all observations. The maximum enhancement in SCR flux is about 200 % as compared to the diurnal trend of SCR temporal variations. Weather parameters (temperature and relative humidity) were continuously monitored during all observations. The influences of geomagnetic field, interplanetary parameters and tidal effect on SCR flux have been considered. Summed spectra corresponding to enhancement duration indicates appearance of atmospheric radioactivity which shows single gamma ray line. Detail investigation revealed the presence of radioactive Ar41. Present study indicates origin of Ar41 could be due to anthropogenic source or due to gravitational tidal forces. This measurements point out limitations on low energy SCR flux monitoring. This study will help many researchers in measurements of SCR flux during eclipses and to find unknown mechanism behind decrease/increase in SCR flux during solar/lunar eclipse.


Secondary Cosmic Ray (SCR) Terrestrial gamma ray emission Atmospheric radioactivity Lunar tides Geomagnetic field Thermal neutron burst Newmoon Fullmoon Eclipse 


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Anil Raghav
    • 1
  • Ankush Bhaskar
    • 2
  • Virendra Yadav
    • 2
  • Nitinkumar Bijewar
    • 1
  1. 1.Department of PhysicsUniversity of MumbaiSantacruz (E)India
  2. 2.Indian Institute of GeomagnetismNew PanvelIndia

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