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

[SH110] Analysis of the diurnal variation observed by the SMS muon detector on different solar cycle phases


  • Ana Clara DA SILVA PINTO

Primary authors



It is well known that the solar cycle is one of the agents that leads to changes in the transport of cosmic particles. This effect can be observed, for example, through changes in the cosmic ray diurnal intensity variation. In this work, we calculated the diurnal variation during the different phases of the solar cycle observed between 2007 and 2015. In order to do this, we used cosmic ray and atmospheric pressure data provided by the São Martinho da Serra (SMS) multidirectional muon detector located at the south region of Brazil (29.44ºS, 53.81ºW and 0.488 km above sea level), the atmospheric temperature data provided by the Global Data Assimilation System (GDAS) and the SILSO (Sunspot Index and Long-term Solar Observations) total daily sunspot number. First, we removed the atmospheric effects on the muon intensity calculating the barometric and mass weighted temperature coefficients by a multiple linear regression and analyzed the diurnal variation observed on the corrected and uncorrected data. After, we analyzed the diurnal variation on the descending phase of the solar cycle 23, the period of minimum between 2008 and 2009, the ascending, maximum and the initial descending phases of the solar cycle 24.