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Deriving the solar activity cycle modulation on cosmic ray intensity observed by Nagoya muon detector from October 1970 until December 2012

Published online by Cambridge University Press:  12 September 2017

Rafael R. S. de Mendonça Open the ORCID record for Rafael R. S. de Mendonça [Opens in a new window] ,
Carlos. R. Braga ,
Ezequiel Echer ,
Alisson Dal Lago ,
Marlos Rockenbach ,
Nelson J. Schuch  and
Kazuoki Munakata
Rafael R. S. de Mendonça
Affiliation:
Space Geophysics Division, National Institute for Space Research, São José dos Campos, SP, Brazil, email: [email protected]
Carlos. R. Braga
Affiliation:
Space Geophysics Division, National Institute for Space Research, São José dos Campos, SP, Brazil, email: [email protected]
Ezequiel Echer
Affiliation:
Space Geophysics Division, National Institute for Space Research, São José dos Campos, SP, Brazil, email: [email protected]
Alisson Dal Lago
Affiliation:
Space Geophysics Division, National Institute for Space Research, São José dos Campos, SP, Brazil, email: [email protected]
Marlos Rockenbach
Affiliation:
Space Geophysics Division, National Institute for Space Research, São José dos Campos, SP, Brazil, email: [email protected]
Nelson J. Schuch
Affiliation:
Southern Regional Space Research Center (CRS/INPE), P.O. Box 5021, 97110-970, Santa Maria, RS, Brazil
Kazuoki Munakata
Affiliation:
Physics Department, Shinshu University, Matsumoto, Nagano 390-8621, Japan
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Abstract

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It is well known that the cosmic ray intensity observed at the Earth's surface presents an 11 and 22-yr variations associated with the solar activity cycle. However, the observation and analysis of this modulation through ground muon detectors datahave been difficult due to the temperature effect. Furthermore, instrumental changes or temporary problems may difficult the analysis of these variations. In this work, we analyze the cosmic ray intensity observed since October 1970 until December 2012 by the Nagoya muon detector. We show the results obtained after analyzing all discontinuities and gaps present in this data and removing changes not related to natural phenomena. We also show the results found using the mass weighted method for eliminate the influence of atmospheric temperature changes on muon intensity observed at ground. As a preliminary result of our analyses, we show the solar cycle modulation in the muon intensity observed for more than 40 years.

Keywords

Solar Activity CycleCosmic Rays
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S328: Living Around Active Stars , October 2016 , pp. 130 - 133
Copyright
Copyright © International Astronomical Union 2017 

References

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