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The temperature effect in secondary cosmic rays (muons) observed at the ground: analysis of the Global MUON Detector Network data


de Mendonca, RRS and Braga, CR and Echer, E and Dal Lago, A and Munakata, K and Kuwabara, T and Kozai, M and Kato, C and Rockenbach, M and Schuch, NJ and Al Jassar, HK and Sharma, MM and Tokumaru, M and Duldig, ML and Humble, JE and Evenson, P and Sabbah, I, The temperature effect in secondary cosmic rays (muons) observed at the ground: analysis of the Global MUON Detector Network data, The Astrophysical Journal, 830, (2) Article 88. ISSN 0004-637X (2016) [Refereed Article]


Copyright Statement

2016. The American Astronomical Society

DOI: doi:10.3847/0004-637X/830/2/88


The analysis of cosmic ray intensity variation seen by muon detectors at Earth's surface can help us to understand astrophysical, solar, interplanetary and geomagnetic phenomena. However, before comparing cosmic ray intensity variations with extraterrestrial phenomena, it is necessary to take into account atmospheric effects such as the temperature effect. In this work, we analyzed this effect on the Global Muon Detector Network (GMDN), which is composed of four ground-based detectors, two in the northern hemisphere and two in the southern hemisphere. In general, we found a higher temperature influence on detectors located in the northern hemisphere. Besides that, we noticed that the seasonal temperature variation observed at the ground and at the altitude of maximum muon production are in antiphase for all GMDN locations (low-latitude regions). In this way, contrary to what is expected in high-latitude regions, the ground muon intensity decrease occurring during summertime would be related to both parts of the temperature effect (the negative and the positive). We analyzed several methods to describe the temperature effect on cosmic ray intensity. We found that the mass weighted method is the one that best reproduces the seasonal cosmic ray variation observed by the GMDN detectors and allows the highest correlation with long-term variation of the cosmic ray intensity seen by neutron monitors.

Item Details

Item Type:Refereed Article
Keywords:atmospheric effects, cosmic rays, solar-terrestrial relations, sun
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:High energy astrophysics and galactic cosmic rays
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Duldig, ML (Dr Marc Duldig)
UTAS Author:Humble, JE (Dr John Humble)
ID Code:111975
Year Published:2016
Web of Science® Times Cited:13
Deposited By:Mathematics and Physics
Deposited On:2016-10-18
Last Modified:2017-11-03
Downloads:165 View Download Statistics

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