Analysis of neutron monitor count rates and timing distributions from latitude surveys
| Author(s) | Yakum, P. | |
| Author(s) | Khamphakdee, S. | |
| Author(s) | Nuntiyakul, W. | |
| Author(s) | Sáiz, A. | |
| Author(s) | Ruffolo, D. | |
| Author(s) | Evenson, P. | |
| Author(s) | Bangliang, C. | |
| Author(s) | Seripienlert, A. | |
| Author(s) | Jiang, P. | |
| Author(s) | Chuanraksasat, P. | |
| Date Accessioned | 2024-02-22T21:20:00Z | |
| Date Available | 2024-02-22T21:20:00Z | |
| Publication Date | 2023-12-01 | |
| Description | This article was originally published in Journal of Physics: Conference Series. The version of record is available at: https://doi.org/10.1088/1742-6596/2653/1/012019 | |
| Abstract | Neutron monitors continuously record the hadronic part of secondary atmospheric radiation on the ground, which originates from primary cosmic rays. In Thailand, we developed a mobile neutron monitor housed inside a standard-size shipping container named "Changvan." It contains three neutron-sensitive proportional counters set up in the typical NM64 layout. However, the central counter doesn't have the lead producer, leading us to refer to it as a "semi-leaded" neutron monitor. We examined cosmic ray spectral variations on two latitude surveys during 2018-2019 and 2019-2020. This work examines the ratio of count rates between leaded and unleaded setups, which shows notable variation based on geomagnetic cutoff rigidity, suggesting a sensitivity to the cosmic ray spectrum. This measurement could be implemented at stationary stations. The unleaded counter, shielded by the reflector with a higher count from nearby lead, may have advantages over a bare one. Furthermore, we explore alternative techniques to identify spectral changes in Galactic cosmic rays using Changvan data. We analyze using time delay histograms to determine the leader fraction (L) of neutrons that are not preceded by another neutron from the same primary cosmic ray. We also examine other parameters, including the alpha (α) parameter and pulse rate (PR), which can be compared with count rates (CR). Our findings indicate that the ratios of L and α are not significantly affected by geomagnetic cutoff rigidity. In contrast, CR and PR exhibit significant dependency and show opposite trends. | |
| Sponsor | This work was supported by the Department of Physics and Materials Science, Faculty of Science, Chiang Mai University. We thank the grad school, Chiang Mai University for supporting the student scholarship of research assistance. This research was supported by NSRF via the Program Management Unit for Human Resources & Institutional Development, Research, and Innovation [grant number B39G660028] and by National Research Council of Thailand (NRCT): High-Potential Research Team Grant Program (N42A650868). | |
| Citation | Yakum, P, S Khamphakdee, W Nuntiyakul, A Sáiz, D Ruffolo, P Evenson, C Bangliang, et al. “Analysis of Neutron Monitor Count Rates and Timing Distributions from Latitude Surveys.” Journal of Physics: Conference Series 2653, no. 1 (December 1, 2023): 012019. https://doi.org/10.1088/1742-6596/2653/1/012019. | |
| ISSN | 1742-6596 | |
| URL | https://udspace.udel.edu/handle/19716/34014 | |
| Language | en_US | |
| Publisher | Journal of Physics: Conference Series | |
| dc.rights | Attribution 3.0 Unported | en |
| dc.rights.uri | https://creativecommons.org/licenses/by/3.0/ | |
| Title | Analysis of neutron monitor count rates and timing distributions from latitude surveys | |
| Type | Article |
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