Analysis of neutron monitor count rates and timing distributions from latitude surveys
Issued Date
2023-01-01
Resource Type
ISSN
17426588
eISSN
17426596
Scopus ID
2-s2.0-85181987481
Journal Title
Journal of Physics: Conference Series
Volume
2653
Issue
1
Rights Holder(s)
SCOPUS
Bibliographic Citation
Journal of Physics: Conference Series Vol.2653 No.1 (2023)
Suggested Citation
Yakum P., Khamphakdee S., Nuntiyakul W., Sáiz A., Ruffolo D., Evenson P., Bangliang C., Seripienlert A., Jiang P., Chuanraksasat P., Munakata K., Madsen J., Soonthornthum B., Komonjinda S. Analysis of neutron monitor count rates and timing distributions from latitude surveys. Journal of Physics: Conference Series Vol.2653 No.1 (2023). doi:10.1088/1742-6596/2653/1/012019 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/95584
Title
Analysis of neutron monitor count rates and timing distributions from latitude surveys
Corresponding Author(s)
Other Contributor(s)
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.