University of Oulu

Poluianov, S., Similä, M., Usoskin, I., Mishev, A., Kovaltsov, G., & Strauss, D. T. (2021, July 4). Pulse height-length analysis of data from neutron monitors DOMC/DOMB with a new data acquisition system. Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021). 37th International Cosmic Ray Conference.

Pulse height-length analysis of data from neutron monitors DOMC/DOMB with a new data acquisition system

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Author: Similä, Markus1; Poluianov, Stepan1; Usoskin, Ilya1;
Organizations: 1University of Oulu, 90014 Oulu, Finland
2Ioffe Physical-Technical Institute, St. Petersburg, Russia
3North-West University, Potchefstroom, South Africa
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.8 MB)
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Language: English
Published: Sissa, 2021
Publish Date: 2021-08-16


Two high-altitude polar neutron monitors DOMC and DOMB (Dome C, Concordia station, Antarctic plateau, 3233 m a.s.l.) received a major electronics upgrade in 2019. While a typical standard neutron monitor data acquisition (DAQ) system only registers the number of pulses from a cosmic-ray particle detector, the new system digitizes all pulses with 2 MHz sampling rate and stores this information in raw data files. This feature makes it possible to conduct a pulse height-length analysis of the neutron monitor data on a routine basis. In this study, we have analysed several months of the cosmic-ray data recorded with the new DAQ system during 2019–2020 (more than 10 million pulses). We identified several pulse branches corresponding to different processes: (a) secondary particles from individual cosmic-ray cascades, (b) noise, (c) double pulses originated from particles of the same local cascade, (d) high multiple pulses likely related to atmospheric muons, (e) double pulses potentially caused by contamination by neutrons scattered in the neighbouring instrument. We also studied the waiting time distributions of pulses and have shown that two peaks can be clearly distinguished: (1) at about 1 millisecond, which is related to the intra-cascade particles, and (2) at 30–1000 milliseconds related to different uncorrelated cosmic-ray cascades. Our conclusions are supported by theoretical estimates of the waiting times in different scenarios.

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Series: POS. Proceedings of science
ISSN: 1824-8039
ISSN-E: 1824-8039
ISSN-L: 1824-8039
Volume: 395
Article number: 1237
DOI: 10.22323/1.395.1237
Host publication: Proceedings of 37th International Cosmic Ray Conference (ICRC2021)
Conference: International Cosmic Ray Conference
Type of Publication: B3 Article in conference proceedings
Field of Science: 115 Astronomy and space science
Funding: The work is supported by the Academy of Finland (projects CRIPA-X No. 304435, ESPERA No. 321882, QUASARE 330064, HEAIM-2 330427), and Finnish Antarctic Research Program (FINNARP).
Academy of Finland Grant Number: 304435
Detailed Information: 304435 (Academy of Finland Funding decision)
321882 (Academy of Finland Funding decision)
330064 (Academy of Finland Funding decision)
330427 (Academy of Finland Funding decision)
Copyright information: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).