Meteorological effects on the counting rates with KM2A in scaler mode

Issued Date

2025-12-30

Resource Type

Conference Paper

eISSN

18248039

DOI

10.22323/1.501.0280

Scopus ID

2-s2.0-105029066770

Journal Title

Proceedings of Science

Volume

501

Rights Holder(s)

SCOPUS

Bibliographic Citation

Proceedings of Science Vol.501 (2025)

Suggested Citation

Cao Z., Aharonian F., Bai Y.X., Bao Y.W., Bastieri D., Bi X.J., Bi Y.J., Bian W., Bukevich A.V., Cai C.M., Cao W.Y., Cao Z., Chang J., Chang J.F., Chen A.M., Chen E.S., Chen G.H., Chen H.X., Chen L., Chen L., Chen M.J., Chen M.L., Chen Q.H., Chen S., Chen S.H., Chen S.Z., Chen T.L., Chen X.B., Chen X.J., Chen Y., Cheng N., Cheng Y.D., Chu M.C., Cui M.Y., Cui S.W., Cui X.H., Cui Y.D., Dai B.Z., Dai H.L., Dai Z.G., Danzengluobu, Diao Y.X., Dong X.Q., Duan K.K., Fan J.H., Fan Y.Z., Fang J., Fang J.H., Fang K., Feng C.F., Feng H., Feng L., Feng S.H., Feng X.T., Feng Y., Feng Y.L., Gabici S., Gao B., Gao C.D., Gao Q., Gao W., Gao W.K., Ge M.M., Ge T.T., Geng L.S., Giacinti G., Gong G.H., Gou Q.B., Gu M.H., Guo F.L., Guo J., Guo X.L., Guo Y.Q., Guo Y.Y., Han Y.A., Hannuksela O.A., Hasan M., He H.H., He H.N., He J.Y., He X.Y., He Y., Hernández-Cadena S., Hou B.W., Hou C., Hou X., Hu H.B., Hu S.C., Huang C., Huang D.H., Huang J.J., Huang T.Q., Huang W.J., Huang X.T., Huang X.Y., Huang Y., Huang Y.Y., Ji X.L., Jia H.Y., Jia K. Meteorological effects on the counting rates with KM2A in scaler mode. Proceedings of Science Vol.501 (2025). doi:10.22323/1.501.0280 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/114877

Title

Meteorological effects on the counting rates with KM2A in scaler mode

Author(s)

Cao Z.
 Aharonian F.
 Bai Y.X.
 Bao Y.W.
 Bastieri D.
 Bi X.J.
 Bi Y.J.
 Bian W.
 Bukevich A.V.
 Cai C.M.
 Cao W.Y.
 Cao Z.
 Chang J.
 Chang J.F.
 Chen A.M.
 Chen E.S.
 Chen G.H.
 Chen H.X.
 Chen L.
 Chen L.
 Chen M.J.
 Chen M.L.
 Chen Q.H.
 Chen S.
 Chen S.H.
 Chen S.Z.
 Chen T.L.
 Chen X.B.
 Chen X.J.
 Chen Y.
 Cheng N.
 Cheng Y.D.
 Chu M.C.
 Cui M.Y.
 Cui S.W.
 Cui X.H.
 Cui Y.D.
 Dai B.Z.
 Dai H.L.
 Dai Z.G.
 Danzengluobu
 Diao Y.X.
 Dong X.Q.
 Duan K.K.
 Fan J.H.
 Fan Y.Z.
 Fang J.
 Fang J.H.
 Fang K.
 Feng C.F.
 Feng H.
 Feng L.
 Feng S.H.
 Feng X.T.
 Feng Y.
 Feng Y.L.
 Gabici S.
 Gao B.
 Gao C.D.
 Gao Q.
 Gao W.
 Gao W.K.
 Ge M.M.
 Ge T.T.
 Geng L.S.
 Giacinti G.
 Gong G.H.
 Gou Q.B.
 Gu M.H.
 Guo F.L.
 Guo J.
 Guo X.L.
 Guo Y.Q.
 Guo Y.Y.
 Han Y.A.
 Hannuksela O.A.
 Hasan M.
 He H.H.
 He H.N.
 He J.Y.
 He X.Y.
 He Y.
 Hernández-Cadena S.
 Hou B.W.
 Hou C.
 Hou X.
 Hu H.B.
 Hu S.C.
 Huang C.
 Huang D.H.
 Huang J.J.
 Huang T.Q.
 Huang W.J.
 Huang X.T.
 Huang X.Y.
 Huang Y.
 Huang Y.Y.
 Ji X.L.
 Jia H.Y.
 Jia K.

Author's Affiliation

University of Chinese Academy of Sciences
 Tsinghua University
 Shanghai Jiao Tong University
 Sun Yat-Sen University
 University of Science and Technology of China
 Université Paris Cité
 Shandong University
 Nanjing University
 Chinese University of Hong Kong
 Zhengzhou University
 Southwest Jiaotong University
 Yunnan University
 Guangzhou University
 Institute of High Energy Physics, Chinese Academy of Sciences
 National Astronomical Observatories Chinese Academy of Sciences
 Max-Planck-Institut für Kernphysik
 Hebei Normal University
 Institute for Nuclear Research of the Russian Academy of Sciences
 Yerevan State University
 China Center of Advanced Science and Technology World Laboratory
 Zhejiang Lab
 Purple Mountain Observatory Chinese Academy of Sciences
 Shanghai Astronomical Observatory Chinese Academy of Sciences
 Yunnan Observatories
 Tibet University
 State Key Laboratory of Particle Detection & Electronics
 TIANFU Cosmic Ray Research Center
 School of Physics

Corresponding Author(s)

Cao Z.

Other Contributor(s)

Mahidol University

Abstract

The Large High Altitude Air Shower Observatory (LHAASO) consists of three sub-arrays: KM2A, WCDA and WFCTA. The KM2A contains 5216 electromagnetic particle detectors (EDs) and 1188 muon detectors (MDs). There are two common independent data acquisition systems, corresponding to the shower and scaler operation modes. In scaler mode, the KM2AED array is divided into 61 clusters. One cluster consists of 64 EDs (8 EDs × 8 EDs). For each cluster, the event rates of showers having a number of fired EDs within a time coincidence of 100 ns (particle multiplicities m) = 1, 2, 3, 4.. are recorded every 0.1 s. The scaler mode began acquiring data on June 21, 2023. In this study, we analyze the scaler mode data to study the meteorological effects on the counting rates with different multiplicities. Over long time periods, the distributions for all C<inf>i</inf> (means the counting rate for m = i) are influenced by meteorological parameters, such as the atmospheric pressure (P) and temperature (T). The counting rates decrease with increasing P and T. The correlation coefficients between the counting rates and the meteorological parameters are studied in this work. After correcting for meteorological effects, the counting rates become stable over long time periods, with C<inf>1</inf> following a Gaussian distribution and C<inf>2</inf>, C<inf>3</inf> and C<inf>4</inf> following Poisson distributions.

Keyword(s)

Multidisciplinary

Availability

URI

https://repository.li.mahidol.ac.th/handle/123456789/114877

Collections

Scopus 2025