Comparison of relative sunspot numbers measured in Malaysia with international sunspot number calculated by SIDC-SILSO

2017 International Conference on Space Science and Communication

物理学;无线电电子学

Rasmani, N.^1 ; Hamid, N.S.A.^1 ; Kamarudin, F.^2 ; Kamil, W.M.A.W.M.^1 ; Sarudin, I.^1

School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi, Selangor

43600 UKM, Malaysia^1

National Space Agency, Banting, Selangor

42700, Malaysia^2

关键词: Correction factors;    Malaysia;    Sunspot number;    Working well;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/852/1/012004/pdf
DOI  :  10.1088/1742-6596/852/1/012004

来源: IOP

【 摘 要 】

The accuracy of Langkawi National Observatory (LNO) relative sunspot number (RSN) data has been officially acknowledged when LNO has become one of the contributors to International Sunspot Number (ISN), RISNsince June 2015. However, RSN from LNO (RLNO) can only be obtained if the weather is favourable and the instruments are working well. These disadvantages can be solved if there are other observers across Malaysia that can contribute data of RSN to LNO. This research aims to compare the RSN collected by an amateur observer at National Planetarium, RNPwith RLNOand RISN. 11 days data between the month of November 2014 and January 2015 are analysed to see the differences between RNPto both RLNOand RISN. Results show that, the value of RNPis lower than RLNOand RISN. The highest percentage difference is between RNPand RISNwhich is due to the different method and instruments used in observing the sunspot. The correlation of relative sunspot number is high between RLNOand RISNproving the reliability of LNO as contributor to ISN. The observational index is also determined in this study based on the ratio of correction factor of RNPto RLNO.