In-orbit Calibration of the Hard X-ray Detector Units onboard the Macao Science Satellite-1B
In-orbit Calibration of the Hard X-ray Detector Units onboard the Macao Science Satellite-1B
Ng, Dr. Man-Hei Shi, Dr. Yongqiang Li, Dr. Liansheng Chen, Dr. Jianwu Ding, Dr. Qi 1Zhang, Dr. Xiaoping Luo, Dr. Pengwei
作者信息
- 1. Macau University of Science and Technology State Key Laboratory of Lunar and Planetary Sciences
- 折叠
摘要
Hard X-ray observation is a key tool for investigating high-energy processes in solar flares. The energy and efficiency calibrations of the hard X-ray detectors directly determine the scientific reliability of in-orbit data. This study focuses on the hard X-ray detection unit of the solar X-ray detector (SXD) onboard the Macau Science Satellite-1B and carries out spectral calibration of its observational data. On the one hand, Geant4 Monte Carlo simulations are used to model the detection unit and derive its detection efficiency curve. On the other hand, analysis of the in-orbit spectra shows that both the characteristic peak of the 241Am radioactive source and the 511 keV electron-positron annihilation peak exhibit significant channel drifts. To correct these drifts, a daily energy-channel response calibration method is established. To verify the feasibility of the calibration approach, the GOES X2.5-class solar flare on 16 February 2024 is selected as a case study. The derived efficiency curve and the peak-drift correction procedure are jointly applied to produce corrected light curves and spectra, which are then compared with observations from the Advanced Space-based Solar Observatory (ASO-S). The results show that the detection efficiency curve and energy calibration method obtained in this work are accurate and reliable, and can effectively correct the in-orbit spectral peak drifts. This provides high-quality data support for the scientific use of hard X-ray observations from Macau Science Satellite-1B and for future studies of high-energy solar physics.
Abstract
Hard X-ray observation is a key tool for investigating high-energy processes in solar flares. The energy and efficiency calibrations of the hard X-ray detectors directly determine the scientific reliability of in-orbit data. This study focuses on the hard X-ray detection unit of the solar X-ray detector (SXD) onboard the Macau Science Satellite-1B and carries out spectral calibration of its observational data. On the one hand, Geant4 Monte Carlo simulations are used to model the detection unit and derive its detection efficiency curve. On the other hand, analysis of the in-orbit spectra shows that both the characteristic peak of the 241Am radioactive source and the 511 keV electron-positron annihilation peak exhibit significant channel drifts. To correct these drifts, a daily energy-channel response calibration method is established. To verify the feasibility of the calibration approach, the GOES X2.5-class solar flare on 16 February 2024 is selected as a case study. The derived efficiency curve and the peak-drift correction procedure are jointly applied to produce corrected light curves and spectra, which are then compared with observations from the Advanced Space-based Solar Observatory (ASO-S). The results show that the detection efficiency curve and energy calibration method obtained in this work are accurate and reliable, and can effectively correct the in-orbit spectral peak drifts. This provides high-quality data support for the scientific use of hard X-ray observations from Macau Science Satellite-1B and for future studies of high-energy solar physics.关键词
Macao Science Satellite-1B/efficiency calibration/Solar X-ray/GEANT4/Hard X-ray/Solar flares引用本文复制引用
Ng, Dr. Man-Hei,Shi, Dr. Yongqiang,Li, Dr. Liansheng,Chen, Dr. Jianwu,Ding, Dr. Qi,Zhang, Dr. Xiaoping,Luo, Dr. Pengwei.In-orbit Calibration of the Hard X-ray Detector Units onboard the Macao Science Satellite-1B[EB/OL].(2026-09-15)[2026-09-23].https://chinaxiv.org/abs/202609.00159.学科分类
天文学
