GB/T 42214-2022 in English
VALIDSpace environment—Model of high energy radiation at low altitudes (300km～600 km)
- Issued on:2022-12-30
- Implemented on:2023-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 42214-2022空间环境 低高度（300km～600 km）高能辐射模型》由TC425（全国宇航技术及其应用标准化技术委员会）归口，TC425SC1（全国宇航技术及其应用标准化技术委员会空间环境分会）执行，主管部门为中国科学院。
Introduction
In-depth interpretation of the National Standard of the People's Republic of China GB/T42214-2022
1. Overview of the Standard
GB/T42214-2022 "High-energy radiation model for low altitude (300km~600km) space environment" is based on ISO17761:2015 and is mainly applicable to the calculation of high-energy charged particle flux at low altitude (300km~600km) in the Earth's magnetosphere. The standard adds a "normative reference document" chapter, and supplements and improves the terms and definitions, including key concepts such as "geomagnetic cutoff stiffness", "geomagnetic coordinate system L and B" and "positron".
2. Comparison of standard frameworks
| Standard dimensions | GB/T42214-2022 | ISO17761:2015 | Difference analysis |
|---|---|---|---|
| Term definitions | Added terms such as "positron" and "flux" to improve the particle radiation environment model. | The definitions of "positron" and "flux" are not included. | The precise description of high-energy charged particles is supplemented. |
| Technical requirements | The energy range of protons, electrons and positrons and the calculation method of their flux within the altitude range of 300km~600km are clarified. | The accurate modeling of the radiation environment in Low Earth Orbit (LEO) is not involved. | The drift phenomenon in the South Atlantic Anomaly (SAA) is considered. |
| Application Scope | Applicable to the radiation protection assessment of spacecraft equipment and astronauts. | Mainly for theoretical research on space environment models. | The actual application scenarios are expanded and the engineering practicality is enhanced. |
3. Implementation Suggestions
Case Study: Radiation Protection in the South Atlantic Anomaly (SAA)
In the South Atlantic Anomaly, the flux of high-energy particles at low altitudes (about 300km) increases significantly. According to GB/T42214-2022 standard, the following measures are recommended:
- Use the IGRF model to monitor the changes in the geomagnetic field in real time.
- Refer to the differential flux table in Appendix A to evaluate the radiation dose at a specific orbital altitude.
- Combined with the GB/T37834 galactic cosmic ray model, optimize the spacecraft protection design.
The implementation of this standard will significantly enhance my country's technical level in the field of space environment research and provide a scientific basis for spacecraft design and astronaut protection. By following GB/T42214-2022, relevant institutions can more accurately assess and mitigating the risks brought by high-energy particle radiation.
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