GB/T 42214-2022 English PDF

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GB/T 42214-2022: Space environment - Model of high energy radiation at low altitudes(300 km～600 km)
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Basic data

Standard ID: GB/T 42214-2022 (GB/T42214-2022)
Description (Translated English): Space environment - Model of high energy radiation at low altitudes(300 km��600 km)
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: V06
Classification of International Standard: 49.140
Word Count Estimation: 10,174
Date of Issue: 2022-12-30
Date of Implementation: 2023-07-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 42214-2022: Space environment - Model of high energy radiation at low altitudes(300 km～600 km)

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 49.140 CCSV06 National Standards of People's Republic of China Space environment Low altitude (300km~600km) high energy radiation model altitudes(300km~600km) Posted on 2022-12-30 2023-07-01 implementation State Administration for Market Regulation Released by the National Standardization Management Committee

table of contents

Preface I Introduction II 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 General concepts and conventions 2 Appendix A (Informative) Differential Fluxes of Protons and Electrons Table 3 Reference 6

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents" drafting. This document is modified to adopt ISO 17761.2015 "Space Environment (Natural and Artificial) Low Altitude (300km~600km) High Energy Radiation Model". Compared with ISO 17761.2015, this document has made the following structural adjustments. --- Added the chapter "Normative References"; ---Chapter 3 corresponds to Chapter 2 in ISO 17761.2015, where 3.1~3.5 corresponds to 2.1~2.5 of ISO 17761.2015, add Added 3.6, 3.7. The technical differences between this document and ISO 17761.2015 and their reasons are as follows. --- Increase the expression of positrons and electrons and their energy ranges (see Chapter 1) to improve the accuracy of the use of this document; --- Changed the term "cut-off stiffness" to "geomagnetic cut-off stiffness" (see 3.3); --- Changed the definition of "geomagnetic coordinate system L and B" (see 3.4); --- The terms "positron" (see 3.6) and "flux" (see 3.7) have been added to facilitate the understanding and use of this document; --- Increased the provisions of the energy range of positrons and electrons (see Chapter 4). The following editorial changes have been made to this document. --- In order to coordinate with existing standards, change the name of the standard to "Space Environment Low Altitude (300km~600km) High Energy Radiation Model"; --- Changed the flux symbol (see Chapter 4 and Appendix A) to make the context consistent; --- Replaced ISO 15390 with the informative referenced GB/T 37834 (see Chapter 4); --- Changed the unit representation of differential flux (see Appendix A) to comply with industry practice; --- Changed some error values in the headers in Table A.1 and Table A.2. Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents. This document was proposed by the Chinese Academy of Sciences. This document is under the jurisdiction of the National Aerospace Technology and Its Application Standardization Technical Committee (SAC/TC425). This document is drafted by. Beijing Institute of Satellite Environmental Engineering, Shenzhen Xingdi Twin Technology Co., Ltd., Harbin Institute of Technology (Shenzhen), Beijing Aircraft Overall Design Department, National Space Science Center of Chinese Academy of Sciences, Harbin Institute of Technology, Tianjin Binhai New Area Microelectronics Research Institute, China Aerospace Standardization Institute. The main drafters of this document. Shen Zicai, Hu Yanqi, Yu Lantao, Wang Shijin, Ji Qizheng, Li Xingji, Liu Xiaoning, Zhao Yu, Feng Xueshang, Li Changhong, Wang Xinyue, Zhong Qiuzhen, Bi Jinshun, Chen Dong, Xu Dongyan, Zuo Pingbing, Yang Jianqun, Ge Lili, Peng Yuchuan, Liu Wei.

Introduction

This document is used to estimate the flux of energetic charged particles at low altitudes (300km~600km) in the Earth's magnetosphere. The high-energy galactic cosmic rays[2] incident on the earth interact with the atmosphere to produce various secondary components, mainly including electrons, protons, neutrons and gamma. Horse rays, in which charged particles will move along a certain trajectory under the action of the geomagnetic field [4]. A large number of secondary charged particles have a stiffness less than The geomagnetic cut-off rigidity can only move toward the outer space along the earth's magnetic force line[3], reaching the height of the satellite orbit and forming high-energy particle radiation around the earth bring. Some of the secondary protons are directly captured by the geomagnetic field to form the inner radiation belt, and these protons with energies greater than tens of MeV mainly come from The beta decay of albedo neutrons is the so-called "cosmic ray albedo neutron decay" (CRAND) mechanism. Based on the above mechanism, there is space in the Earth's equator In a ring-shaped high-energy particle radiation belt, that is, the Earth's radiation belt. Due to the offset of the geomagnetic dipole axis relative to the center of the earth, the Trapped particles can be observed at a low altitude of about 300km in the Western Anomaly Area (SAA). Based on observational data from the mid-1960s to the early 1970s, the AP-8 model of the United States gives the Earth-captured proton Radiation model [5]. Later, based on the Combined Release and Radiation Effects Satellite (CRRES), the Solar Anomaly and the Magnetosphere Particle Explorer/(Proton/Electron Sub) Telescope (SAMPEX/PET) and the NOAA/T IROS series The radiation environment model of low earth orbit (LEO) has been improved[6]~[8], which can be used to estimate the energies below about 100MeV. Some of these models take into account the long-term variation of the geomagnetic field and the drift of the South Atlantic Anomaly (SAA) [9]. The European Payload for Matter/Antimatter Exploration and Light Nuclear Astrophysics Research (PAMELA) mission to LEO high energy (energy approx. 100 MeV and above) cosmic rays have been measured more accurately[10], the model described in this paper is based on the measurement data of PAMELA (including Contains trapped particles and reflective particles). Space environment Low altitude (300km~600km) high energy radiation model

1 Scope

This document describes the charged particle flux in near-Earth space based on PAMELA in-orbit measurements. This document applies to protons with energy greater than 100 MeV to the geomagnetic cut-off stiffness at low altitudes (300km~600km), as well as energy Flux calculations of electrons and positrons greater than or equal to 70 MeV to the geomagnetic cutoff stiffness and used to determine the impact of energetic charged particles on spacecraft Effects on equipment or astronauts.

2 Normative references

This document has no normative references.

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 IGRF modelIGRFmodel The geomagnetic reference field represented by a series of spherical harmonics. Note. The International Association for Geomagnetism and Aerophysics (IAGA) is responsible for the development and revision of the IGRF model, and releases the coefficients every five years. 3.2 The measure of the momentum of a moving particle, its expression is. R=pc/Z In the formula. R --- particle magnetic stiffness; p --- the momentum of the particle; c --- the speed of light; Z --- The charge of the particle. 3.3 geomagnetic cut-offrigidity For any point in the Earth's magnetic field and a given incident direction, the smallest particle required for a cosmic particle to arrive at this point along that direction from infinity is sub-magnetic stiffness. [Source. GB/T 32452-2015, 3.7.1.12, modified] 3.4 The altitude and magnetic field coordinate system used to describe the spatial distribution of the differential flux j of geomagnetically trapped energetic particles. Note. B is the absolute value of the geomagnetic induction intensity at a certain spatial location. In the approximation of the geomagnetic dipole field, L is the point where the earth's magnetic field lines intersect the equatorial plane. ......

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