GB/T 41214-2021 English PDF

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GB/T 41214-2021: Space environment (natural and artificial) - Methods for estimation of future geomagnetic activity
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Basic data

Standard ID: GB/T 41214-2021 (GB/T41214-2021)
Description (Translated English): Space environment (natural and artificial) - Methods for estimation of future geomagnetic activity
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: V04
Word Count Estimation: 29,288
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 41214-2021: Space environment (natural and artificial) - Methods for estimation of future geomagnetic activity

---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.
Space environment (natural and artificial) -- Methods for estimation of future geomagnetic activity ICS 49:140 CCSV04 National Standards of People's Republic of China Space environment (natural and artificial) Prediction method of geomagnetic activity (ISO 16698:2019, IDT) Published on 2021-12-31 2022-07-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration directory Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Symbols and Abbreviations 1 5 Basic parameters 1 5:1 Geomagnetic field changes 1 5:2 Quiet horizontal magnetic field and disturbed magnetic field 2 5:3 K index (single station 3h range index) 2 5:4 Kp, ∑Kp, ap and Ap indices (planetary index) 2 5:5 aa index (conjugate amplitude index) 4 5:6 Dst index (disturbance index during storm) 4 5:7 ASY and SYM indices (mid-latitude disturbance indices) 4 5:8 AU, AL, AE and AO indices (Auroral Current Collection Index) 5 5:9 am index 6 5:10 PC Index 7 5:11 Derivation and time delay in time resolution (selected for different levels of data) 7 6 Forecast classification8 6:1 Overview 8 6:2 Short-term forecasts8 6:3 Medium-term forecast8 6:4 Long-term forecast8 7 Forecasting methods9 7:1 Overview 9 7:2 Statistical model-based forecasting methods 9 7:3 Prediction methods based on physical principles 9 8 Evaluation of forecast effect9 8:1 Definition of forecast error 9 8:2 Evaluation method9 9 Compliance with Guidelines 10 9:1 Fundamentals 10 9:2 Forecast report 10 9:3 Documentation 10 9:4 Release 10 9:5 Archives 10 10 Useful Informative Literature 10 Appendix A (Informative) Web Sites Available for Geomagnetic Indices 11 Appendix B (Informative) Web site for publishing space weather forecasts and/or current reports12 Appendix C (Informative) Definitions for Different Types of Skill Scores13 Appendix D (informative) Useful literature related to the field of this document (not cited in this document) 14 Reference 21

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 of Standardization Documents" drafted: This document is equivalent to ISO 16698:2019 "Prediction methods for geomagnetic activity in the space environment (natural and artificial)": The following editorial changes have been made to this document: --- In Chapter 4 of this document, the unit of F10:7 flow in Chapter 4 of ISO 16698:2019 is modified to be "10-22 W/ (m2 Hz)", which are technical errata; --- In 9:3c) of this document, the typographical error "Chapter 4" in 1) of 9:3c) of ISO 16698:2019 is modified to "Chapter 6"; --- In Appendix C of this document, the formula (C:3) and formula (C:5) missing in Appendix C of ISO 16698:2019 are added; ---Modified the references to references in this document, and referred to references to foreign institutions in the ISO 16698:2019 section: Information or foreign literature should be changed to "See Reference [X]": Please note that some content of this document may be patented: The issuing agency of this document assumes no responsibility for identifying patents: This document is proposed by the Chinese Academy of Sciences: This document is under the jurisdiction of the National Standardization Technical Committee for Aerospace Technology and Its Application (SAC/TC425): This document is drafted by: National Space Science Center, Chinese Academy of Sciences: The main drafters of this document: Liu Fanghua, Zhong Qiuzhen, Chen Yanhong, Miao Juan, Li Zhitao, Li Changhong, Liu Siqing, Luo Bingxian:

Introduction

This document provides guidance for forecasting changes in geomagnetic activity: ---The geomagnetic index is used to describe the change of the magnetic field within a certain time range; --- Geomagnetic index is a measure used to describe the disturbance of the magnetosphere: This document measures the forecast accuracy and forecast method of the geomagnetic index based on three types of time scales: a) short-term forecast (1h to several days); b) medium-term forecast (weeks to months); c) Long-term forecast (six months to one solar activity week): These geomagnetic indices at different time scales are used as the magnetospheric magnetic field (ISO 22009), upper atmosphere (ISO 14222), ionospheric plasma (ISO 16457), magnetospheric charged particles, and other input parameters for models of the near-Earth space environment, these geomagnetic indices are also used for orbital lifetime predictions and electrostatic charging input parameters for the analysis of the harshest space environment: The three standards dealing with the Earth's magnetic field include ISO 16695 on the internal magnetic field, ISO 22009 on the magnetic field of the magnetosphere, and this document: Space environment (natural and artificial) Prediction method of geomagnetic activity

1 Scope

This document describes the forecast of geomagnetic indices used to forecast time scales ranging from short-term (hours to months) to long-term (months to years) method: This document applies to the forecast of the geomagnetic index and the space environment:

2 Normative references

There are no normative references in this document:

3 Terms and Definitions

There are no terms and definitions that need to be defined in this document: ISO and IEC maintain terminology databases for standardization at the following addresses: ---ISO online browsing platform: https://www:iso:org/obp; ---IEC Electropedia: http://www:electropedia:org/:

4 Symbols and Abbreviations

The following symbols and abbreviations apply to this document: Bs Southward component of the interplanetary magnetic field (when Bz≥0, Bs=0; when Bz< 0, Bs=Bz) Combination of north-south components of the Bz interplanetary magnetic field F10:7 flow The solar radio flow with a wavelength of 10:7 cm measured in Earth orbit, in units of 10-22 W/(m2·Hz) Glat Geographiclatitude Glon Geographic longitude IMF Interplanetary Magneticfield Mlat Geomagnetic latitude Mlon Geomagnetic longitude MHD Magnetohydrodynamics Sq Diurnal variation of geomagnetic field under solar quiet conditions (Solarquiet) UT Universal time (Universaltime)

5 basic parameters

5:1 Geomagnetic field changes The geomagnetic field is composed of internal and external fields: Intrinsic field (major part) is caused by source currents present in Earth's core and extrinsic field time-varying Induced currents in the solid Earth and oceans are generated over time, and exogenous fields are generated by magnetospheric and ionospheric currents: ......

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