标准编号：ISO 16695:2014
中文名称：空间环境（自然和人工） 地磁参考模型
英文名称：Space environment (natural and artificial) — Geomagnetic reference models
发布日期：2014-02
标准范围
This International Standard defines reference models representing the geomagnetic field. It closelymirrors and clarifies specifications which have been in use for many decades.The approach is to represent the corresponding scalar magnetic potential by a spherical harmonicexpansion having specified numerical coefficients, called Gauss coefficients. This International Standardcovers models in which, at any one time, changes of the magnetic field are modelled by a linear timedependenceof each Gauss coefficient. A model might consist of a succession of sub-models, in each ofwhich the coefficients change linearly with time. For such a step-wise linear model, the coefficients arecontinuous in time. This International Standard provides the formulae and a step-by-step computationalprocedure to evaluate a geomagnetic reference model for any desired location and date.This International Standard does not specify the interpretation of the geophysical content of ageomagnetic reference model. It is left to the producer of a model to specify which internal and externalmagnetic sources are included in (or excluded from) their model.
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