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The behavior of a lithospheric magnetization and magnetic field model

Earth and Planetary Physics 2023年第1期7卷 66-73页

作者： PengFei Liu Yi Jiang Qing Yan Ann MHirt State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacaoChina CNSA Macao Center for Space Exploration and Science MacaoChina Institute of Geophysics ETH ZürichSonneggstrasse 5CH-8095 ZürichSwitzerland

The Earth’s“lithosphere”is its outer shell,made up of the Earth’s crust and outermost *** part of the Earth’s magnetic field that originates in the lithosphere consists of a superposition of magnetic anomalies with a broad spectrum of sizes and intensities,which arise from geological and tectonic *** lithospheric magnetic field is known from surface observations,and on larger scales from above-surface *** increase in recent decades of satellites dedicated to measuring the Earth’s magnetic field has improved significantly our models of the Earth’s magnetic *** on these increasing observations,a number of comprehensive field models have been constructed,some of which focus solely on the lithosphere,such as the MF model *** present a map of lithospheric magnetic anomalies at 400 km altitude,based on a vertically integrated magnetization *** height was chosen because it is the expected orbital altitude of the Macao Science Satellite-1(mss-1)*** model presented herein indicates that the amplitude of the lithospheric anomalies at 400 km altitude is between-14.8 n T and 18.2 n *** information is useful because it provides a reference for the lithospheric source of the Earth’s magnetic field that contributes to the magnetic measurements made from satellite *** low inclination orbit of the mss-1 mission will provide information that is sensitive to lateral variation within the lithosphere;these variations arise from plate tectonic features with longitudinal *** conclusion,the new mss-1mission will provide valuable information in detecting compositional variations in the lithosphere,and in delineating large-scale geological structures.

关键词： vertically integrated magnetization lithospheric magnetic field field model mss-1

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Influences of various space current systems on the geomagnetic field in near-Earth space

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Earth and Planetary Physics 2023年第1期7卷 93-99页

作者： YaBing Wang Yi Zhang YuJie Wang PengFei Liu JianXia Cheng XiZhi Li Kai Tang LiGang Li XiaoWen Duan Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Shanghai Institute of Satellite Engineering Shanghai 201109China Shanghai Key Laboratory of Deep Space Exploration Technology Shanghai 201109China State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyTaipaMacaoChina

Ground and space-based observations of the geomagnetic field are usually a superposition of different sources from the Earth’s core,lithosphere,ocean,ionosphere,and magnetosphere,and also from field-aligned currents coupling the ionosphere and magnetosphere—the meridional currents that connect the two hemispheres and the induced currents due to the variations of fields over *** fluctuation of magnetic fields generated by these highly dynamic space currents greatly limits the accuracy of the geomagnetic *** order to better accomplish the scientific objectives of Macao Science Satellite-1(mss-1),and to improve existing geomagnetic field models,we present here for the first time a self-consistent coupling of solar wind,magnetosphere,and ionosphere,which represents the most developed numerical simulation method for space physics research so far,making it possible to quantify the contribution of different current systems to the total observed magnetic field(B).The results show that numerical simulation can capture main magnetic disturbance characteristics with significant *** ring current is a major contributor to the latitudinal magnetic perturbation near the *** and magnetotail currents affect the radial magnetic perturbation around the ***-aligned and Pedersen currents produce significant longitudinal and latitudinal magnetic perturbations at high latitudes.

关键词： mss-1 geomagqqnetic fields external current system numerical simulation

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