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Earth and Planetary Physics 2022年第1期6卷 52-60页

作者： XiaoWen Hu GuoQiang Wang zonghao pan Chinese Academy of Sciences Key Laboratory of Geospace Environment School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Institute of Space Science and Applied Technology Harbin Institute of TechnologyShenzhen 518055China

The space-borne fluxgate magnetometer(FGM)requires regular in-flight calibration to obtain its zero offset.Recently,Wang GQ and pan ZH(2021a)developed a new method for the zero offset calibration based on the properties of Alfvén waves.They found that an optimal offset line(OOL)exists in the offset cube for a pure Alfvén wave and that the zero offset can be determined by the intersection of at least two nonparallel OOLs.Because no pure Alfvén waves exist in the interplanetary magnetic field,calculation of the zero offset relies on the selection of highly Alfvénic fluctuation events.Here,we propose an automatic procedure to find highly Alfvénic fluctuations in the solar wind and calculate the zero offset.This procedure includes three parts:(1)selecting potential Alfvénic fluctuation events,(2)obtaining the OOL,and(3)determining the zero offset.We tested our automatic procedure by applying it to the magnetic field data measured by the FGM onboard the Venus Express.The tests revealed that our automatic procedure was able to achieve results as good as those determined by the Davis-Smith method.One advantage of our procedure is that the selection criteria and the process for selecting the highly Alfvénic fluctuation events are simpler.Our automatic procedure could also be applied to find fluctuation events for the Davis-Smith method.

关键词： fluxgate magnetometer in-flight calibration zero offset highly Alfvénic fluctuations automatic procedure

Ground calibration of the Mars orbiter magnetometer onboard Tianwen-1

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Earth and Planetary Physics 2023年第3期7卷 371-377页

作者： ManMing Chen Kai Liu XiaoWen Hu YiRen Li XinJun Hao zonghao pan School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Chinese Academy of Sciences Center for Excellence in Comparative Planetology University of Science and Technology of ChinaHefei 230026China

Ground calibration experiments of the Mars orbiter magnetometer(MOMAG)onboard the orbiter of Tianwen-1 were performed to determine the sensitivity,misalignment angle,and offset of the sensors.The linearity of the applied calibrated magnetic fields and the output from the sensors were confirmed to be better than 10^(-4),and the sensor axes were orthogonal to each other within 0.5 degrees.The temperature dependencies of the sensitivity and misalignment angle were examined,but no clear signatures of temperature dependencies could be seen.Sensor offset and the stability of sensor offset drift with a temperature change were also determined by the rotation method.The stability of the sensor offset drift was less than 0.01 nT/℃.The ground calibration of MOMAG determines all the calibration parameters of the sensors for accurate magnetic field measurements in orbit with the appropriate corrections.

关键词： Mars orbiter magnetometer Tianwen-1 ground calibration

The Mars orbiter magnetometer of Tianwen-1:in-flight performance and first science results

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Earth and Planetary Physics 2023年第2期7卷 216-228页

作者： YuMing Wang TieLong Zhang GuoQiang Wang SuDong Xiao ZhuXuan Zou Long Cheng zonghao pan Kai Liu XinJun Hao YiRen Li ManMing Chen ZhouBin Zhang Wei Yan ZhenPeng Su ZhiYong Wu ChengLong Shen YuTian Chi MengJiao Xu JingNan Guo Yang Du School of Earth and Space Sciences/Deep Space Exploration Laboratory University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Comparative Planetology/CAS Key Laboratory of Geospace Environment/Mengcheng National Geophysical Observatory University of Science and Technology of ChinaHefei 230026China Space Research Institute Austrian Academy of SciencesGrazAustria Institute of Space Science and Applied Technology Harbin Institute of TechnologyShenzhen 518055China National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China Institute of Deep Space Sciences Deep Space Exploration LaboratoryHefei 230026China Shanghai Institute of Satellite Engineering Shanghai 201109China

The Mars Orbiter MAGnetometer(MOMAG)is a scientific instrument onboard the orbiter of China’s first mission for Mars—Tianwen-1.Since November 13,2021,it has been recording magnetic field data from the solar wind to the magnetic pile-up region surrounding Mars.Here we present its in-flight performance and first science results,based on its first one and one-half months’data.Comparing these early MOMAG observations to the magnetic field data in the solar wind from NASA’s Mars Atmosphere and Volatile EvolutioN(MAVEN)mission,we report that the MOMAG magnetic field data are at the same level in magnitude,and describe the same magnetic structures with similar variations in three components.We recognize 158 clear bow shock(BS)crossings in these MOMAG data;their locations match well statistically with the modeled average BS.We also identify and compare five pairs of datasets collected when Tianwen-1’s orbiter and the MAVEN probe made simultaneous BS crossings.These BS crossings confirm the global shape of modeled BS,as well as the south-north asymmetry of the Martian BS.Two cases presented in this paper suggest that the BS is probably more dynamic at flank than near the nose.So far,MOMAG performs well,and provides accurate magnetic field vectors.MOMAG is continuously scanning the magnetic field surrounding Mars.Data from MOMAG’s measurements complement data from MAVEN and will undoubt edly advance our understanding of the plasma environment of Mars.

关键词： Mars magnetic field Tianwen-1 magnetometer bow shock

Mars Orbiter magnetometer of China’s First Mars Mission Tianwen-1

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Earth and Planetary Physics 2020年第4期4卷 384-389页

作者： Kai Liu XinJun Hao YiRen Li TieLong Zhang zonghao pan ManMing Chen XiaoWen Hu Xin Li ChengLong Shen YuMing Wang Chinese Academy of Sciences Key Laboratory of Geospace Environment School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Chinese Academy of Sciences Center for Excellence in Comparative Planetology University of Science and Technology of ChinaHefei 230026China Space Research Institute Austrian Academy of SciencesGrazAustria

As one of the seven scientific payloads on board the Tianwen-1 orbiter,the Mars Orbiter Magnetometer(MOMAG)will measure the magnetic fields of and surrounding Mars to study its space environment and the interaction with the solar wind.The instrument consists of two identical triaxial fluxgate magnetometer sensors,mounted on a 3.19 meter-long boom with a seperation of about 90 cm.The dual-magnetometers configuration will help eliminate the magnetic field interference generated by the spacecraft platform and payloads.The sensors are controlled by an electric box mounted inside the orbiter.Each magnetometer measures the ambient vector magnetic field over a wide dynamic range(to 10,000 nT per axis)with a resolution of 1.19 pT.Both magnetometers sample the ambient magnetic field at an intrinsic frequency of 128 Hz,but will operate in a model with alternating frequency between 1 and 32 Hz to meet telemetry allocations.

关键词： Mars magnetic field magnetometer Tianwen-1 spaceflight instrumentation

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海上风机桩-筒复合基础基频特性分析

浙江工业大学学报 2024年第2期52卷 142-148页

作者：袁宗浩姚云龙何奔李娜许丹婷潘晓东浙江工业大学土木工程学院浙江杭州310023 中国电建集团华东勘测设计研究院有限公司浙江杭州311122

桩-筒复合基础作为海上风机的一种新型基础型式,在提高单桩承载力方面相较于单桩基础具有一定优势,然而筒体对风机结构基频特性的影响规律尚不明确。为研究该问题,对风机塔筒进行解析建模,结合有限元,建立了不同几何尺寸的单桩基础和桩... 详细信息

桩-筒复合基础作为海上风机的一种新型基础型式,在提高单桩承载力方面相较于单桩基础具有一定优势,然而筒体对风机结构基频特性的影响规律尚不明确。为研究该问题,对风机塔筒进行解析建模,结合有限元,建立了不同几何尺寸的单桩基础和桩-筒复合基础,将数值模型获得的基础刚度与上部塔筒解析模型进行耦合,提出了分析风机整机结构基频特性的有限元-解析耦合法。研究结果表明有限元-解析耦合法能够快速地实现风机整机结构基频预测。对比桩-筒复合基础与单桩基础基频特性发现:筒体的加入能有效提升单桩基础刚度,可以在不改变单桩基础桩径的前提下,有效提升结构第一阶固有频率,筒外径对基础基频的影响比筒壁高的影响更大。

关键词：第一阶固有频率有限元-解析耦合法桩-筒复合基础基础刚度动力特性

First results of the low energy ion spectrometer onboard a Chinese geosynchronous satellite

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Science China(Technological Sciences) 2023年第5期66卷 1378-1384页

作者： SHAN Xu MIAO Bin CAO Zhe SUN ZhenYu LI YiRen LIU Kai GUO XingYu QU SanBiao SU ZhenPeng SHEN ChengLong pan zonghao LI Xin HAO XinJun YANG XiaoPing TIAN Chao JIANG Yu LIU ShuBin AN Qi CHEN XiangJun WANG YuMing Hefei National Research Center for Physical Sciences at the Microscale Department of Modern PhysicsUniversity of Science and Technology of ChinaHefei230026China CAS Key Laboratory of Geospace Environment School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei230026China State Key Laboratory of Particle Detection and Electronics(IHEP-USTC) Department of Modern PhysicsUniversity of Science and Technology of ChinaHefei230026China Shandong Institute of Space Electronic Technology Yantai264003China State Key Laboratory of Astronautic Dynamics Xi’an Satellite Control CenterXi’an710043China CAS Center for Excellence in Comparative Planetology University of Science and Technology of ChinaHefei230026China

A Chinese geosynchronous satellite was launched on June 23,2020.It carried a plasma detection package to monitor the space environment around the orbit.Here we report the inflight performance of a low energy ion spectrometer(LEIS),one of the primary instruments in the plasma detection package,and its initial observations in flight.Benefiting from the state-of-the-art design of a top-hat electrostatic analyzer cooperated with angular scanning deflectors,three-dimensional measurement of ions in space with a large field of view of 360°×90°and a wide energy range from 50 eV to 25 keV per charge has been achieved.The differential energy flux spectra of ions around the orbit have shown clear signatures of surface charging and storm/substorm ion injections.The occurrence of surface charging could be caused by the lack of photoemission at the Earth's eclipse(near the midnight)or the storm energetic electron injection at the dawn sector.The present results demonstrated a good performance of the LEIS payload in flight for monitoring the space ion environment around the orbit.In situ measurements of the LEIS payload provide us an opportunity to understand the magnetospheric ion dynamics and forecast the associate space weather impacts.

关键词： low energy ion spectrometer geosynchronous orbit inflight measurement differential energy flux surface charging storm/substorm

In-flight calibration of the magnetometer on the Mars orbiter of Tianwen-1

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Science China(Technological Sciences) 2023年第8期66卷 2396-2405页

作者： ZOU ZhuXuan WANG YuMing ZHANG TieLong WANG GuoQiang XIAO SuDong pan zonghao ZHANG ZhouBin YAN Wei DU Yang CHI YuTian CHENG Long WU ZhiYong HAO XinJun LI YiRen LIU Kai CHEN ManMing SU ZhenPeng SHEN ChengLong XU MengJiao GUO JingNan School of Earth and Space Sciences/Deep Space Exploration Laboratory University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Comparative Planetology/CAS Key Laboratory of Geospace Environment/Mengcheng National Geophysical Observatory University of Science and Technology of ChinaHefei 230026China Space Research Institute Austrian Academy of SciencesGraz 8010Austria Institute of Space Science and Applied Technology Harbin Institute of TechnologyShenzhen 518055China National Astronomical Observatories Chinese Academy of SciencesBeijing 100080China Shanghai Institute of Satellite Engineering Shanghai 200240China Institute of Deep Space Sciences Deep Space Exploration LaboratoryHefei 230026China

Mars orbiter magnetometer(MOMAG)is one of seven science payloads onboard Tianwen-1’s orbiter.Unlike most of the satellites,Tianwen-1’s orbiter is not magnetically cleaned,and the boom where placed the magnetometer’s sensors is not long enough.These pose many challenges to the magnetic field data processing.In this study,we introduce the in-flight calibration process of the Tianwen-1/MOMAG.The magnetic interference including spacecraft generated dynamic field and the slowlychanging zero offsets are cleaned in sequence.Then the calibrated magnetic field data are compared with the data from the Mars atmosphere and volatile Evolutio N(MAVEN).We find that some physical structures in the solar wind are consistent between the two data sets,and the distributions of the magnetic field strength in the solar wind are very similar.These results suggest that the in-flight calibration of the MOMAG is successful and the MOMAG provides reliable data for scientific research.

关键词： magnetometer in-flight calibration Martian magnetic field Tianwen-1

Evaporated potassium chloride for double-sided interfacial passivation in inverted planar perovskite solar cells

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Journal of Energy Chemistry 2021年第3期30卷 493-500页

作者： Shasha Zhang Xiaobo Yan zonghao Liu Hongmei Zhu Zhichun Yang Yuqian Huang Sanwan Liu Di Wu Ming pan Wei Chen Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074HubeiChina China-EU Institute for Clean and Renewable Energy Huazhong University of Science and TechnologyWuhan 430074HubeiChina Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450001HenanChina

Defect-induced charge carrier recombination at the interfaces between perovskite and adjacent charge transport layers restricts further improvements in the device performance of perovskite solar cells(PSCs).Defect passivation at these interfaces can reduce trap states and inhibit the induced nonradiative recombination.Herein,we report a double-sided interfacial passivation via simply evaporating potassium chloride(DIP-KCl)at both the hole transport layer(HTL)/perovskite and perovskite/electron transport layer(ETL)interfaces in inverted planar PSCs.We demonstrate that the bottom KCl layer at the HTL/perovskite interface not only reduces the interfacial defects and improves the interfacial contact,but also leads to increased perovskite crystallinity,while the top KCl layer at the perovskite/ETL interface efficiently passivates the perovskite top surface defects and facilitates electron extraction at this interface.Thus,suppressed nonradiative recombination and faster charge extraction at both interfaces close to the perovskite layer can be achieved by using our DIP-KCl strategy.As a result,inverted PSCs based on DIP-KCl present an increased efficiency from 17.1% to 19.2% and enhanced stability,retaining over 90% of their initial efficiency after aging at maximum power point tracking for 1000 h.This work provides a simple and efficient way for defect passivation to further increase the efficiency and stability of PSCs.

关键词： Double-sided interfacial passivation KCl Defect passivation Nonradiative recombination Perovskite solar cells

基于磁镜结构的Wang-pan方法在磁强计在轨标定中的应用

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地球物理学报 2022年第6期65卷 1940-1950页

作者：胡小文王国强潘宗浩张铁龙中国科学技术大学地球和空间科学学院合肥230026 哈尔滨工业大学(深圳)空间科学与应用技术研究院广东深圳518055 奥地利科学院空间研究所格拉茨A-8042

磁通门磁强计(FGM)的磁补偿随时间会发生缓慢变化;因此,提高FGM磁补偿的标定精度对实现高精度磁场测量至关重要.最近,一种基于磁镜结构的标定方法被提出,本文将其称之为Wang-pan方法Ⅱ.本文分析了Wang-pan方法Ⅱ在太阳风、地球磁鞘和磁... 详细信息

磁通门磁强计(FGM)的磁补偿随时间会发生缓慢变化;因此,提高FGM磁补偿的标定精度对实现高精度磁场测量至关重要.最近,一种基于磁镜结构的标定方法被提出,本文将其称之为Wang-pan方法Ⅱ.本文分析了Wang-pan方法Ⅱ在太阳风、地球磁鞘和磁尾电流片区域的适用性.我们发现,磁镜结构或线性磁洞事件个数的增加有助于降低Wang-pan方法Ⅱ的计算误差;此外,事件的背景磁场强度和磁场耗散程度会显著影响Wang-pan方法Ⅱ的计算精度.Wang-pan方法Ⅱ在太阳风和磁尾电流片中的计算误差在±0.2 nT以内的概率高达70%,在磁鞘中计算误差比太阳风及磁尾电流片中的大了约1个数量级.为了提高利用磁镜结构标定磁补偿值的精度,我们研究了线性磁洞事件的多个参数特征对磁补偿计算误差的影响,该研究结果将为Wang-pan方法Ⅱ的应用提供磁镜结构或线性磁洞事件的筛选参考准则.

关键词：磁通门磁强计磁补偿在轨标定磁镜结构线性磁洞

阿尔芬波总磁场存在漂移趋势时磁通门磁强计在轨标定的优化方法

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地球物理学报 2022年第5期65卷 1558-1570页

作者：程甚男王国强潘宗浩孟立飞易忠张铁龙哈尔滨工业大学(深圳)空间科学与应用技术研究院深圳518055 中国科学技术大学地球和空间科学学院合肥230026 北京卫星环境工程研究所北京100094 奥地利科学院空间研究所格拉茨A-8042

高精度的磁场测量对深空探测具有重要意义,然而卫星上磁通门磁强计的磁补偿值会随着时间缓慢变化,需要进行在轨标定.近期,一种新的在轨标定方法被提出,即Wang-pan方法.该方法发现阿尔芬波动存在一个线性度高的最优补偿曲线,利用多个波... 详细信息

高精度的磁场测量对深空探测具有重要意义,然而卫星上磁通门磁强计的磁补偿值会随着时间缓慢变化,需要进行在轨标定.近期,一种新的在轨标定方法被提出,即Wang-pan方法.该方法发现阿尔芬波动存在一个线性度高的最优补偿曲线,利用多个波动的最优补偿曲线可计算出磁强计的磁补偿.然而,该方法没有考虑所选波动事件的总磁场存在漂移趋势的情况.本文通过数值分析,发现阿尔芬波总磁场存在漂移趋势时最优补偿曲线会偏离真实的磁补偿值,甚至不再具有较高的线性度,从而产生计算误差;将该漂移趋势去除之后,可显著降低Wang-pan方法的计算误差.我们利用金星快车的磁场数据验证了该优化方案的可行性.本文的研究成果有助于将Wang-pan方法应用于地球磁层卫星.

关键词：磁通门磁强计在轨标定阿尔芬波动磁补偿