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The siphonic energy transfer between hot solar wind and cold martian ionosphere through open magnetic flux rope
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作者 Xiaojun Xu Lou-Chuang Lee +12 位作者 Qi Xu Qing Chang Jing Wang Ming Wang Shaosui Xu Christian Mosti Charles J.Farrugia Xing Wang Yudong Ye Zilu Zhou Lei Luo Peishan He Shaoguan Cheng 《Fundamental Research》 CAS CSCD 2024年第4期882-889,共8页
A mechanism for energy transfer from the solar wind to the Martian ionosphere through open magnetic flux rope is proposed based on the observations by Mars Atmosphere and Volatile EvolutioN(MAVEN).The satellite was lo... A mechanism for energy transfer from the solar wind to the Martian ionosphere through open magnetic flux rope is proposed based on the observations by Mars Atmosphere and Volatile EvolutioN(MAVEN).The satellite was located in the dayside magnetosheath at an altitude of about 70o km above the northern hemisphere.Collisions between the hot solar wind protons and the cold heavy ions/neutrals in the subsolar region can cool the protons and heat the heavy ions.As a result,the magnetosheath protons are siphoned into the ionosphere due to the thermal pressure gradient of protons and the heated heavy ions escape along the open magnetic field lines.Although direct collisions in the lower-altitude region were not detected,this physical process is demonstrated by MAVEN measurements of enhanced proton density,decreased proton temperature and oppositely directed motions of hot and cool protons within the flux rope,which are very different from the observational features of the flux transfer events near the Earth's magnetopause.This mechanism could universally exist in many contexts where a collisionless plasma region is connected to a collisional plasma region.By reconstructing the magnetic geometry and the cross-section of the flux rope using the Grad-Shafranov technique,the ion loss rates are quantitatively estimated to be on the order of 1023 s-l,which is much higher than previously estimated. 展开更多
关键词 MARS Flux rope solarwind IONOSPHERE Ion loss
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Potential and economic viability of standalone hybrid systems for a rural community of Sokoto, North-west Nigeria
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作者 O. D. OHIJEAGBON Oluseyi. O A JAYI 《Frontiers in Energy》 SCIE CSCD 2014年第2期145-159,共15页
An assessment of the potential and economic viability of standalone hybrid systems for an off-grid rural community of Sokoto, North-west Nigeria was conducted. A specific electric load profile was developed to suite t... An assessment of the potential and economic viability of standalone hybrid systems for an off-grid rural community of Sokoto, North-west Nigeria was conducted. A specific electric load profile was developed to suite the community consisting 200 homes, a school and a community health center. The data obtained from the Nigeria Meteorological Department, Oshodi, Lagos (daily mean wind speeds, and daily global solar radiation for 24 years from 1987 to 2010) were used. An assessment of the design that will optimally meet the daily load demand with a loss of load probability (LOLP) of 0.01 was performed, considering 3 stand-alone applications of photovoltaic (PV), wind and diesel, and 3 hybrid designs of wind-PV, wind-diesel, and solar-diesel. The diesel standalone system (DSS) was taken as the basis of comparison as the experimental location has no connection to a distribution network. The HOMER software optimizing tool was engaged following the feasibility analysis with the RETScreen software. The wind standalone system (WSS) was found to be the optimal means of producing renewable electricity in terms of life cycle cost as well as levelised cost of producing energy at $0.15/(kW. h). This is competitive with grid electricity, which is presently at a cost of approximately $0.09/(kW.h) and 410% better than the conventional DSS at a levelized cost of energy (LCOE) of $0.62/kWh. The WSS is proposed for communities around the study site. 展开更多
关键词 photovoltaic (PV) power wind power solarwind hybrid cost per kilowatt-hour clean energy
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慧星等离子物理(英文)
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作者 刘麟仲 《紫金山天文台台刊》 北大核心 1994年第3期11-20,共10页
The recent advances of comctary physics are outlined.
关键词 cornel solarwind PLASMA
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太阳风磁流体湍流串级率与质子加热率的比较研究
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作者 孙红岩 高嘉凌 涂传诒 《北京大学学报(自然科学版)》 CAS CSCD 北大核心 1994年第1期40-43,共4页
本文利用Tu和Marsch(1990)导出的串级函数和Helios飞船的观测数据计算了太阳风中磁流体湍流的串级率,计算表明当取a=0.41时,湍流能量串级率与质子加热率在0.3AU至1AU处有近似相同的径向变化。
关键词 太阳风 湍流 串级率 质子加热率
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Solarwind NPM中无法显示CPU和内存利用率
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作者 卢立云 《网络安全和信息化》 2019年第7期154-156,共3页
国内厂商的Solarwind NPM设备与国外不同,需要借助OID查看工具,通过添加国内厂商私有的OID值,才能在Solarwind NPM平台中显示。
关键词 OID solarwind NPM CPU
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月表磁异常影响的太阳风电子反射运动 被引量:3
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作者 冯永勇 徐荣栏 赵华 《空间科学学报》 CAS CSCD 北大核心 2009年第2期161-165,共5页
模拟太阳风电子向月表运动的轨迹,研究由于月表磁异常的存在造成的电子反射运动.首先设定行星际磁场B_(sw)指向月球并与月表垂直,将月表的磁异常区看成是一个磁偶极子,偶极矩大小为M_(cb);然后分别考察该偶极矩与行星际磁场方向平行,反... 模拟太阳风电子向月表运动的轨迹,研究由于月表磁异常的存在造成的电子反射运动.首先设定行星际磁场B_(sw)指向月球并与月表垂直,将月表的磁异常区看成是一个磁偶极子,偶极矩大小为M_(cb);然后分别考察该偶极矩与行星际磁场方向平行,反平行以及±90°的情形,通过计算发现,被反射的电子数目会随着磁偶极矩和行星际磁场的方向改变而改变.在偶极矩与行星际磁场平行的情况下,反射率最大;随着夹角的增大,反射率减小.这些结果为利用电子反射法高精度遥测月表磁场提供了很重要的信息. 展开更多
关键词 电子反射法 遥感探测 磁场异常区 太阳风电子
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