两个活动区电流暗条的平衡

本文利用Ｋｕｐｅｒｕ—Ｒａａｄｕ模型下电流暗条在垂直方向上的力平衡方程，研究ＭｃＭａｔｈ１０６６２和ＭｃＭａｔｈ１０６０７两个活动区中暗条电流的变化及其垂直运动的规律，探讨暗条和耀斑的关系。结果表明：用具有镜象电流的日珥模型来描述爆发日珥是合适的；暗条长度可能与耀斑高度关系不密切，但电流暗条越长，对应的临界电流值越大。     

两个活动区电流暗条的平衡

本文利用Ｋｕｐｅｒｕ－Ｒａａｄｕ模型下电流暗条在垂直方向上的力平衡方程，研究ＭｃＭａｔｈ１０６６２和ＭｃＭａｔｈ１０６０７两个活动区中暗条电流的变化及其垂直运动的规律，探讨暗条和耀斑的关系。结果表明：用具有镜象电流日珥模型来描述爆发日珥是合适的；暗条长度可能与耀斑高度关系不密切，但电流暗条越长，对应的临界电流值越大。     

光球物质的水平运动对暗条激活和耀斑爆发的影响

本文作者用数值方法讨论光球物质水平运动的两种基本模式－剪切运动和会聚运动对活动区背景磁场及暗条电流的影响，并由此分析它们与暗条激活以及耀斑爆发的物理关系，所得结果表明：（１）光球物质的水平运动在激活暗条和驱动耀斑爆发中具有重要的作用；（２）作为耀斑现象先兆之一的暗条激活过程，主要是由暗条电流的增强和背景磁场的演化所决定，这个过程的复杂性导致了耀斑现象物理机制和形态的多样性。     

导致太阳耀斑爆发的暗条扭绞

本文主要根据Ｈａ线心和不同偏带的观测资料，结合紫外ＣＩＶ１５４８谱线的测量结果，分析研究了１９８０年６月２５日ＡＲ２５２２活动区中一段暗条在耀斑爆发前１５分钟所经历的三次逐渐增强的间歇式扭绞，最终导致暗条破裂和耀斑爆发的物理过程，并且用无力场磁绳近似模拟时间条的扭绞运动，估算了暗条扭绞引直怕无力因子ａ的变化，轴向电流增大和守能，讨论了暗条的稳定性，试图对暗条的瓦解和耀斑爆发予以理论解释。     

太阳的磁绳暗条和一个Ⅲb级耀斑

2000年9月14－18日在紫金山天文台赣榆观测站观测到太阳上有一个中小型活动区，黑子面积不大，但有一个奇特的活动区暗条，16日产生了一个Ⅲb级耀斑，有较强的地球物理效应。计算该区的磁结构，结果发现此磁绳状暗条与磁中性线附近低磁弧系相关，磁场在磁绳附近有强剪切，QSL分析显示三维磁重联能够在暗条附近出现，这可解释大耀斑的形成。     

1993年5月日面AR7500中暗条的动力学特征

本文利用光球磁场、色球Hα单色像和Hβ速度场等观测资料，分析了1993年5月日面AR7500中3个暗条的演化和动力学行为，得出4个结论(1)3个暗条中两个是右旋暗条，一个是左旋暗条。(2)暗条附近两侧的色球纤维和光球横场几乎平行于暗条长轴，暗条端点处的黑子没有呈现明显的涡旋结构。(3)尖角处因为轴向场取向不同，一直没有发生暗条合并，即使其中一个右旋暗条消失后又重新形成也如此。(4)几天持续存在的左旋暗条，在两天的观测中未出现扰动激活，其中部为杂乱而不明显的运动图案。本文还讨论了可以用暗条的扭曲磁流绳模型来解释暗条的这些动力学行为，以及一些尚待进一步澄清的问题。     

AR5572中一个宁静暗条的缠绕运动与磁场的关系

1989年7月8日,在AR5572中,北京天文台怀柔太阳观测站观测到宁静日珥的缠绕运动。磁场观测表明,它与磁对消密切相关。     

视超光速运动与加速模型

用相对论加速喷流模型对48个具有视超光速的射电源进行了分析，结果不但支持流行的喷流模型而且说明加速模型是合理的。     

Particle Acceleration by a Time-Varying Electric Field in Merging Magnetic Fields

Traditional models for particle acceleration by magnetic reconnection in solar flares assumed a constant electric field in a steady reconnecting magnetic field. Although this assumption may be justified during the gradual phase of flares, the situation is different during the impulsive phase. Observed rapid variations in flare emissions imply that reconnection is non-steady and a time-varying electric field is present in a reconnecting current sheet. This paper describes exploratory calculations of charged particle orbits in an oscillating electric field present either at a neutral plane or a neutral line of two-dimensional magnetic field. A simple analytical model makes it possible to explain the effects of particle trapping and resonant acceleration previously noted by Petkaki and MacKinnon in a numerical simulation. As an application, electron acceleration to X-ray generating energies in impulsive solar flares is discussed within the context of the model.     

The Hβ Chromospheric Magnetic Field in a Quiescent Filament

We observed the line-of-sight magnetic field in the chromosphereand photosphere of a large quiescent filament on the solar disk on September 6, 2001 using the Solar Magnetic Field Telescope in Huairou Solar Observing Station. The chromospheric and photospheric magnetograms together with Hβ filtergrams of the filament were examined. The filament was located on the neutral line of the large scale longitudinal magnetic field in the photosphere and the chromosphere. The lateral feet of the filament were found to be related to magnetic structures with opposite polarities. Two small lateral feet are linked to weak parasitic polarity. There is a negative magnetic structure in the photosphere under a break of the filament. At the location corresponding to the filament in the chromospheric magnetograms, the magnetic strength is found to be about 40-70 Gauss (measuring error about 39 Gauss). The magnetic signal indicates the amplitude and orientation of the internal magnetic field in the filament. We discuss several possible causes which may produce such a measured signal. A twisted magnetic configuration inside the filament is suggested .     

Acceleration of Numerical Integration of the Equations of Motion of Asteroids

Solar System Research - Finding and studying possible collisions of asteroids approaching the Earth requires a significant amount of computation. This paper describes the R0 program created to...     

On the Magnetic Field Orientation and Plasma Flows in Solar Filament Barbs

Speeds of vertical flows in quiescent solar filaments are typically much less than the local Alfvén speed. This is why the flows in filament barbs can be modeled by perturbing a magnetostatic solution describing a balance between the Lorentz force, gravity, and gas pressure in a barb. This approach explains why some of the flows are neither aligned with the magnetic field nor controlled by gravity. Both the observed upflows and the magnetic field dips in barbs are likely to be caused by photospheric magnetic reconnection.     

Non-Potentiality of the Magnetic Field Beneath the Eruptive Filament in the Bastille Event

Based on photospheric vector magnetograms obtained at Huairou Solar Observing Station (HSOS), non-potential characteristics of the magnetic field beneath the filament in active region NOAA 9077 are investigated. We focus on the structure and evolution of the magnetic field from 00:08 UT to 10:25 UT of 14 July before the Bastille event. Particular attention is paid to transverse field strength, shear degree and horizontal gradient of the line-of-sight magnetic field around the filament and filament channel. The following characteristics are found. (1) The magnetic non-potentiality has an obviously non-uniform distribution. The shear degree of the transverse field (Hagyard et al., 1984) is very large, up to 75° in some sites beneath the filament, such as the initial brightening site in TRACE 1600 Å images and the breaking site of the filament. The transverse field and the horizontal gradient of the line-of-sight field are very large in some parts corresponding to the hottest and continuously brightening portions. (2) The mean strength and mean shear angle of the transverse field and mean horizontal gradient of the line-of-sight field have obviously dropped in most parts beneath the filament for two hours before the filament eruption and onset of the X5.7/3B flare. After comparing simultaneous UV and EUV images, H filtergrams and Dopplergrams at solar atmosphere, we suggest that magnetic cancellation is likely to quickly transport the magnetic energy and complexity into the higher atmosphere in these two hours. This leads to magnetic instability in the filament and eventually causes the eruption of filament and onset of the flare.     

Stochastic Modeling of the Residual Acceleration Field in a Microgravity Environment

We discuss fluid flows induced by thehigh-frequency components of the residual acceleration field onboard spacecraft (g-jitter) on representative experimental configurations.We study the statistics of g-jitter time series data from theNASA SL-J mission (SAMS-258), and discuss a recently introducedstochastic model of g-jitter. The examples studied are chosen to highlightintrinsically stochastic effects of g-jitter. They include free surfaceresonances, cavity flow, and inertial Brownian motion in suspensions. Thelatter is relevant for coarsening experiments in solid-liquid mixtures.     

行星磁场与卫星引力及其相对运动的统计关系

从知道某些天体具有磁场起，人们就对其磁场的起源提出种种解释，例如有电池说，转子说，化石说，发电机说等等。但由于这些学说都分别与某些观测事实相抵触而未被公认，因此星球磁场的起源一直是未能解决的命题。余先河先生提出，星球的磁场起源可能与所受的引力有关，行星的磁场强度正比于其所受卫星的引力；正比于卫星与行星的引力连线转动的相对角速度。本文对这两方面的命题分别进行了相关分析，得到其相关系数分别为：ｒ＝０．８４８１和ｒ＝０．８４２５，它们都在ａ＝０．０１的信度水平上相关。结果表明余新河关于行星磁场起源的设想是有基础的。本文还对其统计结果和可能机制进行了讨论。