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A possible mechanism for producing cosmic gamma ray bursts 产生宇宙伽马射线暴的可能机制
Chinese Astronomy
Pub Date : 1980-03-01 DOI: 10.1016/0146-6364(80)90063-8
Zhang He-qi

In this paper, we propose a model to explain the energy supply of cosmic γ-ray bursts by means of magnetic energy annihilation in neutral sheets formed in local active regions on magnetic white dwarfs. According to this model the instability process in the plasma consists of two phases, a thermal explosive phase and a steady annihilation phase. The magnetic energy stored in the local source is efficiently converted into kinetic energy and the energy dissipation is at a rate consistent with the observations. With the rapid increase of anomalous resistivity a plasma turbulence field is set up which can immediately be coupled with fast electrons in the Maxwellian high energy tail. The relativistic electrons are then produced within a time as short as 10−8 sec., which is not in conflict with the fast ascent of brief “spikes” of gamma rays. The calculated results indicate that the γ-rays can also be emitted through synchrotron radiation by the accelerated electrons moving around the magnetic field.

While many details of this theoretical model remain to be cleared up, the present point of view may be taken as a promising basis for future work.

在本文中，我们提出了一个模型来解释宇宙γ射线爆发的能量供应，通过磁能湮灭在磁白矮星的局部活动区域形成的中性片。根据该模型，等离子体中的不稳定过程包括两个阶段，即热爆炸阶段和稳定湮灭阶段。存储在局域源中的磁能有效地转化为动能，能量耗散速率与观测值一致。随着异常电阻率的迅速增加，在麦克斯韦高能尾中建立了一个等离子体湍流场，该湍流场可以立即与快电子耦合。相对论性电子在10−8秒的时间内产生，这与伽马射线的短暂“尖峰”的快速上升并不冲突。计算结果表明，在磁场中加速运动的电子也可以通过同步辐射发射γ射线。虽然这个理论模型的许多细节仍有待澄清，但目前的观点可能被视为未来工作的一个有希望的基础。
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引用次数: 1
An algorithm for finding the extreme values of a function of many variables and its application in the automatic design of astronomical optical systems 求多变量函数极值的算法及其在天文光学系统自动设计中的应用
Chinese Astronomy
Pub Date : 1980-03-01 DOI: 10.1016/0146-6364(80)90064-X
Su Ding-qian, Wang Ya-nan, Zhou Bi-fang, Lu Sheng-dong

It is shown that if the equipotentials are n-dimensional ellipsoids, then the streamlines will converge to the centre of the ellipsoids representing minimum potential, and in doing so, the streamlines will get closer and closer to the longest axist of the ellipsoids.

Based on the above consideration, an algorithm is presented for finding the minimum point of the function φ = Σfi2. At each iteration, we take the linear expansions of fi and proceed along the streamlines corresponding to the resulting, approximate φ, of which the equipotentials are ellipsoids. When we are close to the longest axis of the ellipsoids, we take a suitable leap along the line joining the current point to the centre of the ellipsoid, to begin the next iteration. This method has been found effective in the automatic design of astronomical optical systems. Three examples are given.

结果表明，当等势为n维椭球时，流线会向代表最小势的椭球中心收敛，并且流线会越来越靠近椭球的最长存在线。基于以上考虑，提出了一种求函数φ = Σfi2的最小值点的算法。在每次迭代中，我们对fi进行线性展开，并沿着与结果近似φ对应的流线进行，其中等势为椭球体。当我们接近椭球体的最长轴时，我们沿着连接当前点到椭球体中心的线进行适当的跳跃，开始下一次迭代。该方法在天文光学系统的自动设计中得到了很好的应用。给出了三个例子。
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引用次数: 0
Motion of the pole in the years 1949 – 1976 1949 - 1976年的磁极运动
Chinese Astronomy
Pub Date : 1980-03-01 DOI: 10.1016/0146-6364(80)90055-9
Polar Motion Collaboration Group

Based on data of latitude observations from 41 stations and observatories, the secular and periodic components of the polar motion were separately derived. A system of coordinates of the pole, with origin at the mean pole of 1968.0, called JYD, was set up and the coordinates for the year 1949.0 – 1976.0 are given.

利用41个台站的纬度观测资料，分别推导了极地运动的长期分量和周期分量。建立了以1968.0年平均极为原点的极坐标系JYD，并给出了1949.0 ~ 1976.0年的极坐标。
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引用次数: 0
Magnitude-redshift relation of QSO's with strong interplanetary scintillation 强行星际闪烁QSO的星等红移关系
Chinese Astronomy
Pub Date : 1980-03-01 DOI: 10.1016/0146-6364(80)90067-5
Qu Qin-yue, Qin Zhi-hai, Han Chuan-shou, Zhou Feng-an
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引用次数: 7
On the additional perturbations in the theory of motion of artificial satellites 人造卫星运动理论中的附加摄动
Chinese Astronomy
Pub Date : 1979-12-01 DOI: 10.1016/0146-6364(79)90031-8
Wu Lian-da
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引用次数: 0
Accelerated rotation of the sunspots of September 1977 and the spiral structure in their penumbrae 1977年9月太阳黑子的加速旋转及其半影中的螺旋结构
Chinese Astronomy
Pub Date : 1979-12-01 DOI: 10.1016/0146-6364(79)90030-6
Zhang Bo-rong, Zhong Shu-hua, Wang Hong-zhao
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引用次数: 1
The astrolabe catalogue (ACPI) of the Peking astronomical observatory 北京天文台星盘目录
Chinese Astronomy
Pub Date : 1979-12-01 DOI: 10.1016/0146-6364(79)90026-4
Luo Ding-jiang, Zhu Yuan-xian, Xiao Nai-yuan, Miao Yong-kuan, Lin Zhao-fen

Using the results of our latitude and time programs obtained with the impersonal astrolabe (OPL No. 30) of the Peking Observatory, we have calculated the corrections to individual star positions and the systematic corrections Δαδ and Δδδ to catalogue positions.

利用北京天文台的非个人化星盘(OPL No. 30)得到的纬度和时间程序的结果，我们计算了对单个恒星位置的修正和对目录位置的系统修正Δαδ和Δδδ。
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引用次数: 0
Statistical analyses of quasars with resolved radio components. III. Evolutionary properties of the sizes of components. IV. Evolutionary properties of radio polarization parameters 具有分辨射电成分的类星体的统计分析。3组件尺寸的演化特性。四、无线电极化参数的演化特性
Chinese Astronomy
Pub Date : 1979-12-01 DOI: 10.1016/0146-6364(79)90028-8
Zhou You-yuan, Fang Li-zhi, Cheng Fu-hua, C. Fu-zhen
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引用次数: 0
The astrolabe catalogue (ACPI) of the Peking astronomical observatory 北京天文台星盘目录
Chinese Astronomy
Pub Date : 1979-12-01 DOI: 10.1016/0146-6364(79)90026-4
Luo Ding-jiang, Zhu Yuan-xian, Xiao Nai-yuan, Miao Yong-kuan, Lin Zhao-fen
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引用次数: 0
A method of finding the longitude and latitude of a ground station using simultaneous photographic observations of satellites 利用卫星的同时摄影观测来确定地面站的经度和纬度的方法
Chinese Astronomy
Pub Date : 1979-12-01 DOI: 10.1016/0146-6364(79)90024-0
Kun-yi Huang, Xiong Zhou
{"title":"A method of finding the longitude and latitude of a ground station using simultaneous photographic observations of satellites","authors":"Kun-yi Huang, Xiong Zhou","doi":"10.1016/0146-6364(79)90024-0","DOIUrl":"https://doi.org/10.1016/0146-6364(79)90024-0","url":null,"abstract":"","PeriodicalId":100241,"journal":{"name":"Chinese Astronomy","volume":"9 1","pages":"323-331"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89021512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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