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Integration of Poisson's equation for a disk galaxy of finite thickness 有限厚度盘状星系泊松方程的积分
Chinese Astronomy Pub Date : 1979-12-01 DOI: 10.1016/0146-6364(79)90027-6
Peng Qiu-he, Huang Ke-lian, Huang Jie-hao, Li Xiao-qing, Su Hong-jun
{"title":"Integration of Poisson's equation for a disk galaxy of finite thickness","authors":"Peng Qiu-he,&nbsp;Huang Ke-lian,&nbsp;Huang Jie-hao,&nbsp;Li Xiao-qing,&nbsp;Su Hong-jun","doi":"10.1016/0146-6364(79)90027-6","DOIUrl":"https://doi.org/10.1016/0146-6364(79)90027-6","url":null,"abstract":"<div><p>Assuming a density perturbance in the form of an Archimedes spiral and an exponential decrease of matter density along the z-direction, Poisson's equation governing the perturbed gravitational field is solved with Hankel's integral transform and the method of steepest descent. For shortwave perturbances in the plane z=0, a simple analytical expression is given. In our approximation, the form of the perturbed field is determinate and is also an Archimedes spiral.</p></div>","PeriodicalId":100241,"journal":{"name":"Chinese Astronomy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0146-6364(79)90027-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91763389","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: 1
On the use of seares' formulae in the determination of the direction of magnetic fields in sunspots 西雷斯公式在确定太阳黑子磁场方向中的应用
Chinese Astronomy Pub Date : 1979-12-01 DOI: 10.1016/0146-6364(79)90029-X
Ye Shi-hui, Wang Zhen-yi, Jin Jie-hai
{"title":"On the use of seares' formulae in the determination of the direction of magnetic fields in sunspots","authors":"Ye Shi-hui,&nbsp;Wang Zhen-yi,&nbsp;Jin Jie-hai","doi":"10.1016/0146-6364(79)90029-X","DOIUrl":"https://doi.org/10.1016/0146-6364(79)90029-X","url":null,"abstract":"<div><p>In this paper our numerical solution of the transfer equations of the Stokes parameters in the presence of magnetic fields is used to calculate the intensity ratios of the components of Zeeman triplets and their relations with the intensity and direction of magnetic fields. From this we have shown that the application of Seares' formulae to the determination of the direction of the magnetic fields in sunspots may give rise to very large errors. A suggestion for the improvement of this method is made.</p></div>","PeriodicalId":100241,"journal":{"name":"Chinese Astronomy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0146-6364(79)90029-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91763385","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: 1
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, Cheng Fu-zhen
{"title":"Statistical analyses of quasars with resolved radio components. III. Evolutionary properties of the sizes of components. IV. Evolutionary properties of radio polarization parameters","authors":"Zhou You-yuan,&nbsp;Fang Li-zhi,&nbsp;Cheng Fu-hua,&nbsp;Cheng Fu-zhen","doi":"10.1016/0146-6364(79)90028-8","DOIUrl":"https://doi.org/10.1016/0146-6364(79)90028-8","url":null,"abstract":"<div><p>The sizes of 64 radio components of quasars have been determined using their angular diameters and redshifts. No significant correlation is found between their sizes and their mutual separation whether different initial luminosity ranges are considered separately or together. This result implies that the sizes of the components do not change much during the lifetime of quasars with a resolved radio structure.</p><p>A statistical analysis has been made on the polarization properties of those quasars in which the Faraday depolarization is mainly responsible for the inverse relationship between the degree of polarization and the wavelengrh. Our results are: (1) There is no significant correlation between <span><math><mtext>λ</mtext><msub><mi></mi><mn><mtext>1</mtext><mtext>2</mtext></mn></msub></math></span> and <em>D</em>; there is, however, an obvious correlation between <span><math><mtext>λ</mtext><msub><mi></mi><mn><mtext>1</mtext><mtext>2</mtext></mn></msub><msup><mi></mi><mn>2</mn></msup><mtext> d</mtext><msup><mi></mi><mn>∗</mn></msup></math></span> and <span><math><mtext>D</mtext><msup><mi></mi><mn>∗</mn></msup></math></span>. (2) The statistical relation between <em>m</em><sub>max</sub> and <em>D</em> shows that the random component of the magnetic field increases as the quasar evolves. (3) There is no evident evolutionary trend in the magnetic field given by minimizing the total energy. (4) The representation by a Gaussian of the Faraday depth distribution makes it obvious that the thermal electron density in the components decreases as the quasar evolves: <span><math><mtext>n</mtext><msub><mi></mi><mn>e</mn></msub><mtext> = 2.24 × 10</mtext><msup><mi></mi><mn>−2</mn></msup><mtext> × 10</mtext><msup><mi></mi><mn>−0.071</mn></msup><mtext>D</mtext><msup><mi></mi><mn>∗</mn></msup></math></span></p></div>","PeriodicalId":100241,"journal":{"name":"Chinese Astronomy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0146-6364(79)90028-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91763388","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
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
Huang Kun-yi, Zhou Xiong
{"title":"A method of finding the longitude and latitude of a ground station using simultaneous photographic observations of satellites","authors":"Huang Kun-yi,&nbsp;Zhou Xiong","doi":"10.1016/0146-6364(79)90024-0","DOIUrl":"https://doi.org/10.1016/0146-6364(79)90024-0","url":null,"abstract":"<div><p>As it is difficult to determine accurately the station height from simultaneous observations of satellites, we propose to use the λ-component of the chord direction in the station-station coordinate system to find the longitude and latitude of the unknown station, the computation being weighted in favour of this component. Results show that this method is better than the usual methods of intersecting chord directions and of intersecting synchronous planes. A method of data control and external accuracy analysis is also set out.</p></div>","PeriodicalId":100241,"journal":{"name":"Chinese Astronomy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0146-6364(79)90024-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91763391","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
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 Borong, Z. Shu-hua, Wang Hong-zhao
{"title":"Accelerated rotation of the sunspots of September 1977 and the spiral structure in their penumbrae","authors":"Zhang Borong, Z. Shu-hua, Wang Hong-zhao","doi":"10.1016/0146-6364(79)90030-6","DOIUrl":"https://doi.org/10.1016/0146-6364(79)90030-6","url":null,"abstract":"","PeriodicalId":100241,"journal":{"name":"Chinese Astronomy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77820546","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: 1
On the use of seares' formulae in the determination of the direction of magnetic fields in sunspots 西雷斯公式在确定太阳黑子磁场方向中的应用
Chinese Astronomy Pub Date : 1979-12-01 DOI: 10.1016/0146-6364(79)90029-X
Ye Shi-hui, Wang Zhen-yi, Jin Jie-hai
{"title":"On the use of seares' formulae in the determination of the direction of magnetic fields in sunspots","authors":"Ye Shi-hui, Wang Zhen-yi, Jin Jie-hai","doi":"10.1016/0146-6364(79)90029-X","DOIUrl":"https://doi.org/10.1016/0146-6364(79)90029-X","url":null,"abstract":"","PeriodicalId":100241,"journal":{"name":"Chinese Astronomy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79584541","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: 1
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
{"title":"On the additional perturbations in the theory of motion of artificial satellites","authors":"Wu Lian-da","doi":"10.1016/0146-6364(79)90031-8","DOIUrl":"https://doi.org/10.1016/0146-6364(79)90031-8","url":null,"abstract":"<div><p>The question of the additional perturbations due to the motion of the coordinate system in the theory of artificial satellites is discussed in some detail. Basic ideas are clarified and an error in Lambeck's 1973 paper is pointed out. It is demonstrated again that the most suitable coordinate system to use in the theory of motion of artificial satellites is the orbital system, and not the <span><math><mtext>mean</mtext></math></span> orbital system.</p></div>","PeriodicalId":100241,"journal":{"name":"Chinese Astronomy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0146-6364(79)90031-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91763383","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
Subject and author index 主题和作者索引
Chinese Astronomy Pub Date : 1979-12-01 DOI: 10.1016/0146-6364(79)90033-1
{"title":"Subject and author index","authors":"","doi":"10.1016/0146-6364(79)90033-1","DOIUrl":"https://doi.org/10.1016/0146-6364(79)90033-1","url":null,"abstract":"","PeriodicalId":100241,"journal":{"name":"Chinese Astronomy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0146-6364(79)90033-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137260839","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
Integration of Poisson's equation for a disk galaxy of finite thickness 有限厚度盘状星系泊松方程的积分
Chinese Astronomy Pub Date : 1979-12-01 DOI: 10.1016/0146-6364(79)90027-6
P. Qiu-he, Huang Ke-lian, Huang Jie-hao, Li Xiao-qing, Su Hong-jun
{"title":"Integration of Poisson's equation for a disk galaxy of finite thickness","authors":"P. Qiu-he, Huang Ke-lian, Huang Jie-hao, Li Xiao-qing, Su Hong-jun","doi":"10.1016/0146-6364(79)90027-6","DOIUrl":"https://doi.org/10.1016/0146-6364(79)90027-6","url":null,"abstract":"","PeriodicalId":100241,"journal":{"name":"Chinese Astronomy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75584717","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: 1
Corrections to star positions from observations with a Danjon Astrolabe during 1965–1972 1965-1972年丹戎星盘观测对恒星位置的修正
Chinese Astronomy Pub Date : 1979-12-01 DOI: 10.1016/0146-6364(79)90025-2
{"title":"Corrections to star positions from observations with a Danjon Astrolabe during 1965–1972","authors":"","doi":"10.1016/0146-6364(79)90025-2","DOIUrl":"https://doi.org/10.1016/0146-6364(79)90025-2","url":null,"abstract":"","PeriodicalId":100241,"journal":{"name":"Chinese Astronomy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0146-6364(79)90025-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137261290","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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