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当代外语研究 2004年第2期 6-8页

作者： Patricia Reaney 汤裕珍

一般认为:彗星包含一个镶嵌在星云状圆盘里,小而明亮的彗核,圆盘叫慧发。1949年,美国天文学家佛瑞德·L·惠普尔提出彗核实际上包容着彗星的全部质量,是一个冰、尘集成的"脏雪球"。 "雪球"理论的主要证据依赖于不同的数据资料。其一,

关键词：天文学家惠普尔 “雪球”理论 comet 运行周期

Explosion of comet Shoemaker-Levy 9 Impacting on Jupiter

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Chinese Physics Letters 1998年第10期15卷 772-774页

作者： MA Yue-hua XU Pin-xin Purple Mountain Observatory Chinese Academy of SciencesNanjing 210008

The fragments of comet Shoemaker-Levy 9 entering the Jovian atmosphere suffered ablation and dissociation as a result of interaction with the atmosphere,and then exploded in the twinkle of an eye.A typical comet fragment is modeled as 1013 kg with a density of 1.0g/cm^(3).Our results show that the fragment exploded below the ammonia cloud layer,near the 1-bar level,which can explain why there was ammonia but no water in the *** simple explosion model shows that the explosion could uplift the atmosphere to 5000km above the Jovian atmosphere,as observed,with the area covered by the ejecta to Jupiter's center making an angle of about 10°.

关键词： Jupiter comet uplift

The broad-band CCD photometry and dust production rates of comet Hale-Bopp

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Science China Mathematics 2000年第1期43卷 98-103页

作者：黄克谅胡景耀周洪楠 Department of Physics Nanjing Normal University Nanjing 210097 China Beijing Observatory Chinese Academy of Sciences Beijing 100080 China

Based upon broad-band CCD observation data of comet Hale-Bopp obtained by a 60 cm telescope at Xinglong Station of Beijing Astronomical Observatory during March-August, 1996, the photometric results of comet Hale-Bopp are reported. Using the photometric results, the dust production rate, radius and mass of nucleus of comet Hale-Bopp are estimated as follows: dM/dt × 1.5 × 105 kgs?1, Rn × 35.5 km, and Mn × 5.65 × 1016 kg.

关键词： comet Hale-Bopp CCD photometry dust production rate.

Influence of Solar Photogravitation on the Motion of comet Hale-Bopp

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Chinese Physics Letters 1998年第6期15卷 466-468页

作者： ZHENG Xue-tang ZHU Wen-yao YU Li-zhong Department of Applied Physics Nanjing University of Science and TechnologyNanjing 210094 Shanghai Observatory Chinese Academy of SciencesShanghai 200030

On the basis of photogravitational theory,the influence of solar photogravitation on the motion of comet Hale-Bopp is *** is shown that for plasma tail of comet Hale-Bopp there is only one collinear point L_(3) and for a few of dust tail there can be two coplanar points L_(6),L_(7) and three collinear points L_(21),L_(22),L_(3).The regions in which the coplanar points exist and the dust grain of comet Hale-Bopp can move are also obtained.

关键词： comet Hale Bopp

Influence of Mass-Loss on the Orbit of comet Shoemaker-Levy 9

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Chinese Physics Letters 1996年第6期13卷 477-480页

作者： YU Li-zhong ZHENG Xue-tang Department of Applied Physics Nanjing University of Science and TechnologyNanjing 210094

Using the Jeans problem and the Fermi problem of two bodies with variable masses,the influence of solar and cometary mass-loss on the orbit of comet Shoemaker-Levy 9(SL9)is discussed in this *** is shown that solar and cometary mass-loss both will cause the secular and periodic terms in the semimajor axis a of comet *** influence of solar mass-loss on the orbit of comet SL9 is very small and it may be *** the influence of mass-loss of comet SL9 itself on its orbit is large and it may cause the secular variation in a to be about l04 km every *** cometary mass-loss will obviously influence the time and place of the comet SL9 crashing into Jupiter.

关键词： comet Jupiter mass

Search for Majoron at the comet experiment

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Chinese Physics C 2023年第1期47卷 93-100页

作者：邢天宇吴琛妙晗李海波李卫国袁野张瑶 Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China Research Center for Nuclear Physics Osaka UniversityIbarakiOsaka 567-0047Japan

A new Goldstone particle named Majoron is introduced in order to explain the origin of neutrino mass via some new physics models assuming that neutrinos are Majorana *** expanding the signal region and using likelihood analysis,it becomes possible to search for Majoron using experiments originally designed to search forμ-e *** the comet experiment,the sensitivity of processμ→eJ is able to reach B(μ→eJ)=2.3×10-5in Phase-I and O(10-8)in ***,the sensitivities to search for Majoron in future experiments are also discussed in this article.

关键词： Majoron neutrino comet new physics

Fragments of comet Hyakutake (C/1996 B2)

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Chinese Science Bulletin 1998年第2期43卷 153-155页

作者： Daohan Chen Aidi Zhao Qindi Wu Yi Song Yixin Fan Shousheng Sun Yan Zhang Linan Sun Acad Sinica Purple Mt Observ Nanjing 210008 Peoples R China Purple Mt Observ Qingdao Stn Qingdao 266003 Peoples R China

Several fragments of comet Hyakutake were observed in March and April of 1996. This leads to the impression that the splitting of comet Hyakutake on a small scale occurred frequently. Data analysis points to a rotatio... 详细信息

关键词： comet Hyakutake fragment rotation period.

The splitting of comet Halley

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Science China Mathematics 1995年第3期38卷 342-354页

作者：陈道汉刘麟仲 Alan Gilmore Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China Mount John Observatory New Zealand

In combination with the authors’ previous observation about the splitting of comet Halley in March 1986, the events involving the sharp, straight feature in the antisolar direction observed in the bead of comet Halley in 1910 (such as those occurring on May 14, 25 and 31, and June 2) are rediscussed. The analysis leads to the following scenario: When comet Halley explodes and splits, a fragment jettisoned or thrown off from the nucleus will, after moving in the direction of its tail, develop into a mini-comet. Although not well developed or permanent, it has its own plasma tail and, sometimes, a dust tail. If Bobrovnikoff’s definition of a secondary nucleus is assumed, then the fragment should be considered as a real secondary nucleus. It seems that the current idea of a tailward jet suggested by Sekanina and Larson is a wrong explanation for the plasma tail of a mini-comet and hence the rotation period of 52- 53 h for comet Halley is doubtful.

关键词： comet Halley explosion splitting.

Time of impact of fragment P2 of comet SL 9 on Jupiter

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Chinese Science Bulletin 1997年第5期42卷 396-398页

作者： ZHOU Hongnan,QIAN Bochen, HUANG Keliang and LI Qibin1. Department of Astronomy, Nanjing University, Nanjing 210093, China 2. Shanghai Observatory, Chinese Academy of Sciences, Shanghai 200030, China 3. Physics Department, Nanjing Normal University, Nanjing 210097, China 4. Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100080, China Department of Astronomy Nanjing University Nanjing China Shanghai Observatory Chinese Academy of Sciences Shanghai China Physics Department Nanjing Normal University Nanjing China Beijing Astronomical Observatory Chinese Academy of Sciences Behijing China

FROM 1994-07-16 to 1994-07-22, 21 fragments of comet SL 9 impacted against Jupiter in succession. During the impact period the impact of fragments D, E, K, N, P2 and S was observed in China. We used a 1.56-m telescope with the CCD camera of Shanghai Observatory to monitor Jupiter and its Galilean Satellites, obtaining 1000 high-quality images at B, V, I wave bands. Our data on optical wave bands are rather complete and valuable in the world. Specially, we got some images of Jupiter, Io and Europa in the impact time of fragment P2 impacting against Jupiter. This will help us understand the precise time, position, depth and energy of the P2’s collision. In this note, we report the impact time of fragment P2 of comet SL 9 and Jupiter. Since the impact of comet SL 9 was expected to take place on the side of Jupiter

关键词： comet comet Shoemaker-Levy 9 impacting against Jupiter impact time.

DISTURBANCE STRUCTURES AND THEIR MAGNETIC FIELD FEATURES IN PLASMA comet TAIL

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Science China Mathematics 1990年第4期33卷 446-453页

作者：李中元 Department of Earth and Space Science University of Science and Technology of China Hefei 230026 PRC

The solar wind disturbances result in the emergence of condensation structures in plasma comet tails. Most of them are correlated with plasma vortex flows. The features of condensations are analysed. Based on the theories of magnetic hydrodynamics and forcefree fields, the construction and the distribution of magnetic field and its energy in condensations are specifically discussed. Details on the coupling process between an unsteady plasma motion and a magnetic field are given. The coupling effect makes the energy in comet tails change into a force-free field in condensation, so that the magnetic field energy in the condensation continuously increases. Many phenomena observed in comet tails can be explained with the idea.

关键词： comet physics magnetic field of type-1 comet tail space plasma physics disturbances on the solar wind and interplanetary.