共查询到19条相似文献，搜索用时 296 毫秒
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苏梅克-列维9号彗星(SL9)与木星相撞后，在木星上观测到的以常速度(～450m／s)向外扩展的圆环意味着这是碰撞在木星大气中引起的线性波动．我们选取：非旋转、无粘性、密度分层、不可压缩的木星大气模型，而且木星大气以水平速度U=b az运动；给出初始扰动压力P(r；0)作为碰撞的初始条件，用流体力学方程组求解了彗木相撞中的惯性引力波．结果表明：当木星大气以速度U=U0(～170m／s)运动时，彗星碎片的大部分能量都用来产生内波，同时还得到彗星碎片的撞击深度H与水平相速Vp的关系式．当木星大气以速度为U=b az运动时，木星大气的扰动能量不再是在动能和势能间均分。 相似文献
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本文介绍了1994年7月SL－9彗星撞击木星期间3．6cm和12cm射电连续谱观测的结果．在3．6cm波长上，撞击事件无明显的视效应，在12cm波长上，木星的射电平均视流量增加约20％． 相似文献
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吴光节 《中国天文和天体物理学报》1996,(1)
Shoemaker－Levy9号童星于1994年7月与木星碰撞己成为事实．本文依据众多碰撞时刻的观测报道，并结合碰撞预报，对其进行了系统研究．分析了用不同观测技术和观测手段所给出的碰撞时刻的报道，强调了碰撞物理过程的重要性．最后，按照统一的物理模式初步确定了各个碎核的碰撞时刻．并归算出木星南纬碰撞带区的自转速度约为9h55min-周，说明它没有受到营核连续撞击的影响．本文还将各管核撞击点在水面上的位置与预报做了比较． 相似文献
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1994年7月16日─22日，苏梅克－列维9号周期慧星的21颗碎片连续撞击木星事件是一次极为罕见的天文现象．文中概括介绍了我国天文学家对慧木相撞事件的光学和射电观测网点、课题设置以及所取得的主要观测结果． 相似文献
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在SL－9彗星撞击木星期间，用上海天台佘山观测站的1.56m望远镜和CCD照相机，观测木星卫星在接击期间的亮度变化，由此测定了六块碎片的撞击时间。 相似文献
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本介绍了１９９４年７月ＳＬ－９彗星撞击木星期间３．６ｃｍ和１２ｃｍ射电连续谱观测的结果。在３．６ｃｍ波长上，撞击事件无明显的视效应，在１２ｃｍ波长上，木星的射电平均视流量增加约２０％。 相似文献
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天文奇观：彗星联珠撞木星法平今年７月１７日～２２日发生的苏梅克一利维９号（简称ＳＬ９）慧星与木星联珠撞击，吸引了世界天文学界，全球上百座天文台（站）的数以千计的天文学家作了各种观测，取得了丰硕的成果。据各有关报道，ＳＬ９慧星碎裂的２１块慧核接连与木星... 相似文献
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An important feature observed in the wake of the Jupiter-comet clash was the appearance of the ring structure axisymmetrically positioned around the center of the impact. The persistent expansion of the dark rings and its speed indicated an outward propagating gravity wave (Benka, 1995). We employ an analytical model of constant density, uniform finite depth and inviscid fluid layer to investigate the wave motion produced by the impact of Comet Shoemaker-Levy 9 on the Jovian atmosphere. The relevant thermal effects are neglected and an explosion resulting from the collision is then described by an initial impulsive pressure at the surface of the Jovian atmosphere. Under the assumption that all the kinetic energy of a comet fragment is completely converted into the energy of wave motions in the Jovian atmosphere, an analytical formula describing the relationship between the resulting wave motion in the atmosphere and the parameters of a comet fragment (the radius, density and speed) is derived. Results from the present simple analytical model give a qualitative agreement with observations regarding the distance and speed of the waves. 相似文献
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Susan M. P. McKenna-Lawlor 《Solar physics》1995,156(1):191-196
The impact of comet Shoemaker-Levy 9 (SL-9) with Jupiter occurred within a period marking the change over from solar maximum to solar minimum activity in solar cycle 22. In consequence, co-rotating interaction regions, flare-related disturbances, and coronal mass ejections potentially perturbed the Jovian magnetosphere during the period of cometary impact. SOLTIP (Solar Connection with Transient Interplanetary Processes) has called a World Interval, SOLTIP Interval IV, suitably bridging the predicted period of arrival of dust and significant cometary fragments at the planet and, within this time span, 9 May – 9 October, 1994, multi-disciplinary space-based and ground-based solar observations are in process of being formally coordinated, analyzed and made available to observers of the SL-9/Jupiter encounter. In this way, diverse aspects of the circumstances and consequences of the impact of comet Shoemaker-Levy 9 with the Jovian magnetosphere can be interpreted against the background of whatever solar-related interplanetary activity concomitantly occurred. 相似文献
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A report about observations of collision of the comet Shoemaker-Levy 9 with Jupiter is presented. The observations were made both in optical and radio wavelengths. Some consequences of impacts of individual fragments of the comet were detected visually in the 20-cm refractor. 21 days prolonged series of records on a video tape was taken in the focus of the 60-cm reflector, too. 13 serious events from July 16, 1994 to July 23, 1994 on 42.7 MHz radio wavelengths were registered. Its coherence with the pair Shoemaker-Levy 9 and Jupiter in the interaction is the subject of further investigation. More comprehensive results will be published after collecting information about similar observations on radio waves all over the world. 相似文献
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A revised linear model is presented to explain the waves from the collisions of Comet Shoemaker-Levy 9 with Jupiter, in which the Jovian atmosphere is taken as a rotating stratified, compressible and inviscid fluid layer. It is shown that the effect of compressibility can not be ignored, although most of the impacting energy is still converted into the energy of internal waves. 相似文献
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Positional and photometric CCD observations of the comet Shoemaker-Levy 9 fragments were carried out at the Abastumani Astrophysical Observatory. Up to 15 named fragments were detected and their equatorial coordinates and magnitudes are reported. CCD frames were processed using DAOPHOT II. The internal precision of reference star positions down to 18m is 0.″7 and the mean error of photometry does not exceed ±0.3 mag. 相似文献
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Hari Om Vats M. R. Deshpande O. P. N. Calla N. M. Vadher B. M. Darji V. Sukumaran 《Earth, Moon, and Planets》1996,75(2):127-133
In this article we report the peculiar oscillations in the intensity of microwave (4.15 GHz) emission seen during the impact of K fragment of comet Shoemaker-Levy 9 on July 19, 1994. The oscillations begin at 10h 13m 25s UT suddenly with a frequency of ~0.3 Hz and gradually the frequency of these oscillations increases to ~ 1 Hz. The oscillations are not due to local atmosphere or the radio interference from signals of geostationary satellite. They are intrinsic to the microwave emission from Jupiter during the impact of K fragment. Peak-to-peak amplitude of the oscillations is about 34% of the total microwave emission from Jupiter. If we assume that only 50% of the microwave emission is non-thermal and only the non-thermal emission suffered oscillations, then the oscillations are about 68% of the non-thermal emission from Jupiter. The observations also indicate that there are three continuum enhancements during this event and periodic oscillations almost all through. The third enhancement was the largest and during this enhancement there were some additional aperiodic variations. The aperiodic variations were of the order of few minutes and were possibly generated by the gravity waves. The periodic oscillations could be synchrotron emission modulated by the plasma oscillation in the outer magnetosphere. kg]Key words 相似文献
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Hari Om Vats M. R. Deshpansde O. P. N. Calla N. M. Vadher B. M. Darji V. Sukumaran 《Earth, Moon, and Planets》1996,73(2):125-132
This article reports the observations of microwave emission from Jupiter during the impact of K, N, P2 and S fragments of the comet Shoemaker-Levy 9. The comparison of microwave bursts intensities produced by these impacts with the impact class and the size of the impactors reveals no correlation. This is in conformity with other observations at microwave frequencies and indicates that the process of burst emission is very complex. The impacts K and N produced three microwave bursts which could possibly be due to further fragmentation of these fragments. The results are discussed in the perspective of synchrotron emission from Jupiter and possible enhancements due to an increase in the radial diffusion coefficient. However, this model does not fully explain the observations. 相似文献