彗星的反常尘埃彗尾-南京大学学报自然科学.PDF

( ) 47 1 Vol. 47, No. 1 JOURNAL OF NANJING U NIVERSITY 2011 1 Jan. 2011 ( NAT URA L SCIENCES) * 1, 3** 1, 2 1, 2 4 胡中为 , 史建春 , 赵海斌 , 林启生 ( 1. , , 21000 ; 2. , , 100012; 3. , , 21000 ; 4. , , , 32001, ) : , . , , , , . , . C/ 2007 N3( Lulin) , 2009 1- 2 , , . : , , , , , , , : P 1 5 1 Anomalous dust tails of comets 1, 3 1, 2 1, 2 4 H u Zhong-Wei , Shi Jian-Chun , Zhao H ai-Bin , L i Qi-Sheng ( 1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, 21000 , China; 2. Nat ional Astronomical Observatory , Chinese Academy of Sciences, Beijing, 100012, China; 3. Astronomy department, Nanjing University, Nanjing, 210093, China; 4. Lulin Observatory, Central University , T aoyuan, 32001, China) Abstract: Comets are spectacular members among the objects of t he solar system, and t heir appearances change wonderfully w hen they orbit the Sun. As they are very far from the Sun, they are basically small naked main bodies the comet nuclei, w hich are ice- conglomerates or dirt y snow balls consisting of ice and dust . As they approach the Sun and are acted by strong solar radiation, ices of the nucleus surfaces are heated and sublimated into gases, and the dust particles embedded in them are freed and dragged out by the gases, they form t he comas huge volume but very th