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A Disconnection Event of Comet Lulin
SHI Jian-chun ; LIN Chi-sheng ; HU Zhong-wei ; ZHAO Hai-bin
Source PublicationChinese Astronomy and Astrophysics
AbstractThe cometary disconnection event (DE) is the separation of theentire cometary tail or a part of it from the cometary head. It is one of the mostspectacular phenomena of comets. The driving mechanism remains unclear,and at present there are many competitive theories to explain the onset of DE.However, the variable solar wind is suspected to play a major role. Comet Lulinexhibited a DE on 4th Feb. 2009. The data around this date are analyzed, andit is found that the comet Lulin had already endured a DE on 3rd Feb. 2009. Bycomparing the morphologies of the plasma tails in these two DEs, it is concludedthat the DE which occurred on 3rd Feb. 2009 is another DE, which is distinctfrom that of 4th Feb. 2009. In this paper, we describe the results of analysison the DE dated 3rd Feb. 2009. The measured velocity of disconnection motionis about 68 km/s, and the calculated onset time of this DE is 3.635±0.215 Feb.2009 in UT decimal date. Combining the orbital characteristics of Comet Lulinbefore and after the DE occurrence and the solar-wind data measured by theSTEREO-A spacecraft, it is concluded that the DE which occurred on 3rd Feb.009 was probably caused by the magnetic reconnection due to the nteractionbetween the comet and a coronal mass ejection (CME).
KeywordComets: Individual Lulin—methods Data Analysis
Subject AreaAstronomy & Astrophysics
Document Type期刊论文
Recommended Citation
GB/T 7714
SHI Jian-chun,LIN Chi-sheng,HU Zhong-wei,et al. A Disconnection Event of Comet Lulin[J]. Chinese Astronomy and Astrophysics,2011,35:295-303.
APA SHI Jian-chun,LIN Chi-sheng,HU Zhong-wei,&ZHAO Hai-bin.(2011).A Disconnection Event of Comet Lulin.Chinese Astronomy and Astrophysics,35,295-303.
MLA SHI Jian-chun,et al."A Disconnection Event of Comet Lulin".Chinese Astronomy and Astrophysics 35(2011):295-303.
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