Morphological analysis of the plasma structures of comet P\Halley

Voelzke, Marcos Rincon; Matsuura, O. T.

doi:10.1016/s0032-0633(97)00204-3

Cited by 11 publications

(25 citation statements)

References 19 publications

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“…These results agree with the earlier research from Voelzke and Matsuura (1998), which analysed comet 1P/Halley´s tail structures in its last apparition in 1986. The opportunity to extensively investigate a bright comet at two consecutive appearances using the wealth of observational information gathered in 1910 and comparing it with the material obtained in 1986, allows a better analysis of cometary evolution, besides being so far a rare opportunity.…”

Section: Discussionsupporting

confidence: 93%

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Analysis of the Tail Structures of Comet 1p/Halley 1910 Ii

Voelzke

2013

RevistaUnivap

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Section: Discussionsupporting

confidence: 93%

“…The goals of this research are to report the results obtained from the analysis of the 1P/Halley´s 1910 II images, to provide empirical data for comparison with an earlier study of comet 1P/Halley in MATSUURA, 1998) and to form the input for future physical/theoretical work.…”

Section: Discussionmentioning

confidence: 99%

Analysis of the Tail Structures of Comet 1p/Halley 1910 Ii

Voelzke

2013

RevistaUnivap

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“…A subset of images (531 out of 1439) from The International Halley Watch Atlas of Large-Scale Phenomena (Brandt et al 1992a), covering the period from 1985 September 17 to 1986 July 06, were selected on the basis of their many conspicuous morphological structures along the cometary tail. They were visually and systematically analysed for the purpose of identification and classification (Voelzke & Matsuura 1998).…”

Section: Introductionmentioning

confidence: 99%

“…The cyclic nature of this phenomenon, called a disconnection event (DE), was noted long ago (Barnard 1899(Barnard , 1920. Disconnection events (Niedner & Brandt 1979;Jockers 1985;Celnik et al 1988;Delva et al 1991;Brandt et al 1992b;Voelzke & Matsuura 1998) are common. They occur over wide ranges in heliocentric distance, heliospheric latitude, and phases of the solar cycle.…”

Section: Introductionmentioning

confidence: 99%

“…This work presents the kinematic analysis for two onsets of DEs (1985 December 13.5 and 1986 February 22.2). The DE onset time, when the comet supposedly crossed a magnetic sector boundary, is determined assuming that the disconnected plasma moves away from the nucleus at constant velocity (Voelzke & Matsuura 1998). This is compared with the analysis of (Yi et al 1994b) which determined the time of disconnection assuming constantly accelerated linear motion.…”

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The onsets of disconnection events of comet P/Halley on 1985 December 13-14 and 1986 February 22

Voelzke

Matsuura

2000

Astron. Astrophys. Suppl. Ser.

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Abstract. This work compares cometary and solar wind data with the purpose of determining the solar wind conditions associated with comet plasma tail disconnection events (DEs). The cometary data are from The International Halley Watch Atlas of Large-Scale Phenomena (Brandt et al. 1992a). A systematic visual analysis of the atlas images (Voelzke & Matsuura 1998) revealed, among other morphological structures, 47 DEs. The solar wind data are in situ measurements from IMP-8, ICE and PVO, which are used to construct the variation of solar wind speed, density and dynamic pressure during the analysed interval. Data from these same spacecraft plus Vega 1 were used to determine the times of current sheet crossings. These data were fitted to heliospheric current sheet curves (Hoeksema 1989) extrapolated from the corona into the heliosphere in order to determine the best-fit coronal source-surface radius for each Carrington rotation. This work presents the kinematic analysis for two onsets of DEs (1985 December 13.5 and 1986 February 22.2). The DE onset time, when the comet supposedly crossed a magnetic sector boundary, is determined assuming that the disconnected plasma moves away from the nucleus at constant velocity (Voelzke & Matsuura 1998). This is compared with the analysis of (Yi et al. 1994b) which determined the time of disconnection assuming constantly accelerated linear motion. The velocity varies broadly from one DE to another. In this paper, we report the results of an analysis of four DEs observed from 13 through 14 December 1985 and on 22 February 1986. From a kinematic analysis of the widefield photographic images we calculated the disconnection time of the 1985 December 13-14 DEs to be December 13.5 and of the 1986 February 22 to be February 22.2, which are in good agreement with Yi et al. (1994b). The solar wind conditions around comet P/Halley, inferred by corotation of IMP-8 data to the comet, were such Send offprint requests to: M.R. Voelzke, e-mail: mvoelzke@astro.uni-bonn.de that comet P/Halley had just crossed the interplanetary magnetic field (IMF) sector boundary; the solar wind density was, respectively, 15 cm −3 and 7 cm −3 ; the solar wind speed was, respectively, 370 km s −1 and 500 km s −1 . We conclude that our results corroborate the idea that DEs are associated with sector boundary crossings and that the magnetic reconnection plays an important role in the formation of DEs and can be considered as the triggering mechanism (Niedner & Brandt 1978;Brandt et al. 1999).

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