Ion tail disturbance of comet C/Hyakutake 1996B2 observed around the closest approach to the Earth

Daisuke Kinoshita; Hideo Fukushima; Jun Ichi Watanabe; Naotaka Yamamoto

doi:10.1093/pasj/48.5.L83

Ion tail disturbance of comet C/Hyakutake 1996B2 observed around the closest approach to the Earth

Daisuke Kinoshita, Hideo Fukushima, Jun Ichi Watanabe, Naotaka Yamamoto

Graduate Institute of Astronomy

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Abstract

A sequential imaging observation of the ion tail of Comet C/Hyakutake 1996B2 was carried out on 1996 March 25 with a wide-field CCD imaging camera developed at the National Astronomical Observatory of Japan. We detected a peculiar knot receding along the main axis of the ion tail during our observation. This knot was located at 5.0 × 10⁶ km from the nucleus on March 25.6 UT, and moved about 2.0 × 10⁶ km during 5 hr. The measured velocity along the axis of the ion tail was derived to be 99.2±0.3 km s^-1, which is alomost constant within the observational limit. We also measured the perpendicular motion of this knot to the axis, and identified rapid acceleration. The brightness of the knot decreased during the observation. We report on preliminary results of an analysis of this phenomenon, and discuss some characteristics in this paper.

Original language	English
Pages (from-to)	L83-L86
Journal	Publications of the Astronomical Society of Japan
Volume	48
Issue number	5
DOIs	https://doi.org/10.1093/pasj/48.5.L83
State	Published - 1996

Keywords

Comets: Individual (comet C/Hyakutake 1996B2)
Interplanetary medium
Magnetic field
Plasmas

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10.1093/pasj/48.5.L83

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title = "Ion tail disturbance of comet C/Hyakutake 1996B2 observed around the closest approach to the Earth",

abstract = "A sequential imaging observation of the ion tail of Comet C/Hyakutake 1996B2 was carried out on 1996 March 25 with a wide-field CCD imaging camera developed at the National Astronomical Observatory of Japan. We detected a peculiar knot receding along the main axis of the ion tail during our observation. This knot was located at 5.0 × 106 km from the nucleus on March 25.6 UT, and moved about 2.0 × 106 km during 5 hr. The measured velocity along the axis of the ion tail was derived to be 99.2±0.3 km s-1, which is alomost constant within the observational limit. We also measured the perpendicular motion of this knot to the axis, and identified rapid acceleration. The brightness of the knot decreased during the observation. We report on preliminary results of an analysis of this phenomenon, and discuss some characteristics in this paper.",

keywords = "Comets: Individual (comet C/Hyakutake 1996B2), Interplanetary medium, Magnetic field, Plasmas",

author = "Daisuke Kinoshita and Hideo Fukushima and Watanabe, {Jun Ichi} and Naotaka Yamamoto",

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T1 - Ion tail disturbance of comet C/Hyakutake 1996B2 observed around the closest approach to the Earth

AU - Kinoshita, Daisuke

AU - Fukushima, Hideo

AU - Watanabe, Jun Ichi

AU - Yamamoto, Naotaka

PY - 1996

Y1 - 1996

N2 - A sequential imaging observation of the ion tail of Comet C/Hyakutake 1996B2 was carried out on 1996 March 25 with a wide-field CCD imaging camera developed at the National Astronomical Observatory of Japan. We detected a peculiar knot receding along the main axis of the ion tail during our observation. This knot was located at 5.0 × 106 km from the nucleus on March 25.6 UT, and moved about 2.0 × 106 km during 5 hr. The measured velocity along the axis of the ion tail was derived to be 99.2±0.3 km s-1, which is alomost constant within the observational limit. We also measured the perpendicular motion of this knot to the axis, and identified rapid acceleration. The brightness of the knot decreased during the observation. We report on preliminary results of an analysis of this phenomenon, and discuss some characteristics in this paper.

AB - A sequential imaging observation of the ion tail of Comet C/Hyakutake 1996B2 was carried out on 1996 March 25 with a wide-field CCD imaging camera developed at the National Astronomical Observatory of Japan. We detected a peculiar knot receding along the main axis of the ion tail during our observation. This knot was located at 5.0 × 106 km from the nucleus on March 25.6 UT, and moved about 2.0 × 106 km during 5 hr. The measured velocity along the axis of the ion tail was derived to be 99.2±0.3 km s-1, which is alomost constant within the observational limit. We also measured the perpendicular motion of this knot to the axis, and identified rapid acceleration. The brightness of the knot decreased during the observation. We report on preliminary results of an analysis of this phenomenon, and discuss some characteristics in this paper.

KW - Comets: Individual (comet C/Hyakutake 1996B2)

KW - Interplanetary medium

KW - Magnetic field

KW - Plasmas

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JO - Publications of the Astronomical Society of Japan

JF - Publications of the Astronomical Society of Japan

IS - 5

ER -

Ion tail disturbance of comet C/Hyakutake 1996B2 observed around the closest approach to the Earth

Abstract

Keywords

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