Ion Tail Disturbance of Comet C/Hyakutake 1996B2 Observed around the Closest Approach to the Earth

Publications of the Astronomical Society of Japan

Fukushima, Hideo²  Kinoshita, Daisuke¹  Yamamoto, Naotaka³  Watanabe, Jun-ichi² 

[1] Department of Physics, Faculty of Science, Tohoku University, Aoba-ku, Sendai, Miyagi 980-77 E-mail:;National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181;Department of Physics, Science University of Tokyo, 1-3 Kagurazaka, Shinjyuku-ku, Tokyo 162

关键词: "Comets: individual (Comet C/Hyakutake 1996B2)";    "Interplanetary medium";    "Magnetic field";    Plasmas;   

DOI  :  10.1093/pasj/48.5.L83

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

AsequentialimagingobservationoftheiontailofCometC/Hyakutake1996B2wascarriedouton1996March25withawide-fieldCCDimagingcameradevelopedattheNationalAstronomicalObservatoryofJapan.Wedetectedapeculiarknotrecedingalongthemainaxisoftheiontailduringourobservation.Thisknotwaslocatedat5.0×106kmfromthenucleusonMarch25.6UT,andmovedabout2.0×106kmduring5hr.Themeasuredvelocityalongtheaxisoftheiontailwasderivedtobe99.2±0.3kms−1,whichisalmostconstantwithintheobservationallimit.Wealsomeasuredtheperpendicularmotionofthisknottotheaxis,andidentifiedrapidacceleration.Thebrightnessoftheknotdecreasedduringtheobservation.Wereportonpreliminaryresultsofananalysisofthisphenomenon,anddiscusssomecharacteristicsinthispaper.

【 授权许可】

Unknown