Comet Halley | Published:

Interaction between comet Halley and the interplanetary magnetic field observed by Sakigake

Nature volume 321, pages 303307 (15 May 1986) | Download Citation

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Abstract

During 10–12 March 1986, the magnetometer carried by the Japanese spacecraft Sakigake detected clear multiple crossings of the nearly horizontal heliospheric neutral sheet. As there was no apparent disconnection event (DE) in comet Halley's ion tail during 11–14 March, an interplanetary magnetic field (IMF)–comet interaction model with a quasi-parallel neutral sheet is proposed to explain why a DE did not occur. Enhancements of hydromagnetic (HM) waves were observed near the time of closest approach to comet Halley. Neutral particles of cometary origin are proposed to yield, at 7 × 106 km upstream of the comet, the ionized O+ (or H2O+) particles which excite the HM waves.

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Author information

Affiliations

  1. Onagawa Magnetic Observatory and Geophysical Institute, Tohoku University, Sendai 980, Japan

    • Takao Saito
    • , Kiyohumi Yumoto
    •  & Tomoko Nakagawa
  2. Department of Aeronautics and Astronautics, Tokai University, Hiratsuka, Kanagawa 259-12, Japan

    • Kunio Hirao
  3. Nozawa 4-20-2, Setagaya-ku, Tokyo 154, Japan

    • Keiji Saito

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https://doi.org/10.1038/321303a0

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