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
Onagawa Magnetic Observatory and Geophysical Institute, Tohoku University, Sendai, 980, Japan
- Takao Saito
- , Kiyohumi Yumoto
- & Tomoko Nakagawa
Department of Aeronautics and Astronautics, Tokai University, Hiratsuka, Kanagawa, 259-12, Japan
- Kunio Hirao
Nozawa 4-20-2, Setagaya-ku, Tokyo, 154, Japan
- Keiji Saito
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