Long-period HM waves associated with cometary O(+) (or H2O(+)) ions: Sakigake observations

Details Long-period HM waves associated with cometary O(+) (or H2O(+)) ions: Sakigake observations Long-period HM waves associated with cometary O(+) (or H2O(+)) ions: Sakigake observations

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.249y&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 249-253 (SEE N87

Physics

1

Halley'S Comet, Hydrogen Ions, Long Wave Radiation, Oxygen Ions, Plasma Waves, Water, Ion Cyclotron Radiation, Japanese Spacecraft, Magnetohydrodynamic Flow, Space Plasmas

Scientific paper

Long-period HM waves near the local "water group" ion cyclotron frequency were detected at the closest approach of Sakigake to comet Halley. These transverse waves having ≡2 nT peak-to-peak amplitude (δB) propagated approximately parallel to the ambient field. The necessary cometary pickup-ion density for excitation of the waves at 7×106km upstream from the comet can be inferred to be on the order of 10-3cm-3 for 5 - 50 keV "water group" ions. Ring and shell formation, and "thermalization" times of newly created pickup-ion distributions are ≡150 s, 100 s, and 4000 s, respectively, for δB/B0 ≡ 0.25 at 7 - 9×106km. These low-frequency HM waves are concluded to be excited by a resonant beam instability.

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