Hydromagnetic Waves Associated with Cometary Water Group Ions - Sakigake Observations

Details Hydromagnetic Waves Associated with Cometary Water Group Ions - Sakigake Observations Hydromagnetic Waves Associated with Cometary Water Group Ions - Sakigake Observations

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..117y&link_type=abstract

Astronomy and Astrophysics, Vol. 187, NO. 1&2/NOV(I), P. 117, 1987

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Long-period hydromagnetic waves near the local "water group" ion cyclotron frequency were detected at the closest approach of Sakigake to comet P/Halley. These transverse waves having ˜2nT peak-to-peak amplitude propagated approximately parallel to the ambient field. The necessary cometary pickup-ion density of "water group" ions for excitation of these waves at 7×106km upstream from the comet can be inferred to be of the order of 10-3cm-3.

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