H2O+ ions in the plasma tail of comet Ikeya-Zhang

Astronomy and Astrophysics – Astronomy

Scientific paper

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Comets, Plasma Tails, Water

Scientific paper

We present observations of comet Ikeya-Zhang, obtained on May 4, 2002 with the Focal Reducer Rozhen (FoReRo), attached to the 2-m telescope of the National Astronomical Observatory, Rozhen, Bulgaria. A narrow-band interference filter was used to isolate the emission line of H2O+ at 6158.86 Å. Several structures have been identified in the plasma tail of this comet. The gradual tailward displacement of these structures has been used to determine the velocity of the ions in the plasma tail of comet Ikeya-Zhang. The derived velocity has been used to estimate the water production rate of comet Ikeya-Zhang by using the similarity laws of magnetohydrodynamics.

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