Comet P/Giacobini-Zinner electron and H2O(+) column densities from ICE and ground-based observations

Details Comet P/Giacobini-Zinner electron and H2O(+) column densities from ICE and ground-based observations Comet P/Giacobini-Zinner electron and H2O(+) column densities from ICE and ground-based observations

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..474m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, Feb. 1987, p. 474-478.

Astronomy and Astrophysics

Astronomy

6

Electron Density Profiles, Emission Spectra, Giacobini-Zinner Comet, Plasma Layers, Water, Comet Nuclei, Ground Stations, Ice

Scientific paper

The authors compare an H2O+ spatial mission profile, extracted from an optical CCD spectrogram obtained during the ICE/Giacobini-Zinner encounter, to the electron-density profile that was deduced from in situ measurements by the radio experiment aboard ICE. The electron column density along a line of sight has two components, one from the spherically symmetric coma, and the second from a thin plasma sheet, whenever it is along the line of sight. The deduced electron column-density profile agrees well with the observed H2O+ emission profile. The authors conclude that the electrons and the H2O+ ions are distributed similarly 9600 km tailward from the cometary nucleus, that the ratio of number densities of H2O+ ions to electrons is about 1/4 at this point, and that the width of the plasma sheet is about 16000 km.

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