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We report the electron density in a plasma tail of Comet ISON (C/2012 S1)derived from interplanetary scintillation (IPS) observations during November1--28, 2013. Comet ISON showed a well-developed plasma tail (longer than 2.98 x10^{7} km) before its perihelion passage on November 28. We identified a radiosource whose line-of-sight approached the ISON's plasma tail in the aboveperiod and obtained its IPS data using the Solar Wind Imaging Facility at 327MHz. We used the Heliospheric Imager onboard the Solar-Terrestrial RelationObservatory to distinguish between the cometary tail and solar eruption originsof their enhanced scintillation. From our examinations, we confirmed three IPSenhancements of a radio source 1148-00 on November 13, 16, and 17, which couldbe attributed to the disturbance in the cometary tail. Power spectra of 1148-00had the steeper slope than normal ones during its occultation by the plasmatail. We estimated the electron density in the ISON's plasma tail and found 84cm^{-3} around the tail axis at a distance of 3.74 x 10^{7} km from thecometary nucleus and an unexpected variation of the electron density in thevicinity of the tail boundary.

Plasma distribution of Comet ISON (C/2012 S1) observed using the radio scintillation method