Abstract
We estimate proton and alpha particle bulk parameters within the cometosheath. We observed that the density of proton was almost constant (~ 200 cm-3) except near the bow shock and that of alpha particle was almost constant (~ 7 cm-3) in the cometosheath. Temperature of protons seems to decrease from bow shock to about 2 105 km, and increase thereafter slightly, but that of alpha particle seems to be almost constant. This decrease is likely caused by the cooling effect accompanying with the charge exchange process as well as with the mass addition of cold pickup ions. On the contrary, the observed temperature of alpha particles stayed almost constant throughout the cometosheath. This is because that there is no effective cooling process for alpha particles within the cometosheath.
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