is dominant. The cross-section for (38) is unknown, but again for sufficiently high energy [[spi:math]]. The Ar+ + H2 charge-exchange crosssection has been measured by Gilbody and Hasted (1956). Note that the chargeexchange lifetimes (~ 100 hrs) are comparable to the average duration between magnetospheric storms which typically defines the lifetimes of the natural magnetospheric plasma. Thus, we expect that the injection Ar+ plasma will substantially modify the magnetosphere with a time constant roughly equal to several days until a new magentospheric storm sweeps out the accumulation, if the storm mechanism remains effective under the modified circumstances. Some aspects of these longer term effects of ion cloud distribution are summarized by Garrett and Forbes (1979). 32
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