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Helium ions in the mid-latitude plasmasphere |
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| Authors: | JA Murphy GJ Bailey RJ Moffett |
| Institution: | aDepartment of Mathematics, University of Aston, Gosta Green, Birmingham B4 7ET, England bDepartment of Applied Mathematics and Computing Science, University of Sheffield, Sheffield S10 2TN, England |
| Abstract: | An initial study of the behaviour of He+ ions in the mid-latitude plasmasphere is carried out by solving the time-dependent equations of continuity and momentum. Starting with a low He+ tube content, results are obtained for a period of 8 days. In the topside ionosphere there is an upflow of He+ during the day and downflow at night, for the sunspot maximum conditions considered. The downflow at night differs from the behaviour of H+ for these atmospheric conditions. However, little of the He+ produced in the daytime is lost by recombination at night; it is suggested that the supply of He+ to the mid-latitude plasmasphere is, in effect, an escape process for neutral helium. |
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