Coupling between the F-region and protonosphere: Numerical solution of the time-dependent equations |
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Authors: | RJ Moffett JA Murphy |
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Institution: | Department of Applied Mathematics and Computing Science, University of Sheffield, Sheffield S10 2TN, England |
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Abstract: | This paper describes a new method of solution of the time-dependent continuity and momentum equations for H+ and O+ in mid-latitude magnetic field tubes from the F-region to the equator. For each ion the equations are expressed as an integro-differential equation. This equation is treated as an ordinary differential equation and solved by a searching method. By means of this method, the distribution of H+ in the O+?H+ transition region and the protonosphere can be investigated and the influence of H+ fluxes on the F layer examined.As an example of application of the method a suggestion by Park (1971) about observed night-time enhancements of NmF2 is examined. He suggested that lowering of the F layer some hours after a magnetic substorm may cause NmF2 to increase because of increased ion influx from the protonosphere. In the present calculations the Flayer is maintained around a constant height for some time and then abruptly lowered. Under the conditions adopted the resulting increase in downward H+ flux is sufficient to maintain NmF2 against the increased recombination but not to increase NmF2 significantly. It is emphasised that these results are not conclusive. |
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