Induced proton flow in a collapsing post-sunset ionosphere and protonosphere |
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| Authors: | JA Murphy RJ Moffett |
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| Institution: | Department of Mathematics, University of Aston in Birmingham, Gosta Green, Birmingham B4 7ET, England;Department of Applied Mathematics and Computing Science, University of Sheffield, Sheffield, S10 2TN, England |
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| Abstract: | The effect of the onset of post-sunset conditions on thermal proton flow is examined for mid-latitudes by numerical solution of the equations of continuity, momentum and energy balance for H+ and O+. Results are calculated for a dipole magnetic field tube situated at L = 4 and acceleration terms are included in the momentum equations. Proton flow into the ionosphere results from decay of the F2-layer. Changes in temperatures and temperature gradients following sunset may not enhance the H+ flow. Under extreme conditions the H+ flow remains subsonic. It seems unlikely that an interhemispheric flux of protons can directly maintain the nighttime F2-layer. |
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