Nonlinear shock structure in a weakly ionised magnetoplasma
The formation of a neutral induced weak nonlinear shock structure in a weakly ionised magnetoplasma has been analytically investigated. Using the reductive perturbation method, basic dynamical equations of a three-component (electron, ion and neutral) plasma have been reduced to a well-known Bur...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
1994-12-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/12/1139/1994/angeo-12-1139-1994.pdf |
| Summary: | The formation of a neutral induced weak
nonlinear shock structure in a weakly ionised magnetoplasma has been
analytically investigated. Using the reductive perturbation method, basic
dynamical equations of a three-component (electron, ion and neutral) plasma have
been reduced to a well-known Burger equation which can support a weak shock
solution. Its stationary and initial value solutions have been derived to
describe the characteristics of the weak shock profile. Asymptotic behaviour of
the Burger solution results in a saw-tooth structure which has a practical
implication to predict the nonlinear steepened structure of the nighttime
irregularity in the lower portion of the Earth's ionosphere. Accordingly, it is
suggested that the observation of saw-tooth shape of nighttime irregularity at
92 km could be attributed to the nonlinear saturation of the NILF mode
instability as proposed by Dwivedi and Das in 1992. However, exact experimental
verification of this suggestion requires more data on nighttime irregularity in
the mesosphere and lower thermosphere (80-95 km) for a wide range of scale sizes
extending up to about 1 km and above. |
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| ISSN: | 0992-7689 1432-0576 |