The D-region ion composition |
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| Authors: | Narinder Nath C S G K Setty |
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| Institution: | (1) Ionosphere Research Centre, Department of Physics and Astrophysics, University of Delhi, 110007 Delhi, India |
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| Abstract: | In this paper it is attempted to evaluate the relative importance of Lyman  , EUV, solar X-rays and the secondary cosmic rays in producing ionization in the D-region below 90 km. The resulting ionization is studied in reference to its variations with the solar zenith angle and the solar activity. The currently available absorption and ionization cross-sections and the radiation fluxes have been used. The computed production rates and the currently accepted positive and negative ion reaction schemes are used to compute the positive and negative ion composition. The resulting electron density profiles are compared with the rocket and the theoretical profiles obtained by other workers. The agreement with the rocket results (Mechtly and Smith) appears to be satisfactory whereas the theoretical profiles given by others differ considerably below 70 and 80 km respectively for the solar minimum and maximum conditions. |
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