Computer Science
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996adspr..18..295m&link_type=abstract
Advances in Space Research, Volume 18, Issue 6, p. 295-301.
Computer Science
Scientific paper
Several new interests relating to mesospheric ionization have emerged : one of these concerns the possible change in D region ionisation profiles (and in composition) from the coolig of the mesosphere resulting from increases in greenhouse gases. Given such interest, there is a case for a new look at the ATM approach (Adjusted Theoretical Model) on the lines introduced by Rowe et al. in 1974 /1/. In this, profiles were constructed of electron density, positive ion density and positive and negative ion composition on the basis of a composite approach in which a number of constraints were defined in terms of the then existing experimental data which the models had to satisfy. This ATM approach is used to redefine the constraints using a number of rocket D region profiles collected from Thumba over the last three decades. These resulted in changes in the key parameters that enter into the six-ion theoretical model. Comparisons are also shown between the observed D region profiles and the IRI profiles for similar conditions : IRI electron density values are found to be systematically larger than Thumba Rocket values.
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