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Reconstruction of nonmonotonic height profiles of electron density from vertical sounding ionograms by the regularization method
Author(s) -
Beloff N.,
Denisenko P. F.,
Gough M. P.
Publication year - 2002
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2000rs002390
Subject(s) - regularization (linguistics) , depth sounding , standard deviation , daytime , electron density , mathematics , electron , computational physics , geodesy , mathematical analysis , geology , physics , computer science , statistics , atmospheric sciences , oceanography , quantum mechanics , artificial intelligence
The problem of reconstruction of daytime nonmonotonic height profiles of electron density N ( h ) from ionograms of ground‐based vertical sounding is considered. The regularization (REG) scheme has been proposed for determination of valley parameters. A comparison of the least squares method (LSM) with the regularization (REG) scheme was carried out using computer simulations. It is shown that LSM results are very sensitive to random errors in virtual heights. This fact leads to an unpredictably large deviation of the reconstructed N ( h ) profile from the real one. The application of REG methods makes the results more stable to random errors in measurements and allows us to decrease the deviation of the restored real height and valley depth from their model values by several times in comparison with LSM results.