Time Constants in the Ionosphere from Neural Network Models

Martin Friedrich, Martin Fankhauser

Research output: Contribution to journalArticlepeer-review

Abstract

Neural network (NN) models for the low latitude and the polar ionosphere from the D- to the F-region were developed which are based on incoherent scatter radar data from Arecibo and EISCAT Svalbard, respectively. The various geophysical input parameters defining the NN are not only the ones that represent the time one wants to predict, but also the geophysical conditions prior to the time of the prediction. The optimum length of these preceding periods are derived for the two models are different, but a period of 60 days is a compromise acceptable for both latitudes. Furthermore from the Arecibo data time constants of electron density decay after sundown are derived which – arguably – are also relevant elsewhere, including the polar latitudes. Whereas at all altitudes the electron densities decay exponentially after sundown, below 300 km there is an additional variation with solar zenith angle.
Original languageEnglish
Pages (from-to)691-695
JournalAdvances in Space Research
Volume51
Issue number4
DOIs
Publication statusPublished - 2013

Fields of Expertise

  • Sonstiges

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