Inverting ionospheric D-region electron density pro-file from riometer measurement
Tegegne, Malefia (2015)
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe201504227337
https://urn.fi/URN:NBN:fi-fe201504227337
Tiivistelmä
The aim of this work is to invert the ionospheric electron density profile from Riometer
(Relative Ionospheric opacity meter) measurement. The newly Riometer instrument
KAIRA (Kilpisjärvi Atmospheric Imaging Receiver Array) is used to measure
the cosmic HF radio noise absorption that taking place in the D-region ionosphere
between 50 to 90 km. In order to invert the electron density profile synthetic data is
used to feed the unknown parameter Neq using spline height method, which works
by taking electron density profile at different altitude. Moreover, smoothing prior
method also used to sample from the posterior distribution by truncating the prior
covariance matrix. The smoothing profile approach makes the problem easier to find
the posterior using MCMC (Markov Chain Monte Carlo) method.
(Relative Ionospheric opacity meter) measurement. The newly Riometer instrument
KAIRA (Kilpisjärvi Atmospheric Imaging Receiver Array) is used to measure
the cosmic HF radio noise absorption that taking place in the D-region ionosphere
between 50 to 90 km. In order to invert the electron density profile synthetic data is
used to feed the unknown parameter Neq using spline height method, which works
by taking electron density profile at different altitude. Moreover, smoothing prior
method also used to sample from the posterior distribution by truncating the prior
covariance matrix. The smoothing profile approach makes the problem easier to find
the posterior using MCMC (Markov Chain Monte Carlo) method.