[P-EM27] Physics and Chemistry in the Atmosphere and Ionosphere

[PEM27-P14] Improvement of an estimation method of the electron density profile in the lower ionosphere with time domain Full wave

*Taketoshi MIYAKE¹, Hiroaki MORIYAMA¹, Yuki ASHIHARA², Yasuhiro MURAYAMA³, Seiji KAWAMURA³ (1.Toyama Prefectural University, 2.Nara National College of Technology, 3.National Institute of Information and Communications Technology)

Keywords:Ionospheric D region, MF Radar, Full-wave method, DAE method

We are going to simulate the observation process of the present MF radar system
with the time domain Full wave method,
and investigate the observation method with which
we can obtain the precise electron density profile in the lower ionosphere.
One of the general methods to estimate the electron density in the present MF radar system
is the differential absorption experiment (DAE) method.
The DAE method is a technique to estimate the electron density from
the differential amount between the left and the right polarized waves
reflected from the lower ionosphere.
We simulated the MF radar with time domain Full wave analysis and examined the DAE method.
We improved the DAE method by using appropriate parameters automatically,
and succeeded to estimate more accurate electron density profiles in the lower ionosphere.
In the present improved DAE method, however,
we can only find appropriate parameters in the case that
the electron density increases with increase of the altitude.
Therefore, we are going to improve the DAE method, which is available in any case.