Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa41a1407a&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA41A-1407
Physics
2400 Ionosphere (6929), 2499 General Or Miscellaneous, 6934 Ionospheric Propagation (0689, 2487, 3285, 4275, 4455), 6964 Radio Wave Propagation, 6969 Remote Sensing
Scientific paper
MF radar estimates the electron density in lower ionospheric D and E regions at the altitude from 60km to 100km by using the partial reflection information of MF radar transmission wave. Though, the electron density in ionospheric D region is very small, about 10-1000 /cc, electrons are closely related to neutral dynamic meteorology and chemistry including such as hydrated ion and NOx in the region. Therefore, it has the possibility to find a new physical knowledge in mesosphere and lower ionosphere. MF Rader transmits the burst pulse radio wave toward vertically direction. This pulse has 48μsec. width and modulated by 1.995MHz. Differential Absorption Experiment (DAE) is one of the methods to estimate the electron density by MF radar. DAE needs three information, which are ratio of received intensity, reflection coefficient and attenuate coefficient. Ratio of received intensity is found by the differential amount of between the left and the right polarized wave reflected by ionosphere. Though, reflection and attenuation coefficient are given as constant which is only depended on altitude, and is not depended on electron or atmospheric density. The validity of DAE has not been examined for more than 30 years. So we examine the validity of treatment both refection and attenuation coefficient as constant. Full wave analysis is a simulation method to calculate the radio wave propagation characteristics in ionosphere. Though, MF radar transmitted pulse must be treated in the time-domain. In this study, we obtain the time development of MF radar transmitted pulse by applying Fourier transformation to Full wave analysis on simulation. It is required some parameters, electron density profile, neutral-electron collision frequency profile, etc., to execute Full wave analysis. This time development data of MF radar transmitted pulse includes the reflection pulse, i.e. ratio of received intensity, at the ionosphere. We can calculate electron density profile by DAE method used this ratio of received intensity. We compare the electron density profiles, used by Full wave analysis and calculated by DAE method.
Ashihara Y.
Ishisaka K.
Kawamura Seiji
Miyake Takashi
Murayama Yuko
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