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Study of Equatorial Ionospheric Irregularities with ROCSAT-1/IPEI Data for Assessment of Impacts of Communication/Navigation System (IV)
Final Rept. 1 Jun 2005-1 Dec 2005
NATIONAL CENTRAL UNIV CHUNG-LI (TAIWAN) INST OF SPACE SCIENCE
Pagination or Media Count:
Two major topics are studied during the first year of the two-year 2005-2007 project. The first one is the comparative study of radiowave scintillation simulations carried out with two different approaches at two different institutions The numerical simulation with the elliptical wave equation carried out by NCU versus the numerical solution of the thin phase-screen model carried out by AFRLVSBXI. Although AFRLVSBXI has sent us detailed density irregularity profile at every 50 km downward from 600 km altitude where the density structure is taken from ROCSAT-1 measurement, we were unable to make good comparison with our numerical solutions at various designated altitudes because the AFRL simulated density profile does not contain the horizontal structure to have a proportional value to the measured density structure at 600 km but has a known PSD in density fluctuation with random phase. This makes comparison difficult. However, we have tuned our numerical simulation model to have an excellent agreement with the AFRL results and with single-phase or multi-phase screen results of N. Rogers from UK. Detailed comparison will be continued during the second half of the project years. The second major accomplishment is to have a detailed analysis of the statistical distribution of the midlatitude density irregularities together with case study of midlatitude irregularity characteristics and causes. The result of the case study has been written into a paper ready for submission to publish in Journal of Geophysical Research in Space Physics in July, 2006
APPROVED FOR PUBLIC RELEASE