摘要： A coincident observation that occurred on 24 March 2000 between the irregularity structure measured by ROCSAT‐1 and the scintillation experiment at the Ascension Island has been studied. The study of scintillation statistics is carried out first, and the results show that the Nakagami distribution can portray the normalized intensity of the L‐band scintillation at various S4 values, up to S4 equal to 1.4. Moreover, the departure of frequency dependence on S4 predicted by the weak scintillation is noticed due to multiple forward scattering effects. The coincident feature between the characteristics of irregularity structure and the scintillation variation are then studied. The causal relationship between the fluctuation of ion density and the scintillation variation is obtained. A numerical simulation using the parabolic wave equation has been carried out with the ROCSAT‐1 data in space to compare with the ground scintillation observation. The results show the reasonable scintillation level at the coincident time to indicate a direct relationship between the irregularity structure and the scintillation in both temporal and amplitudinal variations. Finally, some assumptions and limitations of the simulation model are discussed. Key Points Observation of ROCSAT high‐resolution data in density irregularities Strong scintillation event at Ascension Island Study of coincident scintillation event with data in space and on the ground 其他題名： Radio Sci 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2012-10 出處： Radio science, 2012-10, Vol.47 (5), p.n/a 資源來源： Wiley Online Library - AutoHoldings Journals 版權： 2012. American Geophysical Union. All Rights Reserved. 版權： Copyright American Geophysical Union 2012 識別號： ISSN: 0048-6604 識別號： ISSN: 1944-799X 識別號： EISSN: 1944-799X 識別號： DOI: 10.1029/2011RS004908
