• Study of the application of space technologies (GPS, LIDAR…) for atmospheric observations.
• Estimation of the influence of the atmosphere and the ionosphere to the propagation of satelitte signal in Vietnam.

Scientific results

• Database continuous GPS data, ionospheric vertical soundings; algorithms and programs for the calculation of ionospheric total electron content (TEC), ionospheric delay, ionospheric scintillation, using Gamit software for calculation of tropospheric integrated water vapour (IWV) from GPS data. Study of the spacio-temporal variations of the atmospheric and ionospheric parameters.
• Data base of lidar, Sun photometer and others for atmospheric research. Methods, algorithms and programs for lidar simulation, lidar, Sun photometer and others  data processing… Report on atmospheric data analysis with the main results of aerosol optical properties over Vietnam.

Applied results

• Calculations of TEC, ionospheric delay, ionospheric scintillation, tropospheric integrated water vapour for the 2006-2010 GPS data of the Hanoi, Hue and Ho Chi Minh city GPS  stations.
• The obtained temporal-latitudinal TEC maps show that Vietnam lays under the equatorial ionization anomaly (EIA), the northern part under its crest, the southern part under its trough. The monthly mean amplitute of the crest varies with the season (maximum in equinox and minimum in winter and in summer), and with the solar activity. The ionospheric scintillations appear usually in the nightime, their occurrence frequency varies with the season and the solar activity. The mean diurnal variation of the IWV in each GPS stations has an individual behaviour and seems to correlate with the mean diurnal variation of the atmospheric pressure. The monthly mean IWV varies with the season, maximum in summer, minimum in winter, but maximum in Hanoi clearer than in HCM City and in Hue. Time variation of the critical fequency f₀F₂ at each station is sililar to the one of the GPS TEC.
• Initial estimations of atmospheric influence on satellite products. These results can be used for weather forecast application, climate and environmental research.

• Continuous GPS data and lidar data is a new source of data in Vietnam.
• Algorithms, programs obtained in the project permit to master the applications of the GPS, LIDAR… technologies for ionospheric and atmospheric observations.
• Time series of the ionospheric and atmospheric parameters obtained in the project could be used to study the ionospheric and atmospheric environments and their correlations with other physical phenomena.

Scientific papers in referred journals (list)

1. Le Huy Minh et al., Preliminary results of the estimation of the zenith total delay and the integrated water vapour of troposphere by GPS in Vietnam, J. of Sciences of the Earth, 31(3), 201-211, 2009.
2. Tran Thi Lan, Le Huy Minh et al., A preliminary study of the total electron content and ionospheric scintillation using GPS continuous data in Vietnam, J. of Sciences of the Earth, 31(3), 212-223, 2009.
3. Alfonsi L., L. Spogli, J. R. Tong, G. De Francheschi, A. Bourdillon, M. Le Huy and C. N. Mitchell. GPS scintillation and TEC gradient at equatorial latitudes on April 2006, Advances in Space Research, JASR 10161, 2010.
4. Le Huy Minh et al., Global positioning system anf its application for the Earth Sciences, Proceedings of the Scientific Conference on the 35th anniversary of the VAST, 65-79, 2010.
5. Le Huy Minh et al., Crustal motion from the continuous GPS data in Vietnam and in the Southeast Asian region, J. of Sciences of the Earth 32(3), 249-260, 2010.
6. Tran Thi Lan, et al., Temporal variations of the total electron content and ionospheric scintillation from the continuous GPS data in Vietnam , J. Sciences Earth, 4(32), 2011.
7. Nguyen Xuan Anh, Le Nhu Quan, Lidar system and its application for cirrus cloud study. Proceedings of the Scientific Conference on the 50th anniversary of the Geophysics in Vietnam, 330-338, 2008.
8. Nguyen Xuan Anh, Le Viet Huy, Aerosol research using Bac Giang and Bac Lieu data. Proceedings of the Scientific Conference on the 50th anniversary of the Geophysics in Vietnam, 307,-320, 2008.
9. Lutsenko V. I., Lutsenko I. V., Nguyen Xuân Anh,  Using radio Doppler effect for cloud turbulence  study, Izvetia Vuzov Radioelectonika,  T53, N1, 1-11, 2010.
10. Gugkov V.N., Lutsenko V. I., Lutsenko I. V., Nguyen Xuan Anh. Using Global Navigation Systems for diagnostics of above land troposphere refraction, Izvetia Vuzov Radioelectonika, T53,N7, 3-12, 2010.

• Technological products

1. Full report of the research
2. Programs for calculation of  the total electron content, ionospheric delay, ionospheric scintillation…; programs for simulation of lidar system, lidar data processing…

Integrated water vapour and other atmospheric parameters obtained by these technologies could be used for the meteorological prediction and for the ionospheric and atmospheric environments.