- Modelling the normal magnetic field (TTBT) in the two epochs 2007.0 and 2015.0; the Geomagnetic secular variation (BTTK) and geomagnetic anomaly in Vietnam and adjacent area.
- Quantitative assessment of the magnetic field effect caused by the equatorial current (EEJ); calculation of the EEJ current density;
- Modelling the EEJ according to the longitude, latitude and local time.

Theoretical results:
+ Collected the magnetic field data from CHAMP satellites (from 2002 - 2007), Swarm (A, B, C) (from 2013 - 2017) and from Phu Thuy, Da Lat, Bac Lieu for period 2002-2017.
+ Modelling the normal magnetic field (TTBT) in the two epochs 2007.0 and 2015.0; the Geomagnetic secular variation (BTTK) and geomagnetic anomaly in Vietnam and adjacent area.
+ Calculated the current density of EEJ from the CHAMP satellite data and the ground data for the period 2002-2007.
Applied results:
+ Provide the model of the normal magnetic field in the two epochs 2007.0 and 2015.0; the secular variation and geomagnetic anomaly in Vietnam and adjacent area for scientific research or socio-economic development.
+ Quantitative assessment of some basic parameters of the EEJ current system to be able to consider the effects of this current system on measurements and monitoring of electromagnetic fields in the equatorial area (such as when conducting repeated stations geomagnetic, magnetotelluarics, GPS position ...).
+ The results of the reseach are used in scientific research as well as economic development, serving national security and defense of the country. The results of the topic have been published in prestigious domestic as well as foreign journals will mark the contributions of Vietnamese scientists in the world.

Figure 1a: Map of F (nT) full-field TTBT in Vietnam and surrounding areas, dated 2007.0. (Zoom out from 1:3,000,000 scale map)

Figure 1b: Map of Z (nT) component TTBT in Vietnam and surrounding areas dating back to 2007.0 (Minimized from 1:3,000,000 scale map)

Figure 1c: The map of the magnetic center of the slope I (degrees) of Vietnam and the surrounding area, dating back to 2007.0 (Minimized from the map at 1:3,000,000 scale)

- For the first time in Vietnam, researched and successfully applied the spherical cap harmonic analysis method to calculate the normal magnetic field, secular variation and geomagnetic anomaly for Vietnam and neighboring areas when using geomagtic data obtained on satellites.
- The research  has used a long series of data (up to 6 years), complete and synchronous in time between satellite data and geomagnetic stations data to study the EEJ.
- Develop a method to separate the magnetic field caused by EEJ by polynomials with different order without using fixed order from CHAMP satellite data and study the basic characteristics of EEJ as well as the variations of it globally.

Scientific papers in referred journals (list):

1. Le Truong Thanh, Le Huy Minh et all., A spherical cap model of the geomagnetic field over Southeast Asia from CHAMP and Swarm satellite observations, Journal of Earth System Science, 130, 13(2021), Doi:  https://doi.org/10.1007/s12040-020-01507-9, 2021
2. Le Huy Minh, Le Truong Thanh et all., Contemporary movement of the Earth's crust in the northwestern Vietnam by continuous GPS data, Vietnam Journal of Earth Sciences, 42(4), 334-350, Doi:10.15625/0866-7187/42/4/15282, 2020.

Proposing the Vietnam Academy of Science and Technology and the Institute of Geophysics continue to provide funding for the project team to continue the following studies:
- Research and explain the existence of the extreme peak of EEJ in the longitude through Vietnam.
- Apply the SCHA method to combination of data, as data of geomagnetic stations, data of repeat station, geomagnetic data from air, sea ... to improve the reliability of the normal magnetic field model.
- Continue to study Equatorial Electrojet currents from Swarm satellite data.