I'm specialized on geomagnetism and have been working on varieties of subjects under this topic: - Main geomagnetic field studies (in particular, westward drift of the non-dipole field) - External geomagnetic field studies (Magnetic effects of solar eclipses on the ionosphere, Solar and Lunar geomagnetic variations) - Electromagnetic induction in the Earth (applications of magnetotelluric method on active/passive faults, volcanoes, geothermal areas and ocean bottom EM studies).