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Dissertation summary: Study of the equatorial electrojet (eej) from champ satellite and observatories data in Vietnam and adjacent areas

Research objectives: Collect and process the magnetic data from CHAMP satellite and from the magnetic observatories within 6 years (from 2002-2007); study the method to separate magnetic field caused by EEJ from the observed data; identify some parameters of EEJ in all over meridians and study the variation of EEJ in space and time. The variation of EEJ in longitude, latitude and local time. | MINISTRY OF EDUCATION VIETNAM ACADEMY OF AND TRAINING SCIENCE AND TECHNOLOGY GRADUATE UNIVERSITY OF SCIENCE AND TECHNOLOGY LE TRUONG THANH STUDY OF THE EQUATORIAL ELECTROJET EEJ FROM CHAMP SaTeLLITE and observatories DATA IN VIETNAM AND ADJACENT AREAS SPECIALTY GEOPHYSICS CODE 62 44 01 11 ABSTRACT OF DOCTORATE DISSERTATION HANOI - 2015 The dissertation completed at Graduate University of Science and Technology Vietnam Academy of Science and Technology. Academic Supervisors Asc. Prof. Dr. Ha Duyen Chau Dr. Le Huy Minh Reviewer 1 Prof. Dr. Sc. Mai Thanh Tan Reviewer 2 Asc.Prof. Dr. Dinh Van Toan Reviewer 3 Dr. Hoang Van Vuong This thesis is going to be defended at the council of doctorate thesis examiners of Graduate University at . on.Date. . 2015. The dissertation could be found at 1. National Library Hanoi. 2. Library of Vietnam Academy of Science and Technology. 3. Library of Graduate University of Science and Technology. 1 INTRODUCTION 1. Necessity of the thesis The magnetic field caused by Equatorial Electrojet EEJ only occupies a small part of the geomagnetic field recorded at Earth surface or at satellite orbit but its daily variation can be up to hundreds nT in equatorial zone as in Vietnam and affects strongly to the geomagnetic field measurements. Previously studies of EEJ mainly used the geomagnetic field data recorded at the observatories. Today dozens of satellites measuring geomagnetic field gave us a lot of data to study EEJ on a global scale but using such satellite data have not been fulfilled in Vietnam. Recently in the paper of Doumouya et al. 2004 the authors used the geomagnetic data from CHAMP satellite in two months August and September 2001 to study EEJ in global scale and noticed that at longitude through Vietnam 1050E the amplitude of EEJ magnetic field has the maximum value. However this study used too few data only two months in many areas there is no data and in this period of strong solar activity the separation of the magnetic field .