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Title of paper Variations of the induction vector, worldwide study
List of authors Rokityansky I.I.
Affiliation(s) Subbotin Institute of Geophysics of the National Academy of Sciences of Ukraine, Kiev, Ukraine
Summary Real (in phase) and imaginary (out of phase) induction vectors (vertical response functions) were obtained for every day in the time interval from 1991 to 2014 years on 137 observatories of the global network «Intermagnet» for 5 intervals of periods: 150-300 c, 300-600 c, 600-1200 c, 1200-2400 c, 2400-3600 c. To reduce scatter and make it easier to work with great amount of data, the daily values were averaged to monthly mean values. Such global material from +870 to -880 geomagnetic latitudes was obtained for the first time and its analysis yields new scientific results. The annual variation with a period 1 year is visible at about 2/3 of the observatories (At the rest observatories it is below background of shorter period variations and/or noise). Its amplitude depends of geomagnetic latitude and sometimes attains such a high value as 0.4-0.5 (peak-to-peak) in high (>650) latitudes and varies within 0.01-0.15 in middle and low latitudes. Previous studies in middle latitudes led to conclusion that induction vector’s northern component Au is everywhere positive (maximum in June, minimum in December) and proposed a global source model for its description. This study states that in high latitudes Au is negative. 11-years variation found in ≈30% of observatories distributed in all latitudes but more frequently in aurora zones. Non-periodic transient variations of the induction vector also occur, in particular before strong earthquakes. In common, the behavior of the induction vector variations is complex with many local exceptions and irregularities that leads to supposition that they are not a simple «source effect», but contain information from the Earth interior and its environment including interactions in the system Earth-Sun-Moon-planets.
Session Keyword 7.0 Global and Planetary Studies
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