Investigation of the SA evolution by using the CHAOS-4 model over 1997–2013
| Autor: | DU Ai-Min, OU JiaMing, Wen-Yao Xu |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010504 meteorology & atmospheric sciences
Geomagnetic secular variation Oscillation Equator Geophysics 010502 geochemistry & geophysics Geodesy 01 natural sciences Geomagnetic jerk Acceleration Jerk Earth's magnetic field Core–mantle boundary General Earth and Planetary Sciences Geology 0105 earth and related environmental sciences |
| Zdroj: | Science China Earth Sciences. 59:1041-1050 |
| ISSN: | 1869-1897 1674-7313 |
| DOI: | 10.1007/s11430-016-5265-0 |
| Popis: | The temporal and spatial evolution characteristics of the geomagnetic secular acceleration (SA) are investigated, based on CHAOS-4 core field model during the period of 1997–2013. The SA evolution on a short time scale is associated with the phenomenon of the geomagnetic jerk. More details of the global extent and the occurrence time of the successive jerks (the 1999, 2003, 2007, and 2011 jerks) are obtained. The location, size and reversed polarity pattern for the 1999 jerk are similar to those for the 2003 jerk in the Asian-Indian sector. While the 2007 and 2011 jerks mainly take place in the Atlantic sector. The direction and speed of the shift for the four jerks are different, identified by the occurrence time of the jerks. The zonal motions of the SA patches exhibit an oscillation pattern in the Asian-Indian sector, whereas a purely westward drifting pattern is along the equator in the Atlantic sector. It is believed that the shift of the jerks is related to the motion of SA-B r patches observed at the core-mantle boundary (CMB). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink