geomagnetic secular variation

常見例句

No anomalous local secular geomagnetic variation has been found in the area.
測區(qū)內(nèi)未發(fā)現(xiàn)有局部地磁長期變化異常。
According to observation data at geomagnetic stations in Hebei Province from 1986 to 2005, we sum up and analyze the laws of the geomagnetic secular variation in this paper.
利用河北省地磁臺1986～2005年的地磁觀測資料，對該地區(qū)地磁場長期變化規(guī)律進行總結分析。
According to the observation data at Guangzhou geomagnetic observatory from 1958 to 1995, we summarize the laws of the geomagnetic secular variation in Guangzhou geomagnetic observatory.
本文利用1958～1995年已正式出版的《地磁觀測報告》資料對廣州地磁臺地磁場的長期變化進行分析研究。