secular variation

基本解釋

By statistical classification, tabulation and drawing, the distribution regularity and characters of the secular variation are gotten.
哪些屬于逐年下降，統(tǒng)計(jì)分類、列表、繪圖，最后得出了南極洲地磁長(zhǎng)期變化分布規(guī)律及變化特征。
After an analysis of the secular variation of the common Z-Term in latitude, the existence of the non-polar long period terms in latitude is verified.
本文從討論緯度公共Z項(xiàng)長(zhǎng)期變化的規(guī)律入手，證實(shí)了緯度非極變化中存在著某些長(zhǎng)周期項(xiàng)。
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(tái)1986～2005年的地磁觀測(cè)資料，對(duì)該地區(qū)地磁場(chǎng)長(zhǎng)期變化規(guī)律進(jìn)行總結(jié)分析。