摘要
用Ｖｏｎｄｒａｋ多级滤波器方法来研究新技术测定的日长变化及美国气象中心（ＮＭＣ）提供的大气角动量（ＡＡＭ）的周年项振幅变化特征．结果表明，由大气角动量变化引起的日长变化要比测量的日长变化大２０％．本文目的是分析太阳风施加于地球磁层所产生的力矩，这力矩可作为对日长变化中周年波动的一种贡献。
Applying Vondrak narrow band fliter on high precision the Length of Day(LOD) measurements provided by space observation terhniques as well as Atmosphere Angular Momentum(AAM) Computed by U.S.National Meteorological Center(NMC), the variation in amplitude of the annual components are shown.From fliter series of LOD and AAM, it found that the annual variation of the LOD induced by AAM.about 20% higher than observed one. The aim of this work is to investigate how the torque induced by the solar wind on the earth's magnetosphere could be contribuded to explain this excess.The advocated dynamical mechanism could counterbalance annual discrepancies between AAM and LOD by amount of 20%.Therefore, the torque produced by the solar wind on earth might be considered as one of the most possible contributions to annual fluctuation in LOD.
出处
《地球物理学报》
SCIE
EI
CSCD
北大核心
1994年第A02期38-45,共8页
Chinese Journal of Geophysics
关键词
大气角动量和日长
周年变化
差异
Atmosphere
Angular
Momentum and Length of Day
Annual discrepancies
Mechanism explanation.
