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LUNAR PHASE-EFFECT ON AMPLITUDE VARIATION OF Z COMPONENT ON MAGNETICALLY QUIET DAYS

DING JIANHAI HUANG XUEXIANG (Onalysis and Prediction Center, State Seismological Bureou)  
Based on the observational data of three geomagnetic observatories during 10 to 24 years in China, it has been revealed that lunar phaseeffect on Z amplitude variation on magnetically quiet days exists with cetain regularity. The basic feature is the half-month periodicity. The amplitude of the lunar phase-effect may reach 2-8γ in value. It should not be neglected in studying the amplitude variation of Z component,
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