jgg     2009 29 (2):  82-87    ISSN: 0412-1961  CN: 21-1139/TG STUDY ON MODEL BUILDING IN RHA OF LOCAL OCEAN GEOMAGNETIC FIELD Zhao Jianhu; Liu Hui ;and Wang Shengping School of Geodesy and Geomatics, Wuhan University, Wuhan 430079 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null