PEMODELAN POLA ARUS GEOSTROPIK DI PERAIRAN INDONESIA MENGGUNAKAN DATA SATELIT ALTIMETRI ENVISAT

. Ocean current is movement of ocean water masses both horizontally and vertically that occur over a wide area. Data dynamics and ocean current patterns are very important for the field of shipping, fisheries, and climate determination. Acquisition of ocean current data using conventional tools is very difficult to do for large areas and requires a large fee Therefore, the data that is used is from altimetry satellite. The main objective of this study was to make geotrophic ocean current movement by using the data of Sea Level Anomaly (SLA) from altimetry satellite and analyzed flow patterns based on the Wyrtki current patterns that flow that comprehensively describes the current pattern of the Indonesian waters s This study used 8 cyle i.e cycle 85, 86, 87, 88, 90, 91, 92, and 93 to calculate the standard deviation of the Envisat satellite data and 2 cycles is cycle 87 and 92 to determine the value of SSH and SLA which was then used to make geosthropic current model. Cycle 87 represented the current model in February 2010, while cycle 92 represented the current model in August 2010 that shown model when blows west monsoon wind and east monsoon wind. In the process of making current model required a reference in the form of the geoid that was the reason global geoid models EGM2008 is used which was published by the International Centre for Global Earth Models (ICGEM). Current model that had been formed then compared with Wyrtki current model The Results of this study showed that SSH in region of Indonesian waters were in the range -90 to 90 meters with. 98.69% from the data had standard deviation less than 1 meter. It showed that the data of SHH Envisat satellite had a high degree of precision. Furthermore obtained-SLA from the reduction of SSH value by the value of geoid undulations from MGG EGM2008 were in the range of 0 to 2.8 meters. Generally, SLA value in February and August produced the current model followed the movement of current of west monsoon and current of east monsoon which is dominant in the Indonesian region. There are some current model which doesn�t match with Wyrtki current model, but there are some current model which match with Wyrtki current model in region sample, such as : Jawa sea, Banda sea, North Australia�s waters, Hindia Ocean, and Pasifik Ocean. Current model from SLA ENVISAT had more complex current patterns when it compared with Wyrtki current model because of the dense interval between the points of satellite record