| dc.description.abstract | It has established a network of geomagnetic stations in Taiwan since 2002. This sampling rate is 1 sample per second. The earliest study of geomagnetic in Taiwan is Yeh et al., (1981), they has been observed geomagnetic field in Taiwan. They found that there are three periods 24, 12 and 8 hours in magnetic field.
In this study, we also use the magnetic data of Taiwan from 2009 to 2011 analysis magnetic background and discussion. We expect to find out geomagnetic characteristics in Taiwan area.
In addition, we find that the diurnal variation of the magnetic data in Hengchun station is much larger than other magnetic stations. In order to investigate why the diurnal variation is larger only in Taiwan, we add Guangzhou and Spain station whose magnetic latitude is similar to Taiwan and seek for the relationship between diurnal variation and magnetic latitude. The results show that the diurnal variation of Guangzhou and Spain station is smaller than the diurnal variation of the Hengchun station.
In order to investigate the reason of the diurnal variation of the Hengchun station is much larger than other magnetic stations, the temporary stations had been set for two to three days recording in the Hengchun Peninsula on September and October in 2012. Then comparing these data with Hengchun, Taitung, Pingtung magnetic stations, we find the diurnal variation decrease gradually from south to north in the Hengchun Peninsula. Then, the temporary stations had been set again on January in 2013. Finally, we compared and discussed between our results and the previous studies about the geomagnetic coast effect. In this study, we presumably because the Hengchun is Peninsula region, the distance between the station and the coastline is nearer the other stations in Taiwan. So the diurnal variation of Hengchun Peninsula is larger than other stations in Taiwan. | en_US |