The Initial Results from the LITN of the FORMOSAT-3 TBB Program
Tung‐Yuan Hsiao, Lung‐Chih Tsai, Chao-Han Chu · Terrestrial Atmospheric and Oceanic Sciences · 2009
AB STRACTBe gin ning in 2006, four ground sta tions lo cated at Chung-Li (25.136°N, 121.539°E),TasoTun (23.981°N, 120.697°E),CheCheng (22.725°N, 120.544°E), and trop i cal Itu Aba Is land (10.06°N, 114.350°E) were set up to re ceive bea con sig nals from six FORMOSAT-3/COS MIC (Bernhardt et al. 2000) and other NNSS-like sat el lites.By ap ply ing dif fer en tial Dopp ler tech nique on three quad ra ture com po nents of the three-band bea con sig nals, we were able to ob tain to tal elec tric con tents (TEC) val ues and scin til la tion along the ra dio path through the ion o sphere.Such mea sure ments can be used to de rive re gional ion o spheric ir reg u lar ity and to mog ra phy.In this pa per, we have con firmed the power pat terns con trib uted from the trans mit ting an ten nas on board FS3/COS MIC and the ground-based re ceiv ing an ten nas.The multi pli ca tive al ge braic re con struc tion tech nique (MART) al go rithm has also been im ple mented to re con struct ion o spheric to mog ra phy im ages.Ob ser va tions of the di ur nal vari a tions and the dy nam ics of equa to rial anom aly showed that the equa to rial anom aly ap peared at 0800 LT, and then sub se quently moved to ward the Earth's poles.The north crest was stron gest at ~1300 LT and its core was lo cated at about 10°N of the mag netic lat i tude (~20°N geo graphic latitude).Afterwards, the crest moved toward the equator after sunset and disappeared after midnight.