AE33C-0511
Triangulation of the Gigantic Jets in 20 August 2014
Wednesday, 16 December 2015
Poster Hall (Moscone South)
Peng Kang-Ming1, Rue-Ron Hsu2, Han-Tzong Su2, Alfred Bing-Chih Chen2,3, Jung-Kuang Chou2, Shu-Chun Chang1, Yen-Jung Wu1, Hung Chien-Lun3, I-Ching Yang4 and Sung-Hui Tsai5, (1)NCKU National Cheng Kung University, Tainan, Taiwan, (2)National Cheng Kung University, Tainan, Taiwan, (3)National Penghu University, Penghu, Taiwan, (4)National Taitung University, Taitung, Taiwan, (5)Kinmen Jin-Cheng Junior High School, Kinmen, Taiwan
Abstract:
Coordinate optical observation campaigns on TLEs near Taiwan are held since 2011 with the aim to triangulate TLEs. Currently, there are four stations with baseline varying from 100 to 400 km between them. Our optical observation systems recorded 48 various types of TLEs on the night of 20 August 2014, with eight of them being gigantic jets that were recorded by at least two stations. Due to the length of baselines and the TLE occurring locations, the earth curvature needed to be taken into account by means of spherical trigonometry method. The preliminary results shows the gigantic jets occurred over the northern Taiwan and the accuracy of geolocation is less than 1 km and the accuracy of the retrieval height on the key structures is less than 0.5 km. The triangulation results of the eight events indicate most of these gigantic jets terminated at 80-90km, but one of the gigantic jets is likely extend to 100 km. Three of the eight gigantic jets occurred consequently after previous one with time interval of 500ms to more than 100s. The previous gigantic jet is likely to influence the consequent gigantic jet for usually the consequent gigantic jet has more beads structures in high altitude and one of the streamer column of a consequent gigantic jets at 55 -60 km is identified to re-bright, which is more than 100s after the previous gigantic jet.
