HR: 10:35h
AN: AE42A-02    [Abstracts]
TI: Blue And Gigantic Jets From Taiwan 2007 TLE Campaign
AU: * Chou, J
EM: c2491120@phys.ncku.edu.tw
AF: Department of Physics, National Cheng-Kung University, No. 1 University Road, Tainan, 70101, Taiwan
AU: Tsai, L
EM: f4489662@phys.ncku.edu.tw
AF: Department of Physics, National Cheng-Kung University, No. 1 University Road, Tainan, 70101, Taiwan
AU: Kuo, C
EM: johnny@phys.ncku.edu.tw
AF: Department of Physics, National Cheng-Kung University, No. 1 University Road, Tainan, 70101, Taiwan
AU: Lee, Y
EM: yjlee@phys.ncku.edu.tw
AF: Department of Physics, National Cheng-Kung University, No. 1 University Road, Tainan, 70101, Taiwan
AU: Chen, Y
EM: yjchen@phys.ncku.edu.tw
AF: Department of Physics, National Cheng-Kung University, No. 1 University Road, Tainan, 70101, Taiwan
AU: Hu, C
EM: cphu@phys.ncku.edu.tw
AF: Department of Physics, National Cheng-Kung University, No. 1 University Road, Tainan, 70101, Taiwan
AU: Chen, A B
EM: alfred@phys.ncku.edu.tw
AF: Department of Physics, National Cheng-Kung University, No. 1 University Road, Tainan, 70101, Taiwan
AU: Chen, A B
EM: alfred@phys.ncku.edu.tw
AF: Plasma and Space Science Center, National Cheng-Kung University, No. 1 University Road, Tainan, 70101, Taiwan
AU: Su, H
EM: htsu@phys.ncku.edu.tw
AF: Department of Physics, National Cheng-Kung University, No. 1 University Road, Tainan, 70101, Taiwan
AU: Hsu, R
EM: rrhsu@phys.ncku.edu.tw
AF: Department of Physics, National Cheng-Kung University, No. 1 University Road, Tainan, 70101, Taiwan
AU: Lee, L
EM: loulee@ncu.edu.tw
AF: Institute of Space Science, National Central University, 300 Jhongda Road, Jhungli, Taoyuan, 32001, Taiwan
AB: Blue and gigantic jets are believed to be blue luminous phenomena. In Taiwan 2007 TLE campaign, a multi- wavelength imaging system was deployed with the aim to elucidate the physical and chemical characteristics of TLEs. On 22 July 2007, twenty blue/gigantic jets and four sprites were observed to occur over a frontal system in Fujian province of China, about 400km away from our observation site at Lulin Observatory, Taiwan. All the observed jets showed little blue band (380-510nm) emissions but had easily recognizable signals in red band (570-2700nm). This result indicates that jets observed from ground are reddish and most of the blue emissions are extinct. One of the jets was observed to propagate upward to ~75km elevation, thus it can be identified as a GJ and is similar to the GJ-event observed by Pasko et al (2001). This GJ was launched 200ms after a small jet from the same cloud top. This implies that the smaller jet could be regarded as the leader of this GJ, similar to the stepped/dart leader in a CG flash. Since the blue luminous events in ISUAL data (Su, et. al. 2005 AGU) have similar features as the jets in this ground observation. Thus, we can conclude that the ISUAL blue luminous events also are blue jets or blue starters. Even though blue jets and blue starter have different ISUAL SP2 (N2 2P, 337.0nm), SP3 (N2 1N, 391.4nm) and SP6 (250-390nm) intensities, but the peak ratio between SP2 and SP6 are ~ 0.5 and the peak ratio between SP3 and SP2 are ~ 0.07. This means blue jets and starters possess the same spectral properties and the same degree of ionization. Finally, the relation between jets and the nearby lightning will also be addressed.
DE: 3304 Atmospheric electricity
DE: 3311 Clouds and aerosols
DE: 3324 Lightning
SC: Atmospheric and Space Electricity [AE]
MN: 2007 Fall Meeting