Isual Publications 2014

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200208 14 Y. Takahashi, T. Adachi, J. L. Chern, H. Fukunishi, R. R. Hsu, L.C. Lee, S. B. Mende, and H. T. Su( 200208 ).Observation of transient optical emissions in the middle and upper atmosphereusing array photometer, URSI-GA, Maastricht, Nederland. E4.P.4
200208 15 J.L. Chern, R.R. Hsu, H. T. Su, S.B. Mende, H. Fukunishi, Y. Takahashi, and L.C. Lee( 200208 ).Sprites observation on the ROCSAT-2 satellite, URSI-GA, Maastricht, Nederland. (invited)
200212 16 H. T. Su, R. R. Hsu, A. B. Chen, W. S. Hsiao, W. C. Lai, Y. C. Wang, and L.C. Lee ( 200212 ).Gigantic transient luminous events with long duration*, American Geophysical Union, Fall Meeting 2002, San Francisco, USA. A62D-03 During the Sprites 2002 campaign in Taiwan, five gigantic transient luminous events (TLEs) were observed to occur over an oceanic thunderstorm. The morphology of these transient luminous events appears to be a hybrid of blue jet and sprite. The upper part resembles a sprite while the lower half is jet-like. These events visually span from the lower atmosphere to the E-layer ionosphere at 100 km. The luminous duration of these events ranges between 200ms to 400ms, which is much longer than that of typical sprites. In this paper, the morphology, temporal evolution, and possible generating mechanism of these gigantic TLE events will be presented. * This work was supported in parts by research grants NSC91-NSPO(B)-ISUAL-FA09-01 and NSC91-2111-M006-002.
200312 17 H. T. Su, R. R. Hsu, A. B. Chen, Y. C. Wang, M. Sato, H. Fukunishi, and L.C. Lee( 200312 ).Fine structures, velocity and the ELF signature of gigantic jets*, American Geophysical Union, Fall Meeting 2003, San Francisco, USA. AE41B-04(invited) Gigantic jet is a type of transient luminous events that optically connect thundercloud-top and the ionosphere [Su et al., Nature 423, p974-976, 2003]. The dynamical evolution of gigantic jets can be divided into three stages: the leading jet, the fully developed stage, and the trailing jet. At the fully developed stage, the upper portion of the gigantic jets is very similar to classical sprites, and the lower portion remembers blue jets. In this talk, a few interesting properties and the spatial-temporal evolution of the fine structures of gigantic jets will be discussed. The ELF and the lightning signatures of the gigantic will also be compared, and a possible generating mechanism will be presented. * This work was partially supported by 92-NSPO(B)-ISUAL-FA09-01 and NSC 92-2111-M-006-002
200312 18 A. B. Chen, T. T. Wang, T. H. Huang, C. L. Kuo, R. R. Hsu, H. T. Su, J. L. Chern, S. B. Mende, Y. Takahashi, H. Fukunishi, and L.C. Lee( 200312 ).Observations of transient luminous events on the ROCSAT-2 satellite using ISUAL instruments*, American Geophysical Union, Fall Meeting 2003, San Francisco, USA. AE42A-0792 ISUAL is a scientific payload of ROCSAT2 satellite, which is to be launched in November of 2003. The ISUAL instrument consists of a high-speed CCD imager, a six-channel spectrophotometer, and a red/blue band array photometer. Operating from a low-earth orbit, the instruments will facilitate long term, global survey of transient luminous events (TLES), and measure the spatial-temporal evolution of these upper atmospheric luminous phenomena. Through the ISUAL payload, we hope to learn the global distribution of TLES and to explore the possible unknown properties of TLEs from space. In this presentation, the salient characteristics of the ISUAL instruments will be introduced, as well as the observation strategy and the operation scenario. Besides devoting the majority of time towards observing TLEs, the project also will allocate a portion of time to other worthy scientific causes. International collaborations and observation proposals using ISUAL instruments are welcomed.
200312 19 C. L. Kuo, R. R. Hsu, A. B. Chen, H. T. Su, Y. C. Wang, C. K. Chang, Y. J. Lee, H. C. Wang, W. Y. Wang, and L.C. Lee( 200312 ).ICCD imagery of oceanic sprites*, American Geophysical Union, Fall Meeting 2003, San Francisco, USA. AE42A-0793 As reported in Su et al [GRL vol. 29(4), doi 10.1029/2001GL013737, 2002] and Hsu et al [JASTP vol. 65, p561-566, 2003], the oceanic sprites tend to appear in single column, which is in sharp contrast with the clustering land sprites. In the 2003 Taiwan Sprites campaign, one of the scientific goals is to study the oceanic sprites in detail. The recorded images confirm the oceanic/land morphology disparity as reported before. Three of the ICCD cameras deployed in this campaign were equipped with R, G, B filters to obtain high spatial resolution and tri-color optical images. From the red and blue bands images, the spatial distribution and the energy of oceanic sprites could be evaluated. We will also compare the energy distribution of various types of oceanic sprites. Using stars in the star field as standard luminous gauges, the optical brightness of the oceanic sprites was estimated to exceed 5 MR. Using ICCD cameras set to different gain levels; the spatial brightness distribution of the oceanic sprites was also explored. * This work is supported in part by 92-NSPO(B)-ISUAL-FA09-01 and NSC 92-2111-M-006-002.
200312 20 Y. C. Wang, C. L. Kuo, A. B. Chen, R. R. Hsu, H. T. Su, and L.C. Lee( 200312 ).ELF/VLF monitoring of lightning activity in Taiwan*, American Geophysical Union, Fall Meeting 2003, San Francisco, USA. AE42A-0799 Currently, there are two long-range lightning monitoring systems operating in Taiwan; one is a VLF/ELF electric field detection system and the other one is an ELF (SR) magnetic field system. The electric field system detect the electric sferics emitted by lightning in the 1 Hz to 22 kHz range. The magnetic system operates in the frequency range of 1 Hz to 100 Hz. In the 2003 Taiwan Sprites campaign, these two systems worked in parallel with a set of ICCD cameras to study oceanic sprites occurring in the South China Sea. From the ELF and optical data, the correlation between optical luminosity of sprites and amplitudes of their associate ELF emission was found. We will also discuss the possible correlation between the morphology of sprites and the waveform of their associate ELF signals. * This work was partially supported by 92-NSPO(B)-ISUAL-FA09-01 and NSC 92-2111-M-006-002
200405 21 Y. C. Wang, C. L. Kuo, A. B. Chen, Y. J. Lee, H. T. Su, R. R. Hsu, and L. C. Lee( 200405 ).Electromagnetic characteristics of ocean and land TLE events, ROCSAT-2 Science Workshop, Taoyuan, Taiwan.
200405 22 A. B. Chen, T. H. Huang, C.L. Kuo, R. R. Hsu, and H. T. Su( 200405 ).Early orbit check, calibration and data processing of ISUAL payload, ROCSAT-2 Science Workshop, Taoyuan, Taiwan.
200405 23 H. Fukunishi, Y. Takahashi, M. Sato, T. Adachi, S. B. mende, H. T. Su, and R. R. Hsu( 200405 ).Energetic of lightning-induced Transient Luminous Events Derived from coordinated ROCSAT-2/ISUAL and Ground ELF observstion., ROCSAT-2 Science Workshop, Taoyuan, Taiwan.
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