Isual Publications 2014

COM_FABRIK_ORDERpublish time # Citation abstract
200108 4 Han-Tzong Su, Alfred B. Chen, Siow- Fang Chen, R-R Hsu, S. B. Mende, R. L. Rairden, T. H. Allin, and T. Neubert,( 200100 ).Dynamical properties of Angel Sprites, IAGA-IASPEI Joint Scientific Assembly, Hanoi, Vietnam.
200108 5 Huang, M. A. and ISUAL collaboration( 200108 ).Study UV background by the ISUAL experiment, Proceedings of the 27th International Cosmic Ray Conference., Hamburg,, Germany. The UV background is an important noise for space borne air-fluorescent experiments such as OWL. However, very little is known about the UV background. One of its possible sources is lightning. Some upper atmosphere lightning could emit strong UV light and be misidentified as an up-going neutrino signal. The ISUAL (Image of Sprite: Upper Atmosphere Lightning) experiment on ROCSAT 2 will make global surveys of lightning induced luminous phenomena from orbit. This experiment employs a six-channel spectrophotometer with two channels targeting at 337.1nm and 391.4nm, which are the UV signals used by air-fluorescent experiments. The ISUAL will measure the global distribution of upper atmosphere lightning and airglow. Such information could help experiments such as OWL to reduce background noise due to lightning.
200108 6 H. T. Su, R. R. Hsu, S. B. Mende, R. L. Rairden, T. H. Allin, and T. Neubert( 200108 ).Dynamical Behavior of Sprites, AP-RASC '01, Tokyo, japan.
200108 7 Y. Takahashi, H. Fukunishi, S. B. Mende, H. T. Su, J. L. Chern, L.C. Lee, and R. R. Hsu( 200108 ).Strategy of Sprites and Elves Observation by ISUAL/ onboard ROCSAT-2 satellite, AP-RASC '01, Tokyo, japan.
200108 8 H. T. Su, J. L. Chern, L.C. Lee, R. R. Hsu, A. B. Chen, S. B. Mende, H. Fukunishi, and Y. Takahashi( 200108 ).Sprites Observation by ISUAL Onboard the ROCSAT-2 Satellite , AP-RASC '01, Tokyo, japan. (invited)
200109 9 H. T. Su, A. B. Chen, R. R. Hsu, and L.C. Lee( 200108 ).Observation of Sprites Over the Asian Continent, AP-RASC '01, Tokyo, japan.
200109 10 S. B. Mende, H. U. Frey, R. L. Rairden, H. T. Su, R. R. Hsu, T. H. Allin, T. Neubert, E. A. Gerken, and U. S. Inan( 200109 ).Fine Structure of Sprites and Proposed Global Observations, Solar-Terrestrial Magnetic Activity and Space Environment, Proceedings of the COSPAR Colloquium held in the NAOC, Beijing, china.
200112 11 S. B. Mende, L.C. Lee, J. L. Chern, R. R. Hsu, H. T. Su, H. Fukunishi, and Y. Takahashi( 200112 ).Satellite Observations of Upper Atmospheric Discharges With the ISUAL Instrument on the ROCSAT-2 Satellite, American Geophysical Union, Fall Meeting 2001, San Francisco, USA. (invited) The Imager of Sprites and Upper Atmospheric Lightning (ISUAL) experiment on ROCSAT 2 satellite will make the first synoptic spacecraft based measurements of lightning induced luminous phenomena. Science objectives of the ISUAL instrument are the determination of the spatial, temporal and spectral properties of lightning induced upper atmospheric optical flash transients (sprites, elves, blue jets etc.) and the global (geographic/seasonal) distribution of upper atmospheric optical flash transients. The ISUAL instruments consist of a limb viewing low light level imager with a set of bore sighted photometers and a dual channel high time resolution array photometer. The ISUAL imager spectrophotometer and array photometer will measure the spectral content, the spatial and temporal intensity distribution of the optical flashes uninhibited by the effects of lower atmospheric absorption. Intensity ratios of the various emissions will be used to determine the energetics of the excitation processes. The investigation will take advantage of coordinated observations with ground based simultaneous measurements of electric fields and VLF waves and optical imaging and photometry. The ISUAL payload flying at 891 km altitude in a 1000-2200 local time near sun-synchronous near polar orbit will be able to provide the first unbiased survey of lightning induced optical flashes over the entire globe in the midnight sector. From such a survey we will be able to determine whether the occurrence frequency of sprites depend on factors other than the magnitude of the storms such as the prevailing tropospheric or mesospheric conditions.
200112 12 R. R. Hsu, H. T. Su, A. B. Chen, M. H. Chang, and L.C. Lee ( 200112 ).Ground Observation of Sprites in Taiwan, American Geophysical Union, Fall Meeting 2001, San Francisco, USA. During the Sprites¡œ01 campaign, sprites were observed over thunderstorm systems in the southeast region of China and in the oceans around Taiwan. The observation location was on the Ali Mountain of Taiwan¡œs Central Ridge area with an altitude of 2413m and on the campus of National Cheng Kung University with an altitude of 50m. For the land sprites, 90% of them are either carrot or columniform sprites and 70% of the sprites occurring in groups. Their forms and occurrence frequency are very similar to those observed over the North American continent. For the oceanic sprites, carrot sprites account for 89% of the observed events, and 83% of the sprites occurring in singles. If one defines the thunderstorm, which continuously produces at least a sprite in 10 minutes interval to be a sprite active system. The active sprites generating periods for the observed thunderstorms are typically very short with an average time span around 30 minutes. The sprite production intensities for these Asian thunderstorms are estimated to be between I = 5.0 x10-4 sprites/km^2/hr to I = 1.2 x 10-3 sprites/km2/hr.
200208 13 H. T. Su, J. L. Chern, H. Fukunishi, R. R. Hsu, L.C. Lee, S. B. Mende, and Y. Takahashi( 200208 ).Global survey of lightning-induced transient luminous events on the rocsat-2 satellite, URSI-GA, Maastricht, Nederland. E4.O.4
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