Isual Publications 2014

COM_FABRIK_ORDERpublish time # Citation abstract
200612 1 Mende, S. B.*, Y. S. Chang, A. B. Chen, H. U. Frey, H. Fukunishi, S. P. Geller, S. Harris, H. Heetderks, R. R. Hsu, L. C. Lee, H. T. Su and Y. Takahashi ( 200612 ), Spacecraft based studies of transient luminous events, NATO Science Series II: Mathematics, Physics and Chemistry, Volume 225, 123-149, (專書論文, Cited=10)

The Imager of Sprites and Upper Atmospheric Lightning (ISUAL) is a scienti fic payload on Taiwan’s FORMOSAT-2 (previously known as ROCSAT-2) that provides new observations of transient luminous events (TLEs) from space. The ISUAL project is an international collaboration between the National Cheng Kung University, Taiwan, Tohoku University, Japan and the instrument development team from the University of California, Berkeley. The project was supported by the National Space Program Office in Taiwan. The ISUAL payload includes a visible wavelength intensified CCD imager, a boresighted six wavelength spectrophotometer, and a two channel Array Photometer (AP) with 16 vertically spaced horizontally wide sensitive regions. The imager is equipped with 5 selectable filters on a filter wheel and a 6th open position. The spectrophotometer contains six filter photometer channels, their bandpasses ranging from the far ultraviolet to the near infrared regions. The two channel AP is fitted with broadband blue and red filters.

200904 2 Huang, T. Y., C. Y. Chiang, C. L. Kuo, A. B. Chen, H. T. Su and R. R. Hsu ( 200904 ), Investigations of Lightning-Induced Sudden Brightening in the OH Airglow Layer Observed By ISUAL Onboard FORMOSAT-II Satellite, , Volume 1118, 21-27, (專書論文, Cited=3)

We report observations of lightning-induced transient emissions (LITEs) in or below the OH airglow layer observed from the Imager of Sprites and Upper Atmospheric Lightning (ISUAL) onboard the FORMOSAT-II satellite. The ISUAL team conducted a nine-day campaign in January 2007 using both the broadband and narrowband filters on the CCD imager. It is found that LITEs occur more frequently in the OH airglow layer than below. It is also found that the observations of LITEs below the OH airglow layer by the narrow-band filter are rare. The observations of LITEs by the narrowband filter are the first of its kind in existence. Our data analysis shows that there is a significant intensity increase in the OH airglow layer when there is lightning and a residual intensity increase post the lightning activity. We propose that LITEs in the OH airglow layer could be due to OH species.

200904 3 Hsu, R. R., A. B. Chen, C. L. Kuo, H. T. Su, H. Frey, S. Mende, Y. Takahashi and L. C. Lee ( 200904 ), On the Global Occurrence and Impacts of Transient Luminous Events (TLEs), , Volume 1118, 99-107, (專書論文, Cited=10)

Based on the first four years of the ISUAL (Imager of Sprites and Upper Atmospheric Lightning) experiment onboard the FORMOSAT-2 satellite, ELVEs are found to be the most abundant type (~80%) of TLEs (transient luminous events), whereas sprites and halos only combine to account for ~20%. The distribution of sprites and halos closely resemble that of the cloud-to-ground lightning. However, nearly 60% of ELVEs occurred over the ocean, a feature indicating that the high peak current lightning is more abundant over the ocean. The global TLE occurrence rates are inferred to be 72, 3.7, and ~1 events/minute, respectively, for ELVEs, halos, and sprites. Comparing with the results from the first three years of the ISUAL experiment reported by Chen et al. [1], the global occurrence rates for ELVEs and halos are higher due to the adoption of different correction factors. Using these updated TLE rates, the free electron content over an ELVE hot zone is estimated to be elevated by more than 10%. From analyzing ISUAL TLE events without lightning emission contamination, the average deposited energy in the upper atmosphere by sprites, halos, and ELVEs was found to be 22, 14, and 19 MJ per event, respectively. After factoring in the occurrence rates, in each minute sprites, halos, and ELVEs deliver 22, 52, and 1370 MJs of troposphere energy to the upper atmosphere, which are also higher than those reported in Kuo et al. [2]. However, the global occurrence and energy rates for ELVEs are likely the lower-bound values. A past observation [3] and our ensuing analyses both indicate that the ELVES occurrence rate and, thus, their energy deposition rate in the upper atmosphere should be higher.

1999 4 陳志隆、許瑞榮、蘇漢宗等(1999),‘中華二號衛星的科學酬載 ─ 高空大氣閃電影像儀的介紹’,物理雙月刊21卷5期(科普文章)
1999 5 蘇漢宗、許瑞榮(1999),‘Sprite99 觀測記行’,物理雙月刊21卷5期(科普文章)
1999 6 吳壁如、許瑞榮(1999),‘紅色精靈的觀測回顧’,物理雙月刊21卷5期(科普文章)
1999 7 吳壁如、許瑞榮(1999),‘高空向上閃電—紅色精靈的理論回顧’,物理雙月刊21卷5期(科普文章)
200106 8 許瑞榮(200106),‘認識紅色精靈(四之一):第一次在台灣捕捉到紅色精靈’,國語日報2001/06/19/第八版(科普文章)
200106 9 許瑞榮(200106),‘認識紅色精靈(四之二):台灣也可以從事紅色精靈的觀測’,國語日報2001/06/26/第八版(科普文章)
200107 10 許瑞榮(200107),‘認識紅色精靈(四之三):研究團隊守株待兔觀察紅色精靈’,國語日報2001/07/03/第八版(科普文章)
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