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| 題名: | Ionization emissions associated with N2+ 1N band in halos without visible sprite streamers |
| 作者: | 郭政靈;Kuo, C. L.;Williams, E.;Bór, J.;Lin, Y. H.;Lee, L. J.;Huang, S. M.;Chou, J. K.;Chen, A. B.;Su, H. T.;Hsu, R. R.;Sátori, G.;Frey, H. U.;Mende, S. B.;Takahashi, Y.;Lee, L. C. |
| 貢獻者: | 地球科學學院太空科學與工程學系 |
| 關鍵詞: | Electric fields;Emissions;Geophysics;Halo;Ionization;Ions;ISUAL;Lightning;TLE |
| 日期: | 2013-01-01 |
| 上傳時間: | 2026-04-23 11:04:23 (UTC+8) |
| 出版者: | Wiley-Blackwell;Washington: Blackwell Publishing Ltd |
| 摘要: | 摘要： We report the ionization emission associated with N2+ 1N band in a halo event without visible sprite streamers. To avoid the lightning contamination to the ionization emission, we find halos whose parent lightning light is blocked by the Earth's limb. Five halos in the 2004–2010 Imager of Sprites and Upper Atmospheric Lightning data set were identified as halos without visible sprite streamers. A halo with maximum N2 1P brightness had significant ionization emission of N2+ 1N. The time‐integrated photon intensity of N2 1P, N2 2P, and N2+ 1N emission is 2.2 × 105, 2.1 × 104, and 7.4 × 102 photons cm−2, respectively at a distance of 4130 km. The total number of photons of N2 1P, N2 2P, and N2+ 1N band emissions are 4.6 × 1023, 4.3 × 1022, and 1.6 × 1021 photons, respectively. In the halo region, the electron density increased as 1–2 orders of magnitude higher than ambient electron density. From the emission ratio of N2+ 1N to N2 2P, the reduced electric field is estimated to be 275–325 Td that is higher than the conventional breakdown electric field. The recorded electric field related to this halo event is produced by a lightning discharge that has a total charge moment change of −1450 C km. Based on the estimated electric field from optical emissions, it is found that the lightning‐induced electric field in the bright halo region is significantly relaxed with a rate faster than that estimated using ambient electron density, in agreement with previous modeling results showing that the electron density enhancement due to the ionization processes leads to a short dielectric relaxation time inside the halo region. Key Points The ionization emission N2+ 1N in a halo event was observed. The electron density in the halo increased as 1‐2 orders higher than background. The reduced electric field in the halo was estimated to be 275 ‐ 325 Td.
其他題名： J. Geophys. Res. Space Physics
出版者： Washington: Blackwell Publishing Ltd
出版日期： 2013-08
出處： Journal of geophysical research : Space physics (2013 - Present), 2013-08, Vol.118 (8), p.5317-5326
資源來源： Wiley Online Library
版權： 2013. American Geophysical Union. All Rights Reserved.
識別號： ISSN: 2169-9380
識別號： ISSN: 2169-9402
識別號： EISSN: 2169-9402
識別號： DOI: 10.1002/jgra.50470 |
| 顯示於類別: | [太空科學與工程學系] 期刊論文
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