Electric field transition between the diffuse and streamer regions of sprites estimated from ISUAL/array photometer measurements

T. Adachi, H. Fukunishi, Y. Takahashi, Y. Hiraki, R. R. Hsu, H. T. Su, A. B. Chen, S. B. Mende, H. U. Frey, L. C. Lee

研究成果: Article同行評審

46 引文 斯高帕斯(Scopus)

摘要

We analyze optical data of twenty sprites and three halos observed by the array photometer which is a scientific instrument of the ISUAL payload on the FORMOSAT-2 satellite. The altitude distribution of electric field is derived from the ratio of blue to red emission intensity by assuming all emissions are due to the electron impact excitation of nitrogen molecules. We find a clear transition at ∼75 km altitude from the upper-diffuse to lower-streamer region. Estimated electric field intensities in the diffuse region are 0.5-0.7 Ek, which support the theoretical expectation that their optical emissions could be produced without significant ionization. On the other hand, those in the streamer region are 1-2 Ek which is a few times less than predicted fields in the streamer head. We suggest that this discrepancy is due to the long-lasting components such as the lower portions of the upward branches and bead structures.

原文English
文章編號L17803
期刊Geophysical Research Letters
33
發行號17
DOIs
出版狀態Published - 2006 九月 1

All Science Journal Classification (ASJC) codes

  • 地球物理
  • 地球與行星科學(全部)

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