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Horizontal distributions of sprites derived from the JEM-GLIMS nadir observations

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Title: Horizontal distributions of sprites derived from the JEM-GLIMS nadir observations
Authors: Sato, M. Browse this author
Mihara, M. Browse this author
Adachi, T. Browse this author
Ushio, T. Browse this author
Morimoto, T. Browse this author
Kikuchi, M. Browse this author
Kikuchi, H. Browse this author
Suzuki, M. Browse this author
Yamazaki, A. Browse this author
Takahashi, Y. Browse this author
Inan, U. Browse this author
Linscott, I. Browse this author
Ishida, R. Browse this author
Sakamoto, Y. Browse this author
Yoshida, K. Browse this author
Hobara, Y. Browse this author
Keywords: lightning
Issue Date: 17-Apr-2016
Publisher: American Geophysical Union
Journal Title: Journal of geophysical research atmospheres
Volume: 121
Issue: 7
Start Page: 3171
End Page: 3194
Publisher DOI: 10.1002/2015JD024311
Abstract: Global Lightning and Sprite Measurements on Japanese Experiment Module (JEM-GLIMS) started the nadir observations of lightning discharges and transient luminous events (TLEs) from the International Space Station (ISS) since November 2012. In the nadir observations, JEM-GLIMS optical instruments have to simultaneously detect incomparably intense lightning emissions and weak TLE emissions. To distinguish TLEs, especially sprite events, from lightning events, combined data analytical methods are adopted: (1) a subtraction of the wideband camera image from the narrowband camera image, (2) a calculation of the intensity ratio between different photometer channels, and (3) an estimation of the polarization and charge moment changes for the TLE-producing lightning discharges. We succeeded in identifying numbers of sprite events using the combined analytical methods, and here we report three sprite events detected by JEM-GLIMS as a case study. In the subtracted images, sprite emissions are located over the area of the sprite-producing lightning emissions. However, these sprites and sprite-producing lightning discharges did not occur at the nadir point of the ISS. For this reason, the geometry conversion of the sprite and sprite-producing lightning emissions as observed from the point just over the sprite-producing lightning discharges is performed. In the geometry-converted images, the locations of the sprite emissions are clearly displaced by 8-20km from the peak positions of the sprite-producing lightning emissions. Thus, the first quantitative spatial distributions of sprites and sprite-producing lightning discharges from the JEM-GLIMS nadir observations are revealed.
Rights: Copyright 2016 American Geophysical Union.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 佐藤 光輝

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