Abstract
Spectra of persistent meteor trains were observed at wavelength between 300 and 930 nm. Two obtained train spectra during the 1998 and 2001 Leonid meteor showers are reported here. During the 1998 Leonids, one train was detected by a photographic camera with a spectrograph covering 370–640 nm region. On the other hand, during the 2001 Leonids, video observations were carried out using image intensified cameras in ultraviolet (UV), visible and near infrared (near-IR) wavelengths. Temperatures in persistent trains have been measured by atmospheric O2 A(0,1) band at the wavelength near 864.5 nm. From a video spectrum obtained just 7 s after parent fireball’s flare, a rotational temperature of 250 K at altitude of 88.0±0.5 km was estimated. We can say that the cooling time scale of train strongly depends on the initial mass of its fireball at least for Leonids. Based on cooling constant calculated from our results, we estimated a temperature of ∼ ∼130 K as a final exothermic temperature at early stage of persistent trains.
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Acknowledgements
Special thanks are due to M. Toda and Y. Higa (NMS/METRO) for providing us triangulation images of persistent trains. The authors would like to thank M. Inoue (Nobeyama Radio Observatory, NAOJ/NINS) for their observational support. This research was supported by the National Astronomical Observatory of Japan of National Institutes of Natural Sciences, the Institute of Space and Astronautical Science of Japan Aerospace Exploration Agency, RIKEN (the Institute of Physical and Chemical Research), and the National Institute of Information and Communications Technology. This study is carried out as a part of “Ground-based Research Announcement for Space Utilization” promoted by Japan Space Forum. S.A. is supported by JSPS Postdoctoral Fellowships for Research Abroad.
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Abe, S., Ebizuka, N., Murayama, H. et al. VIDEO AND PHOTOGRAPHIC SPECTROSCOPY OF 1998 AND 2001 LEONID PERSISTENT TRAINS FROM 300 TO 930 nm. Earth Moon Planet 95, 265–277 (2004). https://doi.org/10.1007/s11038-005-9031-0
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DOI: https://doi.org/10.1007/s11038-005-9031-0