VIDEO AND PHOTOGRAPHIC SPECTROSCOPY OF 1998 AND 2001 LEONID PERSISTENT TRAINS FROM 300 TO 930 nm |
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| Authors: | Shinsuke Abe Noboru Ebizuka Hideyuki Murayama Katsuhito Ohtsuka Satoru Sugimoto Masa-yuki Yamamoto Hajime Yano Jun-ichi Watanabe Ji?í Borovi?ka |
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| Institution: | (1) Astronomical Institute of the Academy of Sciences, Ondrejov, 25165, The Czech Republic;(2) RIKEN (The Institute of Physical and Chemical Research), Wako 351-0198, Saitama, Japan;(3) Tokyo Meteor Network, 1-27-5 Daisawa, Setagaya 155-0032, Tokyo, Japan;(4) Tochigi Astronomical Group, 1958-4 Tsurutamachi, Utsunomiya 320-0851, Tochigi, Japan;(5) Kochi University of Technology, 185 Miyanokuchi, Tosayamada 782-8502, Kochi, Japan;(6) Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara 229-8510, Kanagawa, Japan;(7) National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka 181-8588, Tokyo, Japan;(8) Astronomical Institute of the Academy of Sciences, Ondrejov, 25165, The Czech Republic |
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| 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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| Keywords: | Airglow Leonid meteor shower meteors persistent train astrobiology |
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