Abstract
Observations of persistent meteor trains are limited because of the extreme rarity of the phenomenon. The altitudinal distribution of persistent trains has previously been investigated via limited instances of simultaneous observation from multiple sites, however, a statistical study of persistent trains has yet to be realized. The meteor train observation (METRO) campaign was established in Japan in 1998 to obtain images of persistent trains. From 1998 to 2002, the METRO campaign, involving Japanese amateur collaborators, captured more than 400 image sequences of persistent trains, resulting in 53 simultaneous multi-site observations. Several Japanese observers were involved in imaging persistent trains prior to the METRO campaign, producing 6 simultaneous observations over the period 1988–1997. In this paper, simultaneous multi-site observations of high spatial and temporal resolution are used to determine, via triangulation, the altitudinal distribution of persistent trains for 20 events. The altitudinal range of 2 Orionid trains was slightly higher than that of 18 Leonid trains. The Leonid train data reveal no clear dependence of upper and lower altitude on the brightness of the associated fireball. The upper altitude of the 18 observed Leonid trains were almost invariant with respect to local time (LT) of observation, however, a possible dependence of lower altitude on LT of observation was also found, indicating a near-constant penetrating path-length in the upper atmosphere for each train. The average upper altitude of persistent Leonid trains was 99.8 km, while the average central altitude was 93.0 km. These trends are probably determined by atmospheric conditions such as the abundance of O and O3.
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Acknowledgements
The authors are very grateful to all observers who kindly reported their worthy observations to the METRO campaign archives. The authors wish to express their sincere thanks to Yasuo Shiba, Yoshihiko Shigeno, Satoshi Suzuki, Takashi Sekiguchi, Katsuhito Ohtsuka, Chikara Shimoda, Mitsuhiro Fujita, Yasushi Yadoumaru, Atsushi Miyamoto, and anonymous reviewers. This research was supported by the National Astronomical Observatory of Japan of National Institutes of Natural Sciences and the KAKENHI (Grant-in Aid for Young Scientists (B)) 16740280 from MEXT (Ministry of Education, Culture, Sports, Science and Technology), Japan.
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Yamamoto, MY., Toda, M., Higa, Y. et al. Altitudinal Distribution Of 20 Persistent Meteor Trains: Estimates Derived From Metro Campaign Archives. Earth Moon Planet 95, 279–287 (2004). https://doi.org/10.1007/s11038-005-9048-4
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DOI: https://doi.org/10.1007/s11038-005-9048-4