Buoyancy of the "Y2K" persistent train and the trajectory of the 04 : 00 :29 UT Leonid fireball

Citation
P. Jenniskens et Rl. Rairden, Buoyancy of the "Y2K" persistent train and the trajectory of the 04 : 00 :29 UT Leonid fireball, EARTH MOON, 82-3, 2000, pp. 457-470
Citations number
10
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
EARTH MOON AND PLANETS
ISSN journal
0167-9295 → ACNP
Volume
82-3
Year of publication
2000
Pages
457 - 470
Database
ISI
SICI code
0167-9295(2000)82-3:<457:BOT"PT>2.0.ZU;2-I
Abstract
The atmospheric trajectory is calculated of a particularly well studied fir eball and train during the 1999 Leonid Multi-Instrument Aircraft Campaign. Less than a minute after the meteor's first appearance, the train curves in to a "2"-shape, which persisted until at least 13 minutes after the firebal l. We conclude that the shape results because of horizontal winds from grav ity waves with a scale height of 8.3 km at 79-91 km altitude, as well as a westerly wind gradient with altitude. In addition, there is downward drift that affects the formation of loops in the train early on.