Physics
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35.1109s&link_type=abstract
Meteoritics & Planetary Science, vol. 35, no. 5, pp. 1109-1115 (2000).
Physics
27
Scientific paper
In this paper we study the extremely high beginning parts of atmospheric trajectories of seven Leonid meteors recorded by sensitive TV systems equipped with image intensifiers up to apparent magnitude +6.5. For all the seven cases we observed comet-like diffuse structures with sizes of the order of kilometers and quickly developing during the meteoroid penetration through the atmosphere. For the brightest event with maximum absolute magnitude of -12.5, we observed an arc looking like a solar protuberance and producing a jet detectable several kilometers sideways from the brightest parts of the meteor head, and moving with velocities over 100 km/s. These jets are common features for the seven studied meteors. Precise position in trajectory, velocity and brightness at each point is available for all seven meteors, because of double-station records on 85 km base-line. When these meteoroids reached 130 km height, this diffuse structure of the radiation quickly transformed to usual meteor appearance resembling moving droplet, and a meteor train started to develop. These meteor phenomena above 130 km were not recognized before our observations, and they cannot be explained by standard ablation theory.
Betlem Hans
Jobse Klaas
Koten Pavel
Spurny Pavel
van't Leven Jaap
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