NDLI: Characteristics of fe ablation trials observed during the 1998 leonid meteor shower

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Characteristics of fe ablation trials observed during the 1998 leonid meteor shower

Content Provider	NASA Technical Reports Server (NTRS)
Author	Swenson, Gary Gardner, Chester S. Chu, Xin-Zhao Pan, Wei-Lin Papen, George Jenniskens, Peter
Copyright Year	2000
Description	Eighteen Fe ablation trails were observed during the 17/18 Nov 1998 Leonid meteor shower with an airborne Fe lidar aboard the National Simulation Facility/National Center for Atmospheric Research (NSF/NCAR) Electra aircraft over Okinawa. The average altitude of the 18 trails from the high velocity (72 km/s) Leonid meteors, 95.67 +/- 0.93 km, is approximately 6.7 km higher than previously observed for slower (approx. 30 km/s) sporadic meteors. This height difference is consistent with the assumption that meteors ablate when the kinetic energy imparted to the atmosphere reaches a critical threshold. The average age of the Fe trails, determined by a diffusion model, is 10.1 min. The youngest ages were observed below 92 km and above 98 km where chemistry and diffusion dominate, respectively. The average abundance of the trails is ten percent of the abundance of the background Fe layer. Observations suggest that the 1998 Leonid shower did not have a significant impact on the abundance of the background Fe layer.
File Size	378664
File Format	PDF
Language	English
Publisher Date	2000-01-01
Access Restriction	Open
Subject Keyword	Astrophysics Airborne Equipment Meteor Trails Meteoroid Showers Iron Meteorites Iron Leonid Meteoroids Diffusion Ablation Optical Radar Electra Aircraft Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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