| Autor: |
George C. Papen, Xinzhao Chu, Alan Z. Liu, Chester S. Gardner, Michael C. Kelley, Robert Q. Fugate, Jack D. Drummond |
| Rok vydání: |
2000 |
| Předmět: |
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| Zdroj: |
Geophysical Research Letters. 27:1815-1818 |
| ISSN: |
0094-8276 |
| Popis: |
Seven persistent trails associated with bright reballs were probedwith asteerable Nawind/temperature lidar at Starre Optical Range, NM during the 17/18 Nov peak of the 1998 Leonid meteor shower. These chemilu- minescence trails were especially rich in Na. The average Na abundance within the trails was 52% of the background Na layer abundance, which suggests that the corresponding massesofthemeteorswerefrom1gupto1kg. CCDimages showthatthechemiluminescentemissions(includingNaand OH)areconnedtothewalls ofatube, whichexpandswith time by molecular diusion. Lidar proles within the trails show that the temperatures are highest at the edges of the tube where the airglow emissions are brightest. Approxi- mately 3 min after ablation, temperatures at the tube walls are 20{50 K warmer than the tube core and background at- mosphere. Neither chemical nor frictional heating provides a satisfactory explanation for the observations. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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