Lidar observations of elevated temperatures in bright chemiluminescent meteor trails during the 1998 Leonid shower

Xinzhao Chu, Alan Z. Liu, George Papen, Chester S. Gardner, Michael Kelley, Jack Drummond, Robert Fugate

Research output: Contribution to journalArticle

Abstract

Seven persistent trails associated with bright fireballs were probed with a steerable Na wind/temperature lidar at Starfire Optical Range, NM during the 17/18 Nov peak of the 1998 Leonid meteor shower. These chemiluminescence 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 masses of the meteors were from 1 g up to 1 kg. CCD images show that the chemiluminescent emissions (including Na and OH) are confined to the walls of a tube, which expands with time by molecular diffusion. Lidar profiles within the trails show that the temperatures are highest at the edges of the tube where the airglow emissions are brightest. Approximately 3 min after ablation, temperatures at the tube walls are 20-50 K warmer than the tube core and background atmosphere. Neither chemical nor frictional heating provides a satisfactory explanation for the observations.

Original languageEnglish (US)
Pages (from-to)1815-1818
Number of pages4
JournalGeophysical Research Letters
Volume27
Issue number13
DOIs
StatePublished - Jul 1 2000

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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