Cupri observations of PMSE during Salvo C of NLC‐91: Evidence of a depressed mesopause temperature

Clark A. Miller, Wesley E. Swartz, John Y.N. Cho

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

The Cornell University Portable Radar Interferometer (CUPRI) observed two extremely strong layers of Polar Mesosphere Summer Mesosphere (PMSE) thirty minutes prior to the launch of Salvo C of the NLC‐91 campaign. The lower layer exhibited a S/N ratio of 42 dB (the second strongest event of NLC‐91), vertical velocities of a few m/s, and a narrow spectral width, suggesting that it was the result of partial reflections. The upper layer, in contrast, exhibited sinusoidal structures in vertical velocity with peak amplitudes greater than ± 10 m/s and wide spectral widths. These structures were observed to grow and steepen with altitude until they broke and produced turbulent radar scattering. We conclude that the rapid rate of growth of the wave with altitude was the result of a depressed mesopause temperature and a nearly adiabatic temperature gradient at PMSE heights and that the simultaneous measurement of both a low mesopause temperature and strong PMSE supports recent theories that find the presence of charged aerosols to be the key to the unique radar cross sections associated with PMSE.

Original languageEnglish (US)
Pages (from-to)2295-2298
Number of pages4
JournalGeophysical Research Letters
Volume20
Issue number20
DOIs
StatePublished - Oct 22 1993
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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