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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 12
Ann. Geophys., 18, 1599–1612, 2000
https://doi.org/10.1007/s00585-001-1599-8
© European Geosciences Union 2000
Ann. Geophys., 18, 1599–1612, 2000
https://doi.org/10.1007/s00585-001-1599-8
© European Geosciences Union 2000

  31 Dec 2000

31 Dec 2000

Frequency domain interferometry mode observations of PMSE using the EISCAT VHF radar

P. B. Chilson*,1, S. Kirkwood1, and I. Häggström2 P. B. Chilson et al.
  • 1MRI Atmospheric Research Programme, Swedish Institute of Space Physics, Box 812, S-981 28 Kiruna, Sweden
  • 2Swedish Institute of Space Physics, Box 812, S-981 28 Kiruna, Sweden
  • *Current affiliation: CIRES, University of Colorado/NOAA and NOAA Environmental Technology Laboratory, 325 Broadway, R/ET2, Boulder, CO, 80305-3328, USA e-mail: Phillip.Chilson@noaa.gov

Abstract. During the summer of 1997 investigations into the nature of polar mesosphere summer echoes (PMSE) were conducted using the European incoherent scatter (EISCAT) VHF radar in Norway. The radar was operated in a frequency domain interferometry (FDI) mode over a period of two weeks to study the frequency coherence of the returned radar signals. The operating frequencies of the radar were 224.0 and 224.6 MHz. We present the first results from the experiment by discussing two 4-h intervals of data collected over two consecutive nights. During the first of the two days an enhancement of the FDI coherence, which indicates the presence of distinct scattering layers, was found to follow the lower boundary of the PMSE. Indeed, it is not unusual to observe that the coherence values are peaked around the heights corresponding to both the lower- and upper-most boundaries of the PMSE layer and sublayers. A Kelvin-Helmholtz mechanism is offered as one possible explanation for the layering structure. Additionally, our analysis using range-time-pseudocolor plots of signal-to-noise ratios, spectrograms of Doppler velocity, and estimates of the positions of individual scattering layers is shown to be consistent with the proposition that upwardly propagating gravity waves can become steepened near the mesopause.

Key words: Ionosphere (polar ionosphere) · Meteorology and Atmospheric Dynamics (middle atmosphere dynamics) · Radio Science (Interferometry)

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