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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 26, issue 12
Ann. Geophys., 26, 3783–3792, 2008
https://doi.org/10.5194/angeo-26-3783-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 26, 3783–3792, 2008
https://doi.org/10.5194/angeo-26-3783-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  27 Nov 2008

27 Nov 2008

Simultaneous observations of Polar Mesosphere Summer Echoes at two different latitudes in Antarctica

H. Nilsson1, S. Kirkwood1, R. J. Morris2, R. Latteck3, A. R. Klekociuk2, D. J. Murphy2, M. Zecha3, and E. Belova1 H. Nilsson et al.
  • 1Swedish Institute of Space Physics, Kiruna, Sweden
  • 2Australian Antarctic Division, Kingston, Tasmania, Australia
  • 3Leibniz-Institute of Atmospheric Physics, Kühlungsborn, Germany

Abstract. Simultaneous observations of Polar Mesosphere Summer Echoes (PMSE) at Wasa and Davis in Antarctica have been compared. Data with simultaneous observations were obtained for 16 days between 18 January and 5 February 2007. Wasa is at a higher geographic latitude than Davis, but at lower geomagnetic latitude. PMSE strength and occurrence frequency were significantly higher at Wasa. The variation of daily PMSE occurrence over the measurement period was in agreement with temperature and frost-point estimates from the Microwave Limb Sounder on the Aura spacecraft for both Wasa and Davis. The diurnal variation of PMSE strength and occurrence frequency as well as the shape of the altitude profiles of average PMSE strength and occurrence frequency were similar for the two sites. The deepest part of the evening minimum in PMSE occurrence frequency occurred for the same magnetic local time at the two sites rather than for the same local solar time. The study indicates that PMSE strength and occurrence increase between 68.6° and 73° geographic latitude, consistent with observed differences in mesospheric temperatures and water vapor content. The average altitude distribution of PMSE varies relatively little with latitude in the same hemisphere.

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