Preprints
https://doi.org/10.5194/angeo-2023-19
https://doi.org/10.5194/angeo-2023-19
17 Aug 2023
 | 17 Aug 2023
Status: a revised version of this preprint was accepted for the journal ANGEO and is expected to appear here in due course.

Climatological comparison of polar mesosphere summer echoes over the Arctic and Antarctica at 69°

Ralph Latteck and Damian J. Murphy

Abstract. Polar Mesosphere Summer Echoes (PMSE) have been observed for more than 30 years with 50-MHz VHF radars at various locations in the Northern Hemisphere. Continuous observations of PMSE are conducted on the northern Norwegian island of Andøya (69.3° N) using the ALWIN radar (1999–2008) and MAARSY (since 2010). The same kind of PMSE measurements began in 2004 in the southern hemisphere with the Australian Antarctic Division’s VHF radar at Davis Station in Antarctica (68.6° S), which is at an opposite latitude to Andøya. Since the radars at both sites are calibrated, the received echo strength of PMSE from more than one decade of mesospheric observations on both hemispheres could be converted to absolute signal power, allowing a direct comparison of the measurements. Comparison of PMSE observations obtained at both radar sites during a period of 23 boreal summers (Andøya) and 15 Austral summers (Davis) shows that their PMSE signal strengths are of the same order of magnitude but significantly less PMSE is observed in the southern hemisphere than in the northern hemisphere. Compared to Andøya, the PMSE season over Davis starts about 7 days later on average and ends 8 days earlier, making it 15 days shorter. PMSE over Davis occur less frequently but with greater variability in seasonal, diurnal, and altitudinal occurrence. For example, PMSE over Davis reach maximum altitudes about 1.5 km higher than those over Andøya.

Ralph Latteck and Damian J. Murphy

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on angeo-2023-19', Anonymous Referee #1, 13 Sep 2023
  • RC2: 'Comment on angeo-2023-19', Anonymous Referee #2, 11 Oct 2023
    • AC2: 'Reply on RC2', Ralph Latteck, 16 Oct 2023
  • RC3: 'Comment on angeo-2023-19', Anonymous Referee #3, 07 Nov 2023
    • AC3: 'Reply on RC3', Ralph Latteck, 14 Nov 2023
  • RC4: 'Comment on angeo-2023-19', Anonymous Referee #4, 10 Nov 2023

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on angeo-2023-19', Anonymous Referee #1, 13 Sep 2023
  • RC2: 'Comment on angeo-2023-19', Anonymous Referee #2, 11 Oct 2023
    • AC2: 'Reply on RC2', Ralph Latteck, 16 Oct 2023
  • RC3: 'Comment on angeo-2023-19', Anonymous Referee #3, 07 Nov 2023
    • AC3: 'Reply on RC3', Ralph Latteck, 14 Nov 2023
  • RC4: 'Comment on angeo-2023-19', Anonymous Referee #4, 10 Nov 2023
Ralph Latteck and Damian J. Murphy
Ralph Latteck and Damian J. Murphy

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Short summary
This paper gives an overview of continuous measurements of PMSE made with VHF radars at Andøya (69° N) and at Davis (69° S). PMSE signal strengths are of the same order of magnitude but significantly less PMSE was observed in the southern hemisphere than in the northern hemisphere. Compared to Andøya, the PMSE season over Davis starts about 7 days later and ends 8 days earlier, PMSE occur less frequently but with greater variability in seasonal and diurnal occurrence reaching higher peak altitude.