First polar mesosphere summer echoes observed at Davis, Antarctica (68.6°S)

Morris, R. J.; Murphy, D. J.; Reid, Iain M.; Holdsworth, David A.; Vincent, R. A.

doi:10.1029/2004gl020352

Cited by 44 publications

(66 citation statements)

References 14 publications

(32 reference statements)

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“…It seems possible that the weak SH PMSE observations could have been due to too low latitude, but it remains unclear whether the problem is related to geographic or to geomagnetic latitude. In 2003, a VHF radar was installed at Davis, Antarctica (68.6°S, geomagnetic latitude 74.4°S) and similar PMSE to those seen in the Arctic were reported [Morris et al, 2004[Morris et al, , 2006. PMSE at HF were also observed from Halley (76°S, 27°W) in early 2004, with qualitatively similar characteristics to NH PMSE at VHF [Jarvis et al, 2005].…”

Section: Introductionmentioning

confidence: 63%

Polar mesosphere summer echoes at Wasa, Antarctica (73°S): First observations and comparison with 68°N

Kirkwood

Wolf

Nilsson

et al. 2007

Geophysical Research Letters

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Section: Introductionmentioning

confidence: 63%

Polar mesosphere summer echoes at Wasa, Antarctica (73°S): First observations and comparison with 68°N

Kirkwood

Wolf

Nilsson

et al. 2007

Geophysical Research Letters

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“…Woodman and Guillen, 1974;Czechowsky et al, 1979;Ecklund and Balsley, 1981;Reid, 1990;Morris et al, 2004;Kirkwood et al, 2007;Smirnova et al, 2010). During the last three decades scientific interest has concentrated on strong radar returns from the mesopause region (80-90 km altitudes) observed in the summer months at polar latitudes, which have been termed polar mesosphere summer echoes (PMSE).…”

Section: Introductionmentioning

confidence: 99%

Spectral characteristics and scatter cross-section of low latitude mesospheric echoes measured by the Indian MST radar at Gadanki

et al. 2012

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Abstract. In November 2008 and in March and April 2009the Indian MST radar (53 MHz) at Gadanki was operated during the daytime in a special experiment, with 600 m altitude resolution, for understanding the characteristics of lowlatitude mesospheric echoes (LLME). The data of three days when the echoes were strongest have been analysed in terms of spectral widths and radar volume reflectivities. Spectral widths of LLME show some decrease with altitude, with median values of 4-6 m s −1 at 69-72 km and of 2-4 m s −1 at 73-78 km. This corresponds to 20-200 mW kg −1 turbulent energy dissipation rates. It has been shown that stronger echoes have broader spectra consistent with a turbulent scattering mechanism. For the first time, the volume reflectivities for the strong LLME for Gadanki have also been calculated. They are in the range of 10 −17 -10 −15 m −1 , so LLME at Gadanki are somewhat stronger than those reported so far from Jicamarca, Peru (Lehmacher et al., 2009).

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“…However, Lübken et al (1999) showed on the basis of in situ measurements that there is no significant difference in the polar mesopause temperature between both hemispheres. Morris et al (2004) presented the first morphology of daily and seasonal occurrence of SH-PMSE based on VHF radar observation at Davis during austral summer of 2003/2004. They concluded that SH PMSE observed at 68.6 • S exhibit similar characteristics to published observations (i.e.…”

Section: Introductionmentioning

confidence: 99%

Similarities and differences in polar mesosphere summer echoes observed in the Arctic and Antarctica

et al. 2008

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Abstract. Polar Mesosphere Summer Echoes (PMSE) have been observed in the high latitudes of the Northern and Southern Hemisphere for several years using VHF radars located at Andenes/Norway (69 • N, 16 • E), Resolute Bay/Canada (75 • N, 95 • W), and Davis/Antarctica (69 • S, 78 • E). The VHF radars at the three sites were calibrated using the same methods (noise source and delayed transmitting signal) and identical equipment. Volume reflectivity was derived from the calibrated echo power and the characteristics of the seasonal variation of PMSE were estimated at the sites for the years 2004 to 2007. The largest peak volume reflectivity of about 2×10 −9 m −1 was observed at Andenes compared with their counterparts at Davis (∼4×10 −11 m −1 ) and Resolute Bay (∼6×10 −12 m −1 ). The peak of the PMSE height distribution is 85.6 km at Davis which is about 1 km higher than at Andenes. At Resolute Bay the height distribution peaks at about 85 km but only a few layers were found below 84 km. The mean PMSE occurrence rate is 83% at Andenes, 38% at Davis with larger variability and only 18% at Resolute Bay (in late summer). The duration of the PMSE season varies at Andenes from 104 to 113 days and at Davis from 88 to 93 days. In general the PMSE seasons starts about 5 days later at Davis and ends about 10 days earlier compared to Andenes. In all three seasons the PMSE occurrence suddenly drops to a much lower level at Davis about 32 days after solstice whereas the PMSE season decays smoothly at Andenes. The duration of the PMSE season at Andenes and Davis is highly correlated with the presence of equatorward directed winds, the observed differences in PMSE occurrence are related to the mesospheric temperatures at both sites.

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First polar mesosphere summer echoes observed at Davis, Antarctica (68.6°S)

Cited by 44 publications

References 14 publications

Polar mesosphere summer echoes at Wasa, Antarctica (73°S): First observations and comparison with 68°N

Polar mesosphere summer echoes at Wasa, Antarctica (73°S): First observations and comparison with 68°N

Spectral characteristics and scatter cross-section of low latitude mesospheric echoes measured by the Indian MST radar at Gadanki

Similarities and differences in polar mesosphere summer echoes observed in the Arctic and Antarctica

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