scholarly journals On the radar frequency dependence of polar mesosphere summer echoes

2020 ◽  
Vol 4 (6) ◽  
pp. 1-8
Author(s):  
ShuCan Ge ◽  
◽  
HaiLong Li ◽  
Lin Meng ◽  
MaoYan Wang ◽  
...  
Keyword(s):  
Frequency Dependence ◽  
Summer Echoes ◽  
Polar Mesosphere Summer Echoes ◽  
Radar Frequency

scholarly journals Studies of polar mesosphere summer echoes by VHF radar and rocket probes

1994 ◽  
Vol 14 (9) ◽  
pp. 139-148 ◽  
Author(s):  
U.-P. Hoppe ◽  
T.A. Blix ◽  
E.V. Thrane ◽  
F.-J. Lübken ◽  
J.Y.N. Cho ◽  
...  
Keyword(s):  
Vhf Radar ◽  
Summer Echoes ◽  
Polar Mesosphere Summer Echoes

Using polar mesosphere summer echoes and stratospheric/mesospheric winds to explain summer mesopause jumps in Antarctica

2017 ◽  
Vol 162 ◽  
pp. 106-115 ◽  
Author(s):  
Franz-Josef Lübken ◽  
Ralph Latteck ◽  
Erich Becker ◽  
Josef Höffner ◽  
Damian Murphy
Keyword(s):  
Summer Echoes ◽  
Polar Mesosphere Summer Echoes

scholarly journals Imaging of Polar Mesosphere Summer Echoes with the 450 MHz Poker Flat Advanced Modular Incoherent Scatter Radar

2007 ◽  
Vol 34 (20) ◽  
Author(s):  
M. J. Nicolls ◽  
C. J. Heinselman ◽  
E. A. Hope ◽  
S. Ranjan ◽  
M. C. Kelley ◽  
...  
Keyword(s):  
Incoherent Scatter Radar ◽  
Incoherent Scatter ◽  
Scatter Radar ◽  
Summer Echoes ◽  
Polar Mesosphere Summer Echoes

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

2008 ◽  
Vol 26 (9) ◽  
pp. 2795-2806 ◽  
Author(s):  
R. Latteck ◽  
W. Singer ◽  
R. J. Morris ◽  
W. K. Hocking ◽  
D. J. Murphy ◽  
...  
Keyword(s):  
Noise Source ◽  
Late Summer ◽  
The Arctic ◽  
Occurrence Rate ◽  
Height Distribution ◽  
Summer Echoes ◽  
Polar Mesosphere Summer Echoes ◽  
The Mean ◽  
Resolute Bay ◽  
Highly Correlated

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.

scholarly journals Polar mesosphere summer echoes: a comparison of simultaneous observations at three wavelengths

2007 ◽  
Vol 25 (12) ◽  
pp. 2487-2496 ◽  
Author(s):  
E. Belova ◽  
P. Dalin ◽  
S. Kirkwood
Keyword(s):  
Short Interval ◽  
Beam Width ◽  
Turbulent Energy ◽  
Energy Dissipation Rate ◽  
Theory Model ◽  
Turbulence Theory ◽  
Vhf Radar ◽  
Summer Echoes ◽  
Polar Mesosphere Summer Echoes ◽  
Uhf Radar

Abstract. On 5 July 2005, simultaneous observations of Polar Mesosphere Summer Echoes (PMSE) were made using the EISCAT VHF (224 MHz) and UHF (933 MHz) radars located near Tromsø, Norway and the ALWIN VHF radar (53.5 MHz) situated on Andøya, 120 km SW of the EISCAT site. During the short interval from 12:20 UT until 12:26 UT strong echoes at about 84 km altitude were detected with all three radars. The radar volume reflectivities were found to be 4×10−13 m−1, 1.5×10−14 m−1 and 1.5×10−18 m−1 for the ALWIN, EISCAT-VHF and UHF radars, respectively. We have calculated the reflectivity ratios for each pair of radars and have compared them to ratios obtained from the turbulence-theory model proposed by Hill (1978a). We have tested different values of the turbulent energy dissipation rate ε and Schmidt number Sc, which are free parameters in the model, to try to fit theoretical reflectivity ratios to the experimental ones. No single combination of the parameters ε and Sc could be found to give a good fit. Spectral widths for the EISCAT radars were estimated from the spectra computed from the autocorrelation functions obtained in the experiment. After correction for beam-width broadening, the spectral widths are about 4 m/s for the EISCAT-VHF and 1.5–2 m/s for the UHF radar. However, according to the turbulence theory, the spectral widths in m/s should be the same for both radars. We also tested an incoherent scatter (IS) model developed by Cho et al. (1998), which takes into account the presence of charged aerosols/dust at the summer mesopause. It required very different sizes of particles for the EISCAT-VHF and UHF cases, to be able to fit the experimental spectra with model spectra. This implies that the IS model cannot explain PMSE spectra, at least not for monodisperse distributions of particles.

A statistical study of polar mesosphere summer echoes observed by EISCAT

1996 ◽  
Vol 58 (1-4) ◽  
pp. 307-315 ◽  
Author(s):  
J.R. Palmer ◽  
H. Rishbeth ◽  
G.O.L. Jones ◽  
P.J.S. Williams
Keyword(s):  
Statistical Study ◽  
Summer Echoes ◽  
Polar Mesosphere Summer Echoes

Preliminary Study on Active Modulation of Polar Mesosphere Summer Echoes with the Radio Propagation in Layered Space Dusty Plasma

2016 ◽  
Vol 18 (6) ◽  
pp. 607-610 ◽  
Author(s):  
Shengguo Zhou ◽  
Hailong Li ◽  
Luyao Fu ◽  
Maoyan Wang
Keyword(s):  
Dusty Plasma ◽  
Radio Propagation ◽  
Summer Echoes ◽  
Polar Mesosphere Summer Echoes ◽  
Preliminary Study
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