[PDF] Top 20 Aspect sensitivity measurements of polar mesosphere summer echoes using coherent radar imaging
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Aspect sensitivity measurements of polar mesosphere summer echoes using coherent radar imaging
... We begin by estimating the scales of the wave oscillations found in the PMSE data revealed in Figs. 1 and 3. First, consider the downward phase propagation discussed above. Although difficult to quantify, we have ... See full document
11
Aspect sensitivity of polar mesosphere summer echoes based on ESRAD MST radar measurements in Kiruna, Sweden in 1997–2010
... of aspect sensitivity, ...PMSE aspect sensitivity measurements over the period 1997–2010 using the ESRAD MST radar located near Kiruna in Northern ...of aspect ... See full document
9
Enhancing the spatiotemporal features of polar mesosphere summer echoes using coherent MIMO and radar imaging at MAARSY
... In general, a critical point for PMSE imaging is the drifting nature of the echoes. PMSE correlation times are relatively short, and under stationary conditions, one would require a few minutes of ... See full document
15
Annales Geophysicae On the relationship between aspect sensitivity, wave activity, and multiple scattering centers of mesosphere summer echoes: a case study using coherent radar imaging
... of mesosphere summer echoes using coherent radar imaging 815 ...that aspect sen- sitivity was enhanced in the lower portion of the echo layer and decreased with ... See full document
11
Geometric considerations of polar mesospheric summer echoes in tilted beams using coherent radar imaging
... pects of PMSE have been studied with radars around 50 MHz since their first observation, in particular the spectral width (Czechowsky and Rüster, 1997; Blix, 1999) or aspect sen- sitivity (Röttger and Vincent, ... See full document
7
Finland HF and Esrange MST radar observations of polar mesosphere summer echoes
... range echoes, detected at 9, 11, 13 and 15 MHz with the Finland HF radar in summer, can be identified as PMSE at HF ...MST radar located at 650 km north of the HF radar ...upper ... See full document
9
Finland HF and Esrange MST radar observations of polar mesosphere summer echoes
... range echoes, detected at 9, 11, 13 and 15 MHz with the Finland HF radar in summer, can be identified as PMSE at HF ...MST radar located at 650 km north of the HF radar ...upper ... See full document
10
VHF radar measurements of momentum flux using summer polar mesopause echoes
... MF radar, located close to the for- mer position of the mobile SOUSY radar, and the VR83 approach, to measure momentum flux and who provide the mean for June ...fluxes using a nearby meteor ...in ... See full document
15
Occurrence of polar mesosphere summer echoes at very high latitudes
... of measurements with the vertical beam are ...known aspect sensitivity, as described in detail, ...21 coherent integrations – were combined to get a resulting time resolution of four ... See full document
12
Patches of polar mesospheric summer echoes characterized from radar imaging observations with MAARSY
... 3 Conclusions In this paper, we showed that PMSEs appear sometimes in horizontally contiguous areas, or patches, smaller than even 1 km, usually in patches with a few kilometres in diameter, and sporadically comparable ... See full document
11
Infrasound – the cause of strong Polar Mesosphere Winter Echoes?
... enhanced radar echoes from the mesosphere (Polar Mesosphere Winter Echoes – PMWE) during a solar proton event in November ...2004. Using the interferometric capabil- ities ... See full document
17
Characteristics of polar mesosphere summer echoes observed with oblique incidence HF radars at Syowa Station
... observed using vertical pointing beams because PMSE are strongest for the vertical beam with a very high aspect sensitivity; that is, scattering is much higher in the vertical direction than from ... See full document
17
ANGEO - Geomagnetic control of polar mesosphere summer echoes
... Contrary to the results with the ALOMAR SOUSY radar at 53.5 MHz during the years 1994±1997 present- ed here, Bremer et al. (1995) found a negative correla- tion between PMSE occurrence after EISCAT VHF ... See full document
7
Investigation of Polar Mesosphere Summer Echoes in Northern Scandinavia
... observations using the Esrange MST radar are ...wind measurements revealed terdiurnal, semidiurnal and diurnal ...the echoes is not determined by large scale wind shear producing turbulence, ... See full document
38
VHF radar and MF/HF dynasonde observations during Polar Mesosphere Summer Echoes conditions at EISCAT
... The mesosphere is a particular difficult region of the at- mosphere to be ...strong echoes from the summer mesopause at VHF band has led to a pronounced interest in radio scattering from the ...These ... See full document
8
Radar and modelling studies of polar mesospheric summer echoes
... Three rocket campaigns were carried out in conjunction with 3 radar campaigns in 1 983 ,19 87 and 1991. These experiments turned out to be extremely fruitful since they provided information on the background ... See full document
177
Similarities and differences in polar mesosphere summer echoes observed in the Arctic and Antarctica
... the radar frequency and the beam pointing ...the radar operation ...the radar operation frequency using assumptions about the frequency dependence of the cosmic noise temper- ...sampled ... See full document
12
Polar mesosphere summer echoes: a comparison of simultaneous observations at three wavelengths
... under summer meso- sphere conditions is expected to be negligibly small (Kirk- wood and Osepian, ...calculated using the electron density above and below the PMSE layer (as given by stan- dard EISCAT data ... See full document
10
Polar mesosphere summer echoes during the July 2000 solar protonevent
... on Polar Mesosphere Summer Echoes (PMSE) is ...MST Radar (ESRAD) at 67 ◦ 53 0 N, 21 ◦ 06 0 E. The 30 MHz Imaging Riometer for Ionospheric Studies IRIS in Kilpisj¨arvi (69 ◦ 30 0 ... See full document
14
Polar mesosphere summer echoes (PMSE): review of observations and current understanding
... observed aspect sensitivities ...low aspect sensitivities at the top 15 of the PMSE layers are understandable in the scope of enhanced turbulent activity at these ... See full document
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