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Fresnel transform meteor speed estimation is … investigated. A spectral based technique is developed allowing the transform to be applied at low temporal sampling rates. Simulations are used to compare meteoroid … speeds determined using the Fresnel transform and alternative techniques…
This paper presents the meteor temperatures estimated using two radars installed … in Davis (69 deg S, 78 deg E), Antarctica. The Davis MST radar was installed in … February 2003, primarily for observation of polar mesosphere summer echoes…
This paper presents the meteor observations using two radars installed in Davis (69 … deg S, 78 deg E), Antarctica. The Davis MST radar was installed in February 2003, primarily for observation of polar mesosphere summer echoes…
The existence of Polar Mesosphere Summer Echoes (PMSE) in the Southern … Hemisphere (SH) has been confirmed using MST radar, HF radar and a Dynasonde. Studies spanned the geographic latitudes 62.1°S (Machu Picchu), 68.6°S (Davis), 69.0°S (Syowa), and 75.5°S (Halley Bay).
Mesosphere Summer Echoes (MSE) have been observed with 50-MHz VHF … radars at middle (MSE) and polar latitudes (PMSE) in the Northern Hemisphere for … more than 20 years. However measurements in the Southern Hemisphere were in the … past rare and limited to low southern latitudes.
A function that approximates atmospheric tidal behavior in the polar regions is … described.
The amplitude and phase of the semidiurnal tide in the mesosphere and … lower thermosphere above Davis varies through the summer months. In particular, the phase can oscillate around a fixed value or, at some heights, shift by a whole cycle of local time.
The existence of Polar Mesosphere Summer Echoes (PMSE) in the Southern Hemisphere … (SH) has recently been confirmed using HF radar (Ogawa et al., 2002), MST … radar (Morris et al., 2004), and a Dynasonde (Jarvis et al., 2005) following earlier … observations using MST radar (Woodman et al., 1999).
The international cooperation that makes Antarctica a continent for science has enabled … observations of the Antarctic middle atmosphere that are not possible anywhere else on … Earth. Atmospheric radars operated by Australia (Davis), Japan (Syowa), the UK and the … USA (Rothera)…
The atmospheric tides are a dominant and persistent feature of the mesosphere and lowerthermosphere … region of the atmosphere which spans from 80 to 120km above the Earth’s … surface. The tides…
Considerable debate is ongoing as to whether there is a temperature difference between the … northern and southern hemisphere polar mesopause regions of the atmosphere. In part this … debate has been fuelled by the reported lack of southern hemisphere Polar Mesosphere … Summer Echoes (PMSE)…
Polar Mesosphere Summer Echoes (PMSE) were detected above the high-latitude station Davis, Antarctica (68.61S) using a 55MHz atmospheric radar during the 2003–2004 austral summer. In this paper…
[1] We report on novel spectral characteristics of E-region … backscatter acquired using a 1.94 MHz Medium Frequency … (MF) radar above the high-latitude Antarctic station Davis … (68.6ºS). Two distinctive Doppler spectra are observed: one … that exhibits bifurcation in Doppler velocity…