A comparison of winds measured by meteor radar systems and an MF radar at Buckland Park

Radio Science ◽  
1997 ◽  
Vol 32 (2) ◽  
pp. 867-874 ◽  
Author(s):  
T. A. Valentic ◽  
J. P. Avery ◽  
S. K. Avery ◽  
R. A. Vincent
Keyword(s):  
Meteor Radar ◽  
Radar Systems ◽  
Mf Radar

scholarly journals Signatures of mesospheric particles in ionospheric data

2009 ◽  
Vol 27 (2) ◽  
pp. 823-829 ◽  
Author(s):  
M. Friedrich ◽  
K. M. Torkar ◽  
W. Singer ◽  
I. Strelnikova ◽  
M. Rapp ◽  
...  
Keyword(s):  
Electron Density ◽  
Indirect Evidence ◽  
Meteor Radar ◽  
Sounding Rockets ◽  
Close Vicinity ◽  
Incoherent Scatter ◽  
Summer Echoes ◽  
In Situ Observations ◽  
Mf Radar

Abstract. The state of the ionosphere during the 2007 ECOMA/MASS campaign is described by in-situ observations by three sounding rockets launched from the Andøya Rocket Range and by ground based observations. The ground based measurements included the incoherent scatter radar EISCAT near Tromsø (both on UHF and VHF), as well as an MF radar, a meteor radar and an imaging riometer all located in the close vicinity of the rocket range. The pronounced electron density bite-outs seen by two of the rockets could not be detected from the ground, but the associated PMSE (Polar Mesospheric Summer Echoes) provide indirect evidence of pronounced perturbations of mesospheric electron densities.

scholarly journals Periodicities in energy dissipation rates in the auroral mesosphere/lower thermosphere

2003 ◽  
Vol 21 (3) ◽  
pp. 787-796 ◽  
Author(s):  
C. M. Hall ◽  
S. Nozawa ◽  
C. E. Meek ◽  
A. H. Manson ◽  
Y. Luo
Keyword(s):  
Energy Dissipation ◽  
Annual Variation ◽  
Middle Atmosphere ◽  
Lower Thermosphere ◽  
Radar Systems ◽  
Dissipation Rates ◽  
Semiannual Variation ◽  
Measuring Signal ◽  
Signal Fading ◽  
Mf Radar

Abstract. It is possible for medium-frequency (MF) radar systems to estimate kinetic energy dissipation rates by measuring signal fading times. Here, we present approximately 5 years of such results from Tromsø (69° N, 19° E) and in particular, investigate the periodicities present at different altitudes in the regime 80 to 100 km. We detect the known annual variation in the mesosphere and the semiannual variation on the lower thermosphere. In addition, other features are observed including terannual and ~ 27-day components in the lower thermosphere.Key words. Meteorology and atmospheric dynamics (climatology; middle atmosphere dynamics; turbulence)

scholarly journals Mesopause dynamics from the scandinavian triangle of radars within the PSMOS-DATAR Project

2004 ◽  
Vol 22 (2) ◽  
pp. 367-386 ◽  
Author(s):  
A. H. Manson ◽  
C. E. Meek ◽  
C. M. Hall ◽  
S. Nozawa ◽  
N. J. Mitchell ◽  
...  
Keyword(s):  
Large Scale ◽  
Middle Atmosphere ◽  
The Arctic ◽  
Small Scale ◽  
Wind Variability ◽  
Middle Latitudes ◽  
Radar Systems ◽  
Waves And Tides ◽  
Year 2000 ◽  
Mf Radar

Abstract. The "Scandinavian Triangle" is a unique trio of radars within the DATAR Project (Dynamics and Temperatures from the Arctic MLT (60–97km) region): Andenes MF radar (69°N, 16°E); Tromsø MF radar (70°N, 19°E) and Esrange "Meteor" radar (68°N, 21°E). The radar-spacings range from 125-270km, making it unique for studies of wind variability associated with small-scale waves, comparisons of large-scale waves measured over small spacings, and for comparisons of winds from different radar systems. As such it complements results from arrays having spacings of 25km and 500km that have been located near Saskatoon. Correlation analysis is used to demonstrate a speed bias (MF smaller than the Meteor) between the radar types, which varies with season and altitude. Annual climatologies for the year 2000 of mean winds, solar tides, planetary and gravity waves are presented, and show indications of significant spatial variability across the Triangle and of differences in wave characteristics from middle latitudes. Key words: Meteorology and atmospheric dynamics (middle atmosphere dynamics; waves and tides: instrument and techniques)

scholarly journals Mesospheric gravity wave momentum flux estimation using hybrid Doppler interferometry

2017 ◽  
Vol 35 (3) ◽  
pp. 733-750 ◽  
Author(s):  
Andrew J. Spargo ◽  
Iain M. Reid ◽  
Andrew D. MacKinnon ◽  
David A. Holdsworth
Keyword(s):  
Gravity Wave ◽  
Reynolds Stress ◽  
Momentum Flux ◽  
Meteor Radar ◽  
Stress Components ◽  
Vertical Beam ◽  
Flux Estimation ◽  
Radar Resolution ◽  
Using Data ◽  
Mf Radar

Abstract. Mesospheric gravity wave (GW) momentum flux estimates using data from multibeam Buckland Park MF radar (34.6° S, 138.5° E) experiments (conducted from July 1997 to June 1998) are presented. On transmission, five Doppler beams were symmetrically steered about the zenith (one zenith beam and four off-zenith beams in the cardinal directions). The received beams were analysed with hybrid Doppler interferometry (HDI) (Holdsworth and Reid, 1998), principally to determine the radial velocities of the effective scattering centres illuminated by the radar. The methodology of Thorsen et al. (1997), later re-introduced by Hocking (2005) and since extensively applied to meteor radar returns, was used to estimate components of Reynolds stress due to propagating GWs and/or turbulence in the radar resolution volume. Physically reasonable momentum flux estimates are derived from the Reynolds stress components, which are also verified using a simple radar model incorporating GW-induced wind perturbations. On the basis of these results, we recommend the intercomparison of momentum flux estimates between co-located meteor radars and vertical-beam interferometric MF radars. It is envisaged that such intercomparisons will assist with the clarification of recent concerns (e.g. Vincent et al., 2010) of the accuracy of the meteor radar technique.

scholarly journals Error analyses of a multistatic meteor radar system to obtain a three-dimensional spatial-resolution distribution

2021 ◽  
Vol 14 (5) ◽  
pp. 3973-3988
Author(s):  
Wei Zhong ◽  
Xianghui Xue ◽  
Wen Yi ◽  
Iain M. Reid ◽  
Tingdi Chen ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Measurement Errors ◽  
Dimensional Space ◽  
Lower Thermosphere ◽  
Three Dimensional ◽  
Radar System ◽  
Meteor Radar ◽  
Radar Systems ◽  
Good Spatial Resolution ◽  
First Time

Abstract. In recent years, the concept of multistatic meteor radar systems has attracted the attention of the atmospheric radar community, focusing on the mesosphere and lower thermosphere (MLT) region. Recently, there have been some notable experiments using such multistatic meteor radar systems. Good spatial resolution is vital for meteor radars because nearly all parameter inversion processes rely on the accurate location of the meteor trail specular point. It is timely then for a careful discussion focused on the error distribution of multistatic meteor radar systems. In this study, we discuss the measurement errors that affect the spatial resolution and obtain the spatial-resolution distribution in three-dimensional space for the first time. The spatial-resolution distribution can both help design a multistatic meteor radar system and improve the performance of existing radar systems. Moreover, the spatial-resolution distribution allows the accuracy of retrieved parameters such as the wind field to be determined.

scholarly journals Error analyses of a multistatic meteor radar system to obtain a 3-dimensional spatial resolution distribution

2020 ◽  
Author(s):  
Wei Zhong ◽  
Xianghui Xue ◽  
Wen Yi ◽  
Iain M. Reid ◽  
Tingdi Chen ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Measurement Errors ◽  
Dimensional Space ◽  
Lower Thermosphere ◽  
Radar System ◽  
Meteor Radar ◽  
3 Dimensional ◽  
Radar Systems ◽  
Good Spatial Resolution ◽  
First Time

Abstract. In recent years, the concept of multistatic meteor radar systems has attracted the attention of the atmospheric radar community, focusing on the mesosphere and lower thermosphere (MLT). Recently, there have been some notable experiments using multistatic meteor radar systems (Chau et al., 2019; Spargo et al., 2019; Stober and Chau, 2015; Stober et al., 2018). Good spatial resolution is vital for meteor radars because nearly all parameter inversion processes rely on the accurate location of the meteor trail reflecting points. It is timely then for a careful discussion focussed on the error distribution of multistatic meteor radar systems. In this study, we discuss the measurement errors that affect the spatial resolution and obtain the resolution distribution in 3-dimensional space for the first time. The spatial resolution distribution can both help design a multistatic meteor radar system and improve the performance of existing radar systems. Moreover, the spatial resolution distribution allows the accuracy of retrieved parameters such as the wind field to be determined.

scholarly journals Climatological lower thermosphere winds as seen by ground-based and space-based instruments

2004 ◽  
Vol 22 (6) ◽  
pp. 1931-1945 ◽  
Author(s):  
J. M. Forbes ◽  
Yu. I. Portnyagin ◽  
W. Skinner ◽  
R. A. Vincent ◽  
T. Solovjova ◽  
...  
Keyword(s):  
Lower Thermosphere ◽  
Meteor Radar ◽  
Hemispheric Differences ◽  
Phase Retardation ◽  
Meridional Component ◽  
Zonal Winds ◽  
Doppler Imager ◽  
Meridional Winds ◽  
Role Based ◽  
Mf Radar

Abstract. Comparisons are made between climatological dynamic fields obtained from ground-based (GB) and space-based (SB) instruments with a view towards identifying SB/GB intercalibration issues for TIMED and other future aeronomy satellite missions. SB measurements are made from the High Resolution Doppler Imager (HRDI) instrument on the Upper Atmosphere Research Satellite (UARS). The GB data originate from meteor radars at Obninsk, (55° N, 37° E), Shigaraki (35° N, 136° E) and Jakarta (6° S, 107° E) and MF spaced-antenna radars at Hawaii (22° N, 160° W), Christmas I. (2° N, 158° W) and Adelaide (35° S, 138° E). We focus on monthly-mean prevailing, diurnal and semidiurnal wind components at 96km, averaged over the 1991-1999 period. We perform space-based (SB) analyses for 90° longitude sectors including the GB sites, as well as for the zonal mean. Taking the monthly prevailing zonal winds from these stations as a whole, on average, SB zonal winds exceed GB determinations by ~63%, whereas meridional winds are in much better agreement. The origin of this discrepancy remains unknown, and should receive high priority in initial GB/SB comparisons during the TIMED mission. We perform detailed comparisons between monthly climatologies from Jakarta and the geographically conjugate sites of Shigaraki and Adelaide, including some analyses of interannual variations. SB prevailing, diurnal and semidiurnal tides exceed those measured over Jakarta by factors, on the average, of the order of 2.0, 1.6, 1.3, respectively, for the eastward wind, although much variability exists. For the meridional component, SB/GB ratios for the diurnal and semidiurnal tide are about 1.6 and 1.7. Prevailing and tidal amplitudes at Adelaide are significantly lower than SB values, whereas similar net differences do not occur at the conjugate Northern Hemisphere location of Shigaraki. Adelaide diurnal phases lag SB phases by several hours, but excellent agreement between the two data sources exists for semidiurnal tidal phases throughout the year. These results are consistent with phase retardation effects in the MF radar technique that are thought to exist above about 90km. Prevailing and tidal amplitudes from Shigaraki track year-to-year variations in SB fields, whereas in the Southern Hemisphere poorer agreement exists. The above hemispheric differences are due in part to MF vs. meteor radar techniques, but zonal asymmetries and day-to-day variability, combined with inadequate sampling, may also be playing a role. Based on these results, some obvious recommendations emerge that are relevant to combined GB/SB studies as part of TIMED and other future aeronomy missions.

scholarly journals An alternative explanation of PMSE-like scatter in MF radar data

2004 ◽  
Vol 22 (8) ◽  
pp. 2715-2722 ◽  
Author(s):  
G. O. L. Jones ◽  
M. A. Clilverd ◽  
P. J. Espy ◽  
S. Chew ◽  
D. C. Fritts ◽  
...  
Keyword(s):  
Radar Data ◽  
Wide Distribution ◽  
Lower Atmosphere ◽  
Data Sets ◽  
Wave Dynamics ◽  
Radar Systems ◽  
Long Duration ◽  
Summer Echoes ◽  
Two Peaks ◽  
Mf Radar

Abstract. There have been reports in the literature that spaced-antenna MF radars may provide a source of data on Polar Mesospheric Summer Echoes (PMSE). Even though the expected scatter from PMSE at MF frequencies is very much weaker than at VHF, the wide distribution of sites and long duration of data sets for MF radar systems could provide valuable information about the occurrence of PMSE. This paper tests whether there is any evidence of PMSE in the profiles derived using the MF radar at Rothera, Antarctica, one of the few such radars at high southern latitudes. Over a year of data during 1997/1998 has been analysed for the occurrence of persistent features around midday in the altitude range 60-95km. Criteria were chosen to test the likelihood that some of the narrow peaks in the power profiles were manifestations of electron density structures associated with PMSE. Although a small number of persistent features were seen at altitudes of 80-85km that are typically associated with PMSE, there was no seasonality in their occurrence. A detailed analysis of specific days showed that two peaks were often seen with altitude separations consistent with the vertical wavelength of the diurnal tide. Persistent features were also detected at altitudes of 70km and 90km during the winter months, thus showing a quite different seasonality to that of PMSE. An estimate of the turbulence caused by the breaking of gravity waves that have propagated up from the lower atmosphere shows that at Rothera significant energy is deposited near 80km during summer, and near 70 and 90km during winter. This seasonal variability is driven by the screening effect of stratospheric winds, and it appears that breaking gravity wave dynamics, rather than PMSE phenomena, can explain many of the localised altitude features in the MF radar data.

Sign in / Sign up

Export Citation Format

Share Document