Further direct comparisons of incoherent scatter and medium frequency radar winds from AIDA '89

Turek, R.S.; Roper, R. G.; Brosnahan, J. W.

doi:10.1016/s1364-6826(97)00089-8

Cited by 13 publications

(8 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cervera and Reid, 1995;Valentic et al, 1997). Applying the spaced antenna full correlation analysis to the data obtained by the Imaging Doppler interferometer, Turek et al (1998) found an overall agreement with the winds derived from the incoherent scatter radar at Arecibo during the AIDA '89 campaign. A noticeable discrepancy, however, was found in the meridional winds, with speeds differing up to 50 m/s.…”

Section: Discussionsupporting

confidence: 60%

First results from the CAWSES-India Tidal Campaign

Gurubaran¹,

Rao

Ramkumar

et al. 2008

Ann. Geophys.

View full text Add to dashboard Cite

Abstract. The first CAWSES-India Tidal Campaign was conducted by the Indian scientific community during MarchApril 2006. The objectives of this campaign were: (1) To determine the characteristics of tides in the troposphere and lower stratosphere (0-20 km) and mesosphere and lower thermosphere (MLT) region (80-100 km), (2) to explore and identify what lower atmospheric processes drive middle atmospheric tides in the Indian continental region and (3) to provide information on those short-term variabilities of MLT tides that are likely to have an impact on the ionospheric variabilities and contribute to the upper atmospheric weather. Data sets from experiments conducted at the three low latitude radar sites, namely, Trivandrum (8.5 • N, 76.9 • E), Tirunelveli (8.7 • N, 77.8 • E) and Gadanki (13.5 • N, 79.2 • E) and fortnightly rocket launches from Thumba were made use of in this study. An important observational finding reported in this work is that the radar observations at Tirunelveli/Trivandrum indicate the presence of 15-20 day modulation of diurnal tide activity at MLT heights during the February-March period. A similar variation in the OLR fields in the western Pacific (120-160 • longitude region) suggests a possible link between the observed tidal variabilities and the variations in the deep tropical convection through the nonmigrating tides it generates.

show abstract

Section: Discussionsupporting

confidence: 60%

First results from the CAWSES-India Tidal Campaign

Gurubaran¹,

Rao

Ramkumar

et al. 2008

Ann. Geophys.

View full text Add to dashboard Cite

show abstract

“…Franke et al, 1990;Meek and Manson, 1987;Brown et al, 1995;Turek et al, 1995Turek et al, , 1998, while the ESP alignment showed similar agreement to that of Vandepeer and Reid (1995a) between 70 and 84 km. Despite this agreement Holdsworth and Reid (1995b) were careful not to suggest that the volume scatter was applicable experimentally, or that the interferometric techniques would fail experimentally.…”

Section: Imaging Doppler Interferometry and The Volume Scatter Situationmentioning

confidence: 52%

“…Despite this agreement Holdsworth and Reid (1995b) were careful not to suggest that the volume scatter was applicable experimentally, or that the interferometric techniques would fail experimentally. However, Roper and Brosnahan (1997) and Turek et al (1998) appear to have interpreted the results as implying otherwise. Quoting verbatim from both: " Holdsworth and Reid (1995b) were unable to recover the actual scatterer positions and concluded that the scatterers identified by the IDI technique were fictitious."…”

Section: Imaging Doppler Interferometry and The Volume Scatter Situationmentioning

confidence: 85%

“…If this was the case the actual scatterer positions would not have been recovered for a smaller number of scatterers. A further misinterpretation of the volume scatter predictions made by Turek et al (1998) relates to their observation of a random distribution of ESPs at heights below 84 km, and evidence of a preferred azimuth of ESPs above 84 km. The preferred azimuth above 84 km was observed to not be aligned with the IDI wind direction, leading the authors to conclude that they did not find evidence of ESP alignment along the volume scatter predicted preferred azimuth.…”

Section: Imaging Doppler Interferometry and The Volume Scatter Situationmentioning

confidence: 99%

See 1 more Smart Citation

Comparisons of full correlation analysis (FCA) and imaging Doppler interferometry (IDI) winds using the Buckland Park MF radar

Holdsworth

2004

Ann. Geophys.

View full text Add to dashboard Cite

Abstract. We present results from three years of mesospheric and thermospheric wind measurements obtained using full correlation analysis (FCA) and imaging Doppler interferometry (IDI) for the Buckland Park MF radar. The IDI winds show excellent agreement with the FCA winds, both for short (2-min) and longer term (hourly, fortnightly) comparisons. An extension to a commonly used statistical analysis technique is introduced to show that the IDI winds are approximately 10% larger than the FCA winds, which we attribute to an underestimation of the FCA winds rather than an indication that IDI overestimates the wind velocity. Although the distribution of IDI effective scattering positions are shown to be consistent with volume scatter predictions, the velocity comparisons contradict volume scatter predictions that the IDI velocity will be overestimated. However, reanalysis of a 14-day data set suggests the lack of overestimation is due to the radial velocity threshold used in the analysis, and that removal of this threshold produces the volume scatter predicted overestimation of the IDI velocities. The merits of using hourly IDI estimates versus hourly averaged 2-min IDI estimates are presented, suggesting that hourly estimated turbulent velocities are overestimated.

show abstract

“…Typically the IDI is seen to generate somewhat weaker winds than comparable techniques. Turek et al (1998) compared IDI winds between 70 and 100 km altitude with a co-located incoherent scatter radar from Arecibo for a 2 h period on 10 April 1989. Whereas previously Hines et al (1993) had questioned the reliability of the IDI winds in this data set above 80 km altitude, they found good agreement between the two techniques except in the region of maximum wind shear above 90 km where the meridional winds were seen to be much weaker in the IDI derived winds, an effect ascribed to interference from gravity waves preferentially propagating in the north-south direction.…”

Section: Discussionmentioning

confidence: 99%

A long-term comparison of wind and tide measurements in the upper mesosphere recorded with an imaging Doppler interferometer and SuperDARN radar at Halley, Antarctica

Hibbins

Jarvis

2008

Atmos. Chem. Phys.

View full text Add to dashboard Cite

Abstract. Data from a near co-located imaging Doppler interferometer (IDI) and SuperDARN radar recorded since 1996 have been analysed in a consistent manner to compare the derived mean winds and tides in the upper mesosphere. By comparing only days when both techniques were recording good quality meridional wind data it is shown that the SuperDARN radar winds and tides correlate best with the IDI height bin 90-95 km. On timescales of one hour the winds derived from the IDI have a much greater associated variance and correlate poorly with the SuperDARN winds. Regression analysis reveals that the observed SuperDARN daily mean meridional wind strength is approximately 65% that recorded by the IDI, in good quantitative agreement with previous studies which have shown contamination to Super-DARN derived winds due to the significant back lobe of the radar radiation pattern. Climatologically the two techniques observe similar monthly mean winds with the Super-DARN meridional winds suppressed compared to the IDI which tends to record winds more poleward than those derived by the SuperDARN radar during the summer months, and to be slightly more equatorward during the winter. The 12-h tidal amplitude and phase derived from both techniques are in good agreement, whereas the 24-h tides are seen much more strongly in the SuperDARN radar, especially in wintertime, with poor phase agreement. Long term comparison of the two techniques reveals a tendency for the IDI meridional winds to be more poleward during solar maximum especially during summer time; an effect which is not reproduced in the meridional winds derived from the SuperDARN radar. These results are discussed in the context of previous studies to independently determine the veracity of each technique, and to highlight the circumstances where data derived Correspondence to: R. E. Hibbins (rehi@bas.ac.uk) from these two techniques can be used to draw reliable conclusions from comparative studies based on geographically distributed pairs of instruments.

show abstract

Further direct comparisons of incoherent scatter and medium frequency radar winds from AIDA '89

Cited by 13 publications

References 15 publications

First results from the CAWSES-India Tidal Campaign

First results from the CAWSES-India Tidal Campaign

Comparisons of full correlation analysis (FCA) and imaging Doppler interferometry (IDI) winds using the Buckland Park MF radar

A long-term comparison of wind and tide measurements in the upper mesosphere recorded with an imaging Doppler interferometer and SuperDARN radar at Halley, Antarctica

Contact Info

Product

Resources

About