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

Valentic, T. A.; Avery, James; Avery, S. K.; Vincent, R. A.

doi:10.1029/96rs03308

Cited by 10 publications

(9 citation statements)

References 12 publications

(5 reference statements)

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“…Further we examine whether it is possible to fill gaps in the time series and generate a long continuous time series, ideally throughout the whole comparison period, that is suitable to study atmospheric patterns with periods between months and years. Similar comparisons have already been performed within the past few decades by Valentic et al (1997), Hocking et al (2001b), and Hall et al (2005) with smaller data sets and different locations. Their results showed particularly good agreement between MF and MR for alti-tudes between 75 and 85 km, but they indicate larger discrepancies at higher altitudes in the obtained winds.…”

Section: Introductionsupporting

confidence: 66%

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A comparison of 11-year mesospheric and lower thermospheric winds determined by meteor and MF radar at 69 ° N

2017

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Abstract. The Andenes Meteor Radar (MR) and the Saura Medium Frequency (MF) Radar are located in northern Norway (69 • N, 16 • E) and operate continuously to provide wind measurements of the mesosphere and lower thermosphere (MLT) region. We compare the two systems to find potential biases between the radars and combine the data from both systems to enhance altitudinal coverage between 60 and 110 km. The systems have altitudinal overlap between 78 and 100 km at which we compare winds and tides on the basis of hourly winds with 2 km altitude bins. Our results indicate reasonable agreement for the zonal and meridional wind components between 78 and 92 km. An exception to this is the altitude range below 84 km during the summer, at which the correlation decreases. We also compare semidiurnal and diurnal tides according to their amplitudes and phases with good agreement below 90 km for the diurnal and below 96 km for the semidiurnal tides.Based on these findings we have taken the MR data as a reference. By comparing the MF and MR winds within the overlapping region, we have empirically estimated correction factors to be applied to the MF winds. Existing gaps in that data set will be filled with weighted MF data. This weighting is done due to underestimated wind values of the MF compared to the MR, and the resulting correction factors fit to a polynomial function of second degree within the overlapping area. We are therefore able to construct a consistent and homogenous wind from approximately 60 to 110 km.

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Section: Introductionsupporting

confidence: 66%

“…The MR measures values around 35 m s −1 , whereas the MF shows lower values around 10 m s −1 . The systematic underestimation of the MF winds compared to MR winds was pointed out by other studies; e.g., Valentic et al (1997), Hocking and Thayaparan (1997), Hall et al (2005) and Singer et al (2008).…”

Section: Wind Comparison Between Radar Systemsmentioning

confidence: 49%

A comparison of 11-year mesospheric and lower thermospheric winds determined by meteor and MF radar at 69 ° N

2017

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“…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.…”

Section: Discussionmentioning

confidence: 56%

First results from the CAWSES-India Tidal Campaign

Gurubaran¹,

Rao

Ramkumar

et al. 2008

Ann. Geophys.

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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.

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“…The meteor trails roughly follow a Gaussian distribution with maximum near 92-94 km and fullwidth at half-maximum of ∼10 km. In the meteor technique, it is important to select the more short-lived characteristic "underdense" echoes for unambiguous inference of the wind field (Valentic et al, 1997). The meteor radar wind fields presented herein are based on winds derived from individual echoes averaged over 1 h and an estimated area of the order of 150 km×150 km (Nakamura et al, 1991(Nakamura et al, , 1997Hocking et al, 2001).…”

Section: Datamentioning

confidence: 99%

“…There exist a few co-located measurements by MF and meteor radars that provide some measure of consistency between the two techniques Hocking and Thayaparan, 1997;Thayaparan and Hocking, 2002;Valentic et al, 1997).…”

Section: Datamentioning

confidence: 99%

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

Forbes

Portnyagin²,

Skinner³

et al. 2004

Ann. Geophys.

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Abstract. Comparisons are made between climatological dynamic fields obtained from ground-based (GB) and spacebased (SB) instruments with a view towards identifying SB/GB intercalibration issuesE). We focus on monthly-mean prevailing, diurnal and semidiurnal wind components at 96 km, 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 valCorrespondence to: J. M. Forbes (forbes@colorado.edu) ues, 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 90 km. 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.

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

Cited by 10 publications

References 12 publications

A comparison of 11-year mesospheric and lower thermospheric winds determined by meteor and MF radar at 69 ° N

A comparison of 11-year mesospheric and lower thermospheric winds determined by meteor and MF radar at 69 ° N

First results from the CAWSES-India Tidal Campaign

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

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

Cited by 10 publications

References 12 publications

A comparison of 11-year mesospheric and lower thermospheric winds determined by meteor and MF radar at 69 ° N

A comparison of 11-year mesospheric and lower thermospheric winds determined by meteor and MF radar at 69 ° N

First results from the CAWSES-India Tidal Campaign

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

Contact Info

Product

Resources

About

A comparison of 11-year mesospheric and lower thermospheric winds determined by meteor and MF radar at 69 ° N

A comparison of 11-year mesospheric and lower thermospheric winds determined by meteor and MF radar at 69 ° N