A comparison of partial reflection drifts with winds determined by rocket techniques—1

Vincent, R. A.; Stubbs, T. J.; Pearson, P.H.O.; Lloyd, KH; Low, C.H.

doi:10.1016/0021-9169(77)90144-1

Cited by 44 publications

(11 citation statements)

References 15 publications

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“…They showed that the spaced antenna winds agreed well with meteor radar measurements of winds in the 80–100 km region and concluded that the partial reflection experiment was capable of measuring the neutral air motion in the MLT region. Vincent et al [1977] compared partial reflection drifts with winds determined by rocket techniques, which also showed a good agreement. Using MU radar, Van Baelen et al [1990] compared Doppler beam swinging and spaced antenna observations and shown the consistency of the two techniques.…”

Section: Introductionmentioning

confidence: 76%

Initial results from SKiYMET meteor radar at Thumba (8.5°N, 77°E): 1. Comparison of wind measurements with MF spaced antenna radar system

2007

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[1] In the present communication, initial results from the allSKy interferometric METeor (SKiYMET) radar installed at Thumba (8.5°N, 77°E) are presented. The meteor radar system provides hourly zonal and meridional winds in the mesosphere lower thermosphere (MLT) region. The meteor radar measured zonal and meridional winds are compared with nearby MF radar at Tirunalveli (8.7°N, 77.8°E). The present study provided an opportunity to compare the winds measured by the two different techniques, namely, interferometry and spaced antenna drift methods. Simultaneous wind measurements for a total number of 273 days during September 2004 to May 2005 are compared. The comparison showed a very good agreement between these two techniques in the height region 82-90 km and poor agreement above this height region. In general, the zonal winds compare very well as compared to the meridional winds. The observed discrepancies in the wind comparison above 90 km are discussed in the light of existing limitations of both the radars. The detailed analysis revealed the consistency of the measured winds by both the techniques. However, the discrepancies are observed at higher altitudes and are attributed to the contamination of MF radar neutral wind measurements with Equatorial Electro Jet (EEJ) induced inospheric drifts rather than the limitations of the spaced antenna technique. The comparison of diurnal variation of zonal winds above 90 km measured by both the radars is in reasonably good agreement in the absence of EEJ (during local nighttime). It is also been noted that the difference in the zonal wind measurements by both the radars is directly related to the strength of EEJ, which is a noteworthy result from the present study.Citation: Kumar, K. K., G. Rankumar, and S. T. Shelbi (2007), Initial results from SKiYMET meteor radar at Thumba (8.5°N, 77°E): 1. Comparison of wind measurements with MF spaced antenna radar system, Radio Sci., 42, RS6008,

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Section: Introductionmentioning

confidence: 76%

Initial results from SKiYMET meteor radar at Thumba (8.5°N, 77°E): 1. Comparison of wind measurements with MF spaced antenna radar system

2007

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“…In the ionosphere, 'partial reflection' sounding has a long history starting in the early 1950's [Dieminger, 1968;Belrose, 1970;Vincent et al, 1977;Manson et al, 1978]. Most experiments have been made in the frequency range 1-5 MHz.…”

Section: And Fresnel Scatteringmentioning

confidence: 99%

On the scattering and reflection mechanisms contributing to clear air radar echoes from the troposphere, stratosphere, and mesophere

Gage¹,

Balsley²

1980

Radio Science

147

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With the advent of the MST (mesosphere‐stratosphere‐troposphere) radar technique the atmosphere from 0 to 100 km can be observed with a single radar system. Several different mechanisms have been identified as causing the echoes observed by MST radars. Two primary mechanisms are scattering from turbulent irregularities and Fresnel (or partial) reflection from horizontal strata. Two additional mechanisms that apply primarily to the upper mesosphere are meteor scatter and thermal (or incoherent or Thomson) scatter. Below the stratopause the refractive index structure responsible for the echoes arises solely from neutral atmosphere fluctuations; above the stratopause the radar cross section of such fluctuations is enhanced by the presence of free electrons (moreover, in the absence of small‐scale neutral fluctuations the electrons alone can provide the scattered signal). This paper is an attempt to unify the scattering and reflection theories in the light of observational studies.

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“…Wind observations at mesospheric altitudes have been used for several comparisons between radars at different frequencies and meteorological rockets (e.g. Vincent et al, 1977;Lübken et al, 1990;Manson et al, 1992;Müllemann and Lübken, 2005). Winds derived from different radar methods were compared to each other in the literature (e.g.…”

Section: Introductionmentioning

confidence: 99%

Comparison of wind measurements in the troposphere and mesosphere by VHF/MF radars and in-situ techniques

et al. 2008

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Abstract. Radar wind observations at frequencies between 1.98 and 53.5 MHz obtained at polar latitudes were compared to in-situ wind measurements by radiosondes at tropospheric altitudes and to winds from falling spheres at mesospheric altitudes. Comparisons are shown for several campaigns of radiosonde and falling sphere observations. The radar wind directions agree well to the radiosonde and falling sphere observations and are highly correlated. The winds estimated from radar measurements are less than the radiosonde data by about 15% for spaced antenna observations and by about 10% for the Doppler beam swinging experiment. At mesospheric altitudes the spaced antenna winds obtained from the wide-beam Andenes MF radar are underestimated in the order of 35% and winds from the narrow-beam Saura MF radar are underestimated by about 20% compared to falling sphere winds at altitudes between 70 and 80 km. Furthermore, the relation between wind measurements using narrow-beam and wide-beam antenna arrangements for the MF radars is discussed and VHF radar observations are compared to the wide-beam MF radar.

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A comparison of partial reflection drifts with winds determined by rocket techniques—1

Cited by 44 publications

References 15 publications

Initial results from SKiYMET meteor radar at Thumba (8.5°N, 77°E): 1. Comparison of wind measurements with MF spaced antenna radar system

Initial results from SKiYMET meteor radar at Thumba (8.5°N, 77°E): 1. Comparison of wind measurements with MF spaced antenna radar system

On the scattering and reflection mechanisms contributing to clear air radar echoes from the troposphere, stratosphere, and mesophere

Comparison of wind measurements in the troposphere and mesosphere by VHF/MF radars and in-situ techniques

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