Southern polar cap DPS and CADI ionosonde measurements: 2. F-region drift comparison

Morris, R. J.; Monselesan, Didier; Hyde, M.; Breed, A. M.; Wilkinson, P. J.

doi:10.1016/j.asr.2003.08.012

Cited by 8 publications

(6 citation statements)

References 6 publications

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“…Also a fair agreement between F-region drift measurements using ionosonde and incoherent scatter radar at magnetic equator [Woodman et al, 2006] has been reported. Observations of F-region drift measured using DPS and CADI ionosondes however shows substantial differences between the vertical and horizontal drift velocities [Morris et al, 2004]. Our paper shows the possibility of the improvement of the data reliability.…”

Section: Discussionmentioning

confidence: 64%

Ionospheric drift measurements: Skymap points selection

et al. 2008

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[1] In this paper we concentrate on the plasma drift measurement performed by Digisonde Portable Sounder DPS 4 developed by the UMLCAR, Lowell. Special attention is paid to the quality control of data acquired prior to drift velocity calculations. Risks of carefree use of raw Doppler spectra for the plasma motion analysis have been recognized in the Digisonde community. In this paper we propose improvements of Digisonde drift data processing for velocity evaluation and provide a detailed step-by step description: (1) robust height range selection, (2) setting limits on the Doppler frequency shift, and (3) setting limits on the echo arrival angle. Raw data that passed our quality control were then used to derive three velocity components of the bulk plasma drift in the ionosphere. In the paper we discuss, in detail, application of the method on the DPS measurements. However, this technique can be efficiently applied on any other digital ionosondes drift data processing.

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Section: Discussionmentioning

confidence: 64%

Ionospheric drift measurements: Skymap points selection

et al. 2008

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“…[26] Good agreement of CADI and DMSP measurements shown in this study suggests that the reasons for persistent differences between CADI and digital ionosonde measurements in Antarctica [Morris et al, 2004] are probably related to local arrangements for the experiment. One issue is low sensitivity of the antennae used by CADI so that the convection-derivation algorithm did not work well in the presence of noise.…”

Section: Discussion and Summarymentioning

confidence: 66%

“…In a case of another HF system is used to establish the quality of CADI measurements, such as in observations by Morris et al [2004], the question as to how similar are the collecting areas of the systems (for signal detection) is the one that requires serious scrutiny, and the velocity differences can be solely attributed to the difference in the location of the collecting areas under the condition of strongly nonuniform plasma flows. This is one of the conclusions by Grant et al [1995], who compared CADI and SuperDARN HF data.…”

Section: Discussion and Summarymentioning

confidence: 99%

“…Also, earlier comparisons of Tromso digital ionosonde data and EISCAT convection measurements revealed differences, at least for small integration time comparisons [Sedgemore et al, 1996[Sedgemore et al, , 1998. Differences in the velocity magnitude for some [19] In a case of another HF system is used to establish the quality of CADI measurements, such as in observations by Morris et al [2004], the question as to how similar are the collecting areas of the systems (for signal detection) is the one that requires serious scrutiny, and the velocity differences can be solely attributed to the difference in the location of the collecting areas under the condition of strongly nonuniform plasma flows. This is one of the conclusions by Grant et al [1995], who compared CADI and SuperDARN HF data.…”

Section: Discussion and Summarymentioning

confidence: 99%

“…CADI convection and HF SuperDARN radar velocity vectors do not agree perfectly [ Grant et al , 1995] and, moreover, cases were presented for which systematic and consistent differences between these two instruments were observed [ Xu , 2003]. Recently, Morris et al [2004] reported persistent differences in the velocity measurements between a CADI ionosonde and a portable digital ionosonde during their concurrent operation at the Cassey station in Antarctica. The differences were up to ∼200 m/s for typical ionosonde drifts of 500 m/s, with the CADI velocity magnitude being consistently smaller.…”

Section: Introductionmentioning

confidence: 99%

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A comparison of CADI‐inferred F region plasma convection and DMSP ion drift above Resolute Bay

2007

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[1] CADI ionosonde estimates of the F region plasma convection over Resolute Bay (NWT, Canada, MLAT = 83.5°) are compared with nearly simultaneous ion drift measurements on board DMSP satellites passing in the vicinity of the station. First, CADI vectors are projected onto the cross-track directions of DMSPs for 141 events and compared with ion drifts measured by DMSPs in these directions. The best linear fit line is found to have a slope of 0.75 and a shift of À13 m/s indicating good correspondence between the instruments with CADI showing minor underestimation. Then, a fully twodimensional comparison is performed by considering (1) magnitudes and azimuths and (2) eastward and northward components of the CADI and DMSP vectors. Reasonable agreement is shown as well. For both comparisons, the data spread is small; the correlation coefficients are of the order of 0.7-0.8. The strongest differences between the instruments were found to occur for the periods with spotty enhancement of the plasma flow detected by one or both instruments.

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