Journal ArticleDOI
HF radar signatures of the cusp and low-latitude boundary layer
K. B. Baker,J. R. Dudeney,R. A. Greenwald,Michael Pinnock,Patrick T. Newell,Alan S. Rodger,N. Mattin,C.-I. Meng +7 more
TLDR
In this article, an intercalibration study made using the Polar Anglo-American Conjugate Radar Experiment radars located at Goose Bay, Labrador, and Halley Station, Antarctica, and the Defense Meteorological Satellite Program (DMSP) satellites is used to provide clear identifications of the ionospheric cusp and the low-latitude boundary layer (LLBL).Abstract:
Continuous ground-based observations of ionospheric and magnetospheric regions are critical to the Geospace Environment Modeling (GEM) program. It is therefore important to establish clear intercalibrations between different ground-based instruments and satellites in order to clearly place the ground-based observations in context with the corresponding in situ satellite measurements. HF-radars operating at high latitudes are capable of observing very large spatial regions of the ionosphere on a nearly continuous basis. In this paper we report on an intercalibration study made using the Polar Anglo-American Conjugate Radar Experiment radars located at Goose Bay, Labrador, and Halley Station, Antarctica, and the Defense Meteorological Satellite Program (DMSP) satellites. The DMSP satellite data are used to provide clear identifications of the ionospheric cusp and the low-latitude boundary layer (LLBL). The radar data for eight cusp events and eight LLBL events have been examined in order to determine a radar signature of these ionospheric regions. This intercalibration indicates that the cusp is always characterized by wide, complex Doppler power spectra, whereas the LLBL is usually found to have spectra dominated by a single component. The distribution of spectral widths in the cusp is of a generally Gaussian form with a peak at about 220 m/s. The distribution of spectral widths in the LLBL is more like an exponential distribution, with the peak of the distribution occurring at about 50 m/s. There are a few cases in the LLBL where the Doppler power spectra are strikingly similar to those observed in the cusp.read more
Citations
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Journal ArticleDOI
A decade of the Super Dual Auroral Radar Network (SuperDARN): scientific achievements, new techniques and future directions
Gareth Chisham,Mark Lester,Steve Milan,Mervyn P. Freeman,William A. Bristow,Adrian Grocott,Kathryn A. McWilliams,J. M. Ruohoniemi,Tim K. Yeoman,Peter. Dyson,R. A. Greenwald,Takashi Kikuchi,Michael Pinnock,J.P.S. Rash,Noriaki K. Sato,George J. Sofko,Jean-Paul Villain,Anthony Walker +17 more
TL;DR: The Super Dual Auroral Radar Network (SuperDARN) as discussed by the authors has been operating as an international co-operative organization for over 10 years and has been successful in addressing a wide range of scientific questions concerning processes in the magnetosphere, ionosphere, thermosphere, and mesosphere, as well as general plasma physics questions.
Journal ArticleDOI
Variations in the polar cap area during two substorm cycles
Steve Milan,Mark Lester,Stanley W. H. Cowley,Kjellmar Oksavik,Mitchell J. Brittnacher,R. A. Greenwald,George J. Sofko,Jean-Paul Villain +7 more
TL;DR: In this article, the authors employed observations from several sources to determine the location of the polar cap bound-ary, or open/closed field line boundary, at all local times, allowing the amount of open flux in the magnetosphere to be quantified.
Journal ArticleDOI
GPS TEC, scintillation and cycle slips observed at high latitudes during solar minimum
P. Prikryl,P. T. Jayachandran,S. C. Mushini,Dimitry Pokhotelov,John MacDougall,Eric Donovan,Emma Spanswick,J.-P. St.-Maurice +7 more
TL;DR: In this paper, the authors used data from the Canadian High Arctic Ionospheric Network (CHAIN) to measure amplitude and phase scintillation from L1 GPS signals and total electron content (TEC) from L 1 and L 2 GPS signals.
Journal ArticleDOI
CUTLASS Finland radar observations of the ionospheric signatures of flux transfer events and the resulting plasma flows
TL;DR: In this paper, a detailed study of one day of this data revealed a convection reversal boundary in the CUTLASS field of view (f.o.v) on the dayside, the direction of plasma flow either side of the boundary being typical of a dawn-cell convection pattern.
Journal ArticleDOI
Characteristics of plasma structuring in the cusp/cleft region at Svalbard
S. Basu,E. J. Weber,Terence Bullett,M. J. Keskinen,E. MacKenzie,Patricia H. Doherty,R. Sheehan,H. Kuenzler,P. Ning,J. Bongiolatti +9 more
TL;DR: In this article, a study of the distribution and dynamics of mesoscale (tens of kilometers to tens of meters) electron density irregularities in the dayside auroral region was performed at Ny Alesund, Svalbard, by measuring the effects of these irregularities on the amplitude scintillation of 250-MHz transmissions from a quasi-stationary polar satellite as well as the amplitude and phase scintillations of 1.6-GHz signals from Global Positioning System (GPS) satellites.
References
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Journal ArticleDOI
Magnetospheric boundary dynamics: DE 1 and DE 2 observations near the magnetopause and cusp
N. C. Maynard,T. L. Aggson,E. M. Basinska,W. J. Burke,Paul D. Craven,W. K. Peterson,Masahisa Sugiura,Daniel R. Weimer +7 more
TL;DR: In this paper, a detailed analysis of plasma and field measurements taken close in time by the DE 1 and DE 2 satellites during the September 6, 1982 magnetic storm is presented, and the relationship between the measurements made by the two satellites is discussed.
Journal ArticleDOI
The determination of time‐stationary two‐dimensional convection patterns with single‐station radars
TL;DR: In this paper, a critical examination of the accuracy of ionospheric vector velocity determinations, using realistic modeled flow patterns that are time-stationary but not spatially uniform, is presented.
Journal ArticleDOI
Flux transfer events at the dayside magnetopause: Transient reconnection or magnetosheath dynamic pressure pulses?
TL;DR: In this paper, the authors investigated the effect of the acceleration of the interplanetary magnetic field (IMF) on the frequency of flux transfer events (FTEs) at the dayside magnetopause, and found that most individual cases of FTEs observed by a single spacecraft can be explained by the pressure pulse model.
Journal Article
Statistical study of high-latitude E-region Doppler spectra obtained with the SHERPA HF radar
C. Hanuise,Jean-Paul Villain,Jean-Claude Cerisier,C. Senior,J. M. Ruohoniemi,R. A. Greenwald,K. B. Baker +6 more
TL;DR: In this article, a large number of Doppler spectra obtained at six HF frequencies in the E region with the SHERPA HF radar are analyzed statistically, characterized by their total power, their mean velocity and their spectral width.
Journal ArticleDOI
DE‐2 cusp observations: Role of plasma instabilities in topside ionospheric heating and density fluctuations
TL;DR: In this paper, the amplitude of these waves is shown to be far too small to contribute significantly to the observed ionospheric heating or density fluctuations by local waveparticle interactions, rather, the observed spatial variations are attributed to nonlocal field aligned heating processes and reflect the nonuniformity of the magnetosheath plasma's penetration into the ionosphere.
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