On determining the noon polar cap boundary from SuperDARN HF radar backscatter characteristics
Michael Pinnock,Alan S. Rodger +1 more
TLDR
In this paper, the authors examined the boundary determined over 6 h of magnetic local time around the noon sector and its relationship to the convection pattern using four SuperDARN radars and found that it is consistent with approximately 1 keV ions injected from a subsolar reconnection site.Abstract:
Previous work has shown that ionospheric HF radar backscatter in the noon sector can be used to locate the footprint of the magnetospheric cusp particle precipitation. This has enabled the radar data to be used as a proxy for the location of the polar cap boundary, and hence measure the flow of plasma across it to derive the reconnection electric field in the ionosphere. This work used only single radar data sets with a field of view limited to ∼2 h of local time. In this case study using four of the SuperDARN radars, we examine the boundary determined over 6 h of magnetic local time around the noon sector and its relationship to the convection pattern. The variation with longitude of the latitude of the radar scatter with cusp characteristics shows a bay-like feature. It is shown that this feature is shaped by the variation with longitude of the poleward flow component of the ionospheric plasma and may be understood in terms of cusp ion time-of-flight effects. Using this interpretation, we derive the time-of-flight of the cusp ions and find that it is consistent with approximately 1 keV ions injected from a subsolar reconnection site. A method for deriving a more accurate estimate of the location of the open-closed field line boundary from HF radar data is described.read more
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The role of Pc1-2 waves in spectral broadening of SuperDARN echoes from high latitudes
TL;DR: In this paper, the authors present a revised model that gives spectral width estimates close to the input signal bandwidth, which is explained by spatio-temporal non-uniformity of the ionospheric irregularities due to particle precipitation.
Journal ArticleDOI
Nightside studies of coherent HF Radar spectral width behaviour
Emma Woodfield,J. A. Davies,Mark Lester,Tim K. Yeoman,P. Eglitis,Mike Lockwood,Mike Lockwood +6 more
TL;DR: In this paper, the authors examined the relationship between high spectral width measured by the CUTLASS Finland HF radar and elevated electron temperatures observed by the EISCAT and ESR incoherent scatter radars in the post-midnight sector of magnetic local time.
Journal ArticleDOI
On the source of Pc1‐2 waves in the plasma mantle
Mark J. Engebretson,Terrance Onsager,Douglas E. Rowland,Richard E. Denton,J. L. Posch,Christopher T. Russell,Peter Chi,Roger L. Arnoldy,Brian J. Anderson,Hiroshi Fukunishi +9 more
TL;DR: In this paper, simultaneous field and particle observations from the Polar satellite and from ground magnetometer data were used to confirm the presence of these "mantle" waves and characterize the ion distributions associated with them.
Journal ArticleDOI
Magnetic local time, substorm, and particle precipitation-related variations in the behaviour of SuperDARN Doppler spectral widths
TL;DR: In this article, the spectral width boundary (SWB) and the open-closed magnetic field line boundary (OCB) were compared with the DMSP-inferred OCB during the day and night.
Journal ArticleDOI
Simultaneous ground‐based optical and HF radar observations of the ionospheric footprint of the open/closed field line boundary along the geomagnetic meridian
Xiangcai Chen,Xiangcai Chen,Xiangcai Chen,D. A. Lorentzen,D. A. Lorentzen,Joran Moen,Joran Moen,Kjellmar Oksavik,Kjellmar Oksavik,Lisa Baddeley,Lisa Baddeley +10 more
TL;DR: In this article, an adjusted method is introduced to identify the spectral width boundary (SWB), which does not require temporal smoothing across several scans, and the difference in latitude between the SWB and the simultaneously observed OI 630.0 nm boundary along a common line of sight is compared.
References
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Journal ArticleDOI
Modeling the Earth's magnetospheric magnetic field confined within a realistic magnetopause
TL;DR: In this paper, the authors describe a new approach to the problem of fitting the magnetosphereic magnetic field to spacecraft data, based on fits to a large number of observed crossing (allowing a parametrization by the solar wind pressure).
Journal Article
Excitation and decay of solar-wind driven flows in the magnetosphere-ionosphere system
TL;DR: In this paper, the authors considered the high-latitude ionospheric flows and their excitation and decay and proposed a flow-free equilibrium configuration for a magnetosphere which contains a given (arbitrary) amount of open flux.
Journal ArticleDOI
The cusp and the cleft/boundary layer: Low-altitude identification and statistical local time variation
Patrick T. Newell,Ching-I. Meng +1 more
TL;DR: In this paper, the authors investigated the distinction between the low-altitude cusp and the cleft (with the latter identified as the ionospheric signature of low-latitude boundary layer (LLBL)) on both a statistical and a case study basis.
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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
TL;DR: 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).
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Observations of an enhanced convection channel in the cusp ionosphere
Michael Pinnock,Alan S. Rodger,J. R. Dudeney,K. B. Baker,Patrick T. Newell,R. A. Greenwald,M. E. Greenspan +6 more
TL;DR: In this paper, the authors describe combined observations by the PACE HF backscatter radar and the DMSP F9 polar-orbiting satellite of a transient velocity signature in the southern hemisphere ionospheric cusp.