Journal ArticleDOI
Ground-based imaging of magnetospheric boundaries
TLDR
In this paper, the future direction of ground-based imaging of magnetospheric boundaries is discussed and the key issues are reliable identification of further magnetosphere boundaries such as near-Earth neutral x-line, improvements to the groundbased experiment network to improve the spatial and temporal resolution, and the coverage, development of data assimilation and visualisation techniques.About:
This article is published in Advances in Space Research.The article was published on 2000-01-01. It has received 26 citations till now.read more
Citations
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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
Measuring the dayside reconnection rate during an interval of due northward interplanetary magnetic field
Gareth Chisham,Mervyn P. Freeman,I. J. Coleman,Michael Pinnock,Marc R. Hairston,Mark Lester,George J. Sofko +6 more
TL;DR: In this paper, a detailed spatiotemporal measurements of the reconnection electric field in the Northern Hemisphere ionosphere during an extended interval of northward interplanetary magnetic field were presented.
Journal ArticleDOI
A technique for accurately determining the cusp-region polar cap boundary using SuperDARN HF radar measurements
Gareth Chisham,Mervyn P. Freeman +1 more
TL;DR: In this paper, a series of threshold algorithms were applied to a simulated cusp-region spectral width data set, to assess the accuracy of different algorithms and showed that simple threshold algorithms correctly identified the boundary location in, at most, 50% of the cases and that the average boundary error is at least ~ 1−2 range gates (~ 1° latitude).
Journal ArticleDOI
The location and rate of dayside reconnection during an interval of southward interplanetary magnetic field
Michael Pinnock,Gareth Chisham,I. J. Coleman,Mervyn P. Freeman,Marc R. Hairston,Jean-Paul Villain +5 more
TL;DR: In this paper, the authors used ionospheric data from the SuperDARN radar network and a DMSP satellite to obtain a comprehensive description of the spatial and temporal pattern of day-side reconnection.
Journal ArticleDOI
Remote sensing of the spatial and temporal structure of magnetopause and magnetotail reconnection from the ionosphere
Gareth Chisham,Mervyn P. Freeman,Gary A. Abel,Mai Mai Lam,Michael Pinnock,I. J. Coleman,Steve Milan,Mark Lester,William A. Bristow,R. A. Greenwald,George J. Sofko,Jean-Paul Villain +11 more
TL;DR: In this paper, a complete methodology for the remote sensing of magnetic reconnection in the magnetosphere from the ionosphere is presented, which combines measurements of ionospheric plasma convection and the ionosphere footprint of the reconnection separatrix.
References
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Journal ArticleDOI
DARN/SUPERDARN : A global view of the dynamics of high-latitude convection
R. A. Greenwald,K. B. Baker,J. R. Dudeney,Michael Pinnock,T. B. Jones,E. C. Thomas,Jean-Paul Villain,Jean-Claude Cerisier,C. Senior,C. Hanuise,R. D. Hunsucker,George J. Sofko,James A. Koehler,Erling Nielsen,R. J. Pellinen,Anthony Walker,N. Saot,H. Yamagishi +17 more
TL;DR: The Dual Auroral Radar Network (DARN) is a global-scale network of HF and VHF radars capable of sensing backscatter from ionospheric irregularities in the E and F-regions of the high-latitude ionosphere as mentioned in this paper.
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
Statistical patterns of high‐latitude convection obtained from Goose Bay HF radar observations
J. M. Ruohoniemi,R. A. Greenwald +1 more
TL;DR: In this article, the authors derived a series expansions in spherical harmonics to describe the statistical interplanetary magnetic field (IMF) dependencies of ionospheric convection in the high-latitude region of the northern hemisphere.
Journal ArticleDOI
A synthesis of magnetospheric substorm models
TL;DR: In this article, the authors construct a coherent description of substorm development by extracting some important components from these existing models, including the ionospheric influence on substorm expansion onset, current disruptions leading to convection surges and tailward propagating rarefaction waves, wave-induced precipitation, local time expansion of the disturbance region via velocity-shear-related instabilities, plasma sheet heating by resonant absorption of hydromagnetic waves, and the formation of magnetic reconnection domains.