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There are a total of 18 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Cusp and LLBL as Sources of the Isolated Dayside Auroral Feature During Northward IMF
Author(s): Chang, S.-W.; Gallagher, D. L.; Spann, J. F.; Mende, S. B.; Greenwald, R. A.; Newell, P. T.
Abstract: An intense dayside proton aurora was observed by Imager for Magnetopause-to- Aurora Global Exploration Far Ultra-Violet imager (IMAGE FUV) for an extensive period of northward interplanetary magnetic field (IMF) on 17 and 18 ...
NASA Center: Goddard Space Flight Center, Marshall Space Flight Center
Publication Year: 2004
Added to NTRS: 2005-05-17
Document ID: 20050163121
HF radar observations of Pc 5 field line resonances in the midnight/early morning MLT sector
Author(s): Ruohoniemi, J. M.; Greenwald, R. A.; Baker, K. B.; Samson, J. C.
Abstract: The technique of F region sounding by HF coherent radar is applied to the study of field line resonances equatorward of a region of shear flow in the early morning sector. The motions were predominantly in the geomagnetic ...
NASA Center: NASA (non Center Specific)
Publication Year: 1991
Added to NTRS: 2004-11-03
Accession Number: 91A51979; Document ID: 19910067356
Simultaneous HF-radar and DMSP observations of the cusp
Author(s): Baker, K. B.; Greenwald, R. A.; Ruohoniemi, J. M.; Dudeney, J. R.; Pinnock, M., et al.
Abstract: The Geospace Environment Modeling (GEM) Program is directed toward modeling the coupled solar wind/magnetosphere/ionosphere system. The inter-calibration of ground-based observations of the ionosphere and satellite ...
NASA Center: NASA (non Center Specific)
Publication Year: 1990
Added to NTRS: 2004-11-03
Accession Number: 91A11067; Document ID: 19910026444
Auroral radar and rocket double-probe observations of the electric field across the Harang discontinuity
Author(s): Cahill, L. J., Jr.; Greenwald, R. A.; Nielsen, E.
Abstract: The region of plasma flow and electric field reversal in the late evening auroral oval was observed simultaneously by auroral radar and by rocket. A strong, 30-50 mV/m, northward electric field was measured in the southern ...
NASA Center: NASA (non Center Specific)
Publication Year: 1978
Added to NTRS: 2004-11-03
Accession Number: 78A48035; Document ID: 19780064126
The determination of time-stationary two-dimensional convection patterns with single-station radars
Author(s): Freeman, M. P.; Ruohoniemi, J. M.; Greenwald, R. A.
Abstract: 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. Under certain circumstances the ...
NASA Center: NASA (non Center Specific)
Publication Year: 1991
Added to NTRS: 2004-11-03
Accession Number: 91A51982; Document ID: 19910067359
The response of the high-latitude dayside ionosphere to an abrupt northward transition in the IMF
Author(s): Ruohoniemi, J. M.; Greenwald, R. A.; De La Beaujardiere, O.; Lester, M.
Abstract: We examine the response of the high-latitude ionosphere in the prenoon sector to a northward turning of the IMF. The event was observed in the 11-13 UT interval on June 1, 1987, in the course of a multiday SUNDIAL campaign. ...
NASA Center: Goddard Space Flight Center
Publication Year: 1993
Added to NTRS: 2004-11-03
Accession Number: 93A55201; Document ID: 19930071204
Estimating gravity wave parameters from oblique high-frequency backscatter: Modeling and analysis
Author(s): Bristow, W. A.; Greenwald, R. A.
Abstract: A new technique for estimating electron density perturbation amplitudes of traveling ionospheric disturbances (TIDs), using HF radar data, is presented. TIDs are observed in HF radar data as enhancements of the ...
NASA Center: Goddard Space Flight Center
Publication Year: 1995
Added to NTRS: 2004-11-03
Accession Number: 95A78766; Document ID: 19950047167
Evolution of Ionospheric Convection during a Double Transpolar Arc Phenomenon on February 11, 1999
Author(s): Narita, Y.; Maezawa, K.; Spann, J. F.; Parks, G. K.; Marklund, G. T.; Kullen, A.; Ivchenko, N.; Greenwald, R. A.; Sato, N.; Yamagishi, H., et al.
Abstract: An evolution of ionospheric convection was studied for a double transpolar arc phenomenon on February 11, 1999. While one transpolar arc split from the auroral oval in the morning sector and drifted duskward, another arc ...
NASA Center: Marshall Space Flight Center
Publication Year: 2002
Added to NTRS: 2004-11-03
Document ID: 20030000986
An ionospheric signature of possible enhanced magnetic field merging on the dayside magnetopause
Author(s): Pinnock, M.; Rodger, A. S.; Dudeney, J. R.; Greenwald, R. A.; Baker, K. B., et al.
Abstract: The high temporal and spatial resolution of the Polar Anglo-American Conjugate Experiment radar data have permitted the evolution and formation of a transient plasma velocity signature in the cusp ionosphere to be studied. ...
NASA Center: NASA (non Center Specific)
Publication Year: 1991
Added to NTRS: 2004-11-03
Accession Number: 91A34462; Document ID: 19910049839
Mapping high-latitude plasma convection with coherent HF radars
Author(s): Ruohoniemi, J. M.; Greenwald, R. A.; Baker, K. B.; Villain, J.-P.; Hanuise, C., et al.
Abstract: Several methods developed for mapping high-latitude plasma convection with a high-latitude HF radar are described, which utilize coherent backscatter from electron density irregularities at F-region altitudes to observe ...
NASA Center: NASA (non Center Specific)
Publication Year: 1989
Added to NTRS: 2004-11-03
Accession Number: 90A11510; Document ID: 19900024455
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