H
H. W. Kroehl
Researcher at National Oceanic and Atmospheric Administration
Publications - 12
Citations - 2629
H. W. Kroehl is an academic researcher from National Oceanic and Atmospheric Administration. The author has contributed to research in topics: Interplanetary magnetic field & Substorm. The author has an hindex of 11, co-authored 12 publications receiving 2307 citations.
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Journal ArticleDOI
What is a geomagnetic storm
Walter D. Gonzalez,J. A. Joselyn,Yohsuke Kamide,H. W. Kroehl,Gordon Rostoker,Bruce T. Tsurutani,Vytenis M. Vasyliunas +6 more
TL;DR: In this article, an attempt is made to define a geomagnetic storm as an interval of time when a sufficiently intense and long-lasting interplanetary convection electric field leads, through a substantial energization in the magnetosphere-ionosphere system, to an intensified ring current sufficiently strong to exceed some key threshold of the quantifying storm time Dst index.
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Interhemispheric asymmetry of the high-latitude ionospheric convection pattern
Gang Lu,Arthur D. Richmond,Barbara A. Emery,Patricia H. Reiff,O. de la Beaujardiere,F. J. Rich,W. F. Denig,H. W. Kroehl,Larry R. Lyons,J. M. Ruohoniemi,E. Friis-Christensen,H. J. Opgenoorth,Moa Persson,R. P. Lepping,Alan S. Rodger,T. J. Hughes,A. McEwin,S. Dennis,Ray J. Morris,Gavin Burns,L. Tomlinson +20 more
TL;DR: In this article, the authors used assimilative mapping of ionospheric electrodynamics technique to derive the large-scale high-latitude ionosphere convection patterns simultaneously in both northern and southern hemispheres during the period of January 27-29, 1992.
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Mapping electrodynamic features of the high-latitude ionosphere from localized observations: Combined incoherent-scatter radar and magnetometer measurements for January 18-19, 1984
Arthur D. Richmond,Yohsuke Kamide,Byung-Ho Ahn,S.-I. Akasofu,D. Alcaydé,Michel Blanc,O. de la Beaujardiere,David S. Evans,John C. Foster,E. Friis Christensen,T. J. Fuller Rowell,John M. Holt,Delores J. Knipp,H. W. Kroehl,R. P. Lepping,R. J. Pellinen,C. Senior,A. N. Zaitzev +17 more
TL;DR: In this article, large-scale electric potential patterns, describing ionospheric convection, are estimated for northern high latitudes during January 18-19, 1984, from combined incoherent-scatter radar and ground magnetometer observations, using the technique of Richmond and Kamide (this issue).
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Global distribution of ionospheric and field‐aligned currents during substorms as determined from six IMS meridian chains of magnetometers: Initial results
Yohsuke Kamide,Byung-Ho Ahn,S.-I. Akasofu,Wolfgang Baumjohann,E. Friis-Christensen,H. W. Kroehl,H. E. Maurer,Arthur D. Richmond,Gordon Rostoker,R. W. Spiro,J. K. Walker,A. N. Zaitzev +11 more
TL;DR: In this paper, the authors used magnetic records from 70 stations to deduce patterns of electric fields and currents in high latitudes on March 17, 18, and 19, 1978.
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Ionospheric convection response to slow, strong variations in a northward interplanetary magnetic field: A case study for January 14, 1988
Delores J. Knipp,Barbara A. Emery,Arthur D. Richmond,N. U. Crooker,Marc R. Hairston,Judy Cumnock,William Denig,Frederick J. Rich,O. de la Beaujardiere,J. M. Ruohoniemi,Alan S. Rodger,Geoff Crowley,Byung-Ho Ahn,David S. Evans,T. J. Fuller Rowell,E. Friis Christensen,Mike Lockwood,H. W. Kroehl,C. G. Maclennan,A. McEwin,R. J. Pellinen,Ray J. Morris,G. B. Burns,V. O. Papitashvili,A. N. Zaitzev,Oleg Troshichev,Natsuo Sato,P. Sutcliffe,L. Tomlinson +28 more
TL;DR: In this paper, the authors analyzed ionospheric convection patterns over the polar regions during the passage of an interplanetary magnetic cloud on January 14, 1988, when the Interplanetary Magnetic field (IMF) rotated slowly in direction and had a large amplitude.