K
K. Yumoto
Researcher at Kyushu University
Publications - 102
Citations - 2066
K. Yumoto is an academic researcher from Kyushu University. The author has contributed to research in topics: Earth's magnetic field & Substorm. The author has an hindex of 23, co-authored 102 publications receiving 1848 citations.
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Lunar‐dependent equatorial ionospheric electrodynamic effects during sudden stratospheric warmings
Bela G. Fejer,M. E. Olson,Jorge L. Chau,Claudia Stolle,H. Lühr,Larisa Petrovna Goncharenko,K. Yumoto,Tsutomu Nagatsuma +7 more
TL;DR: In this paper, the longitudinal dependence of equatorial ionospheric electrodynamic perturbations during sudden stratospheric warmings was studied using plasma drift and magnetic field measurements during the 2001-2009 December solstices.
Journal ArticleDOI
Prompt penetration electric fields (PPEFs) and their ionospheric effects during the great magnetic storm of 30-31 October 2003
Bruce T. Tsurutani,Bruce T. Tsurutani,O. P. Verkhoglyadova,O. P. Verkhoglyadova,Anthony J. Mannucci,Akinori Saito,Tohru Araki,K. Yumoto,Toshitaka Tsuda,M. A. Abdu,J. H. A. Sobral,Walter D. Gonzalez,H. McCreadie,Gurbax S. Lakhina,Vytenis M. Vasyliūnas +14 more
TL;DR: In this paper, the ionospheric effects of prompt penetration electric fields (PPEFs) for a variety of interplanetary magnetic field directions were explored, and the authors used the great magnetic storm of 30-31 October as an example of PPEF effects.
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Sawtooth Oscillations Directly Driven by Solar Wind Dynamic Pressure Enhancements
TL;DR: In this paper, the authors examined four well-defined events of sawtooth oscillations in energetic particle flux and magnetic field at geosynchronous orbit and found that there indeed exists a series of solar wind dynamic pressure enhancements.
Journal ArticleDOI
Some aspects of the relation between Pi 1-2 magnetic pulsations observed at L = 1.3-2.1 on the ground and substorm-associated magnetic field variations in the near-Earth magnetotail observed by AMPTE CCE
K. Yumoto,Kazue Takahashi,Takao Saito,Frederick W. Menk,Brian Fraser,Thomas A. Potemra,L. J. Zanetti +6 more
TL;DR: Takahashi et al. as mentioned in this paper studied the relation between Pi 1-2 pulsations on the ground and substorm-associated magnetic field variations in space using data obtained at low-latitude conjugate stations and in the near-Earth magnetotail by the AMPTE CCE spacecraft.
The Evolution of North-South Aligned Auroral Forms into Auroral Torch Structures : The Generation of Omega Bands and Ps6 Pulsations via Flow Bursts.
Michael G. Henderson,Larry Kepko,Harlan E. Spence,Martin Connors,John B. Sigwarth,L. A. Frank,Howard J. Singer,K. Yumoto +7 more
TL;DR: In this paper, it was shown conclusively that the equatorward moving north-south aligned auroral forms that are ejected episodically from the poleward boundary can evolve directly into torch structures which contribute to a well-defined omega-band form.