Results 61 to 70 of about 4,523 (241)

Energy Dependence of Energetic Electron Precipitation Rates Near the Foot of Electron Isotropy Boundary

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract We report a rare quiet‐time observation by NOAA‐18 spacecraft flying nearly along the electron isotropy boundary (IBe). Complemented by data from four nearby meridional IBe crossings of other POES spacecraft, this case study provides a novel quantitative information concerning the regular energy dependence of the loss‐cone filling ratio (Jprec/
V. A. Sergeev, A. R. Dibaeva, N. A. Stepanov, A. V. Artemyev, R. M. Millan, A. Y. Ukhorskiy   +5 more
wiley   +1 more source

Cluster magnetotail observations of a tailward-travelling plasmoid at substorm expansion phase onset and field aligned currents in the plasma sheet boundary layer [PDF]

, 2005
We present data from both ground- and space- based instruments for a substorm event which occurred on 5 October 2002, with an expansion phase onset time of 02:50 UT determined from the ground magnetometer data.
H. J. Singer, M. G. Henderson (7591460), S. W. H. Cowley (7590302), M. G. Henderson, J. A. Davies (4412452), H. J. Singer (7591463), Fazakerley, A. N., Bosqued, J. M., Mark Lester (6477935), Donovan, E., J-M. Bosqued (7591451), Nakamura, R., Milan, S. E., Singer, H. J., Lester, M., E. Donovan (7591466), J. Waterman, J. F. Watermann (7591277), J. A. Wild, Grocott, A., M. Lester, A. N. Fazakerley, Watermann, J. F., Davies, J. A., S. E. Milan, Cowley, S. W. H., N. C. Draper, Gabrielle P. Provan (7591445), A. N. Fazakerley (7591259), Owen, C. J., R. Nakamura, J. P. Dewhurst (7591454), S. W. H. Cowley, J.-M. Bosqued, C. J. Owen, Dewhurst, J. P., C. J. Owen (7591457), Draper, N. C., J. P. Dewhurst, Adrian Grocott (7590026), J. A. Wild (7591442), Bosqued, J.-M., Waterman, J., A. Grocott, G. Provan, A. Lahiff, Wild, J.A., J. A. Davies, A. D. Lahiff (7591448), Provan, G., J.A. Wild, Wild, J. A., Henderson, M. G., Steve E. Milan (7589666), R. Nakamura (7591343), E. Donovan, Lahiff, A., N. C. Draper (7591439)   +57 more
core   +1 more source

Substorms: Future of magnetospheric substorm—Storm research

Eos, Transactions American Geophysical Union, 1989
We have made good progress in revealing and understanding the great complexity of magnetospheric substorm phenomena and processes during the last two decades. In spite of such advance, however, there are several areas in which a serious attempt for new advance is required. Seven areas are identified for discussion. I would like to encourage the younger
openaire   +1 more source

Earthward Propagated Auroral Kilometric Radiation: Observations From Polar

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract Auroral Kilometric Radiation (AKR), the strongest natural radio emission from Earth's magnetosphere, has been primarily observed in space. It is generally understood to propagate anti‐Earthward and be detected at large radial distances, while Earthward‐directed waves are thought to be blocked by the ionosphere. Surprisingly, AKR‐like emissions
Olha Melnychenko, Siyuan Wu, Daniel K. Whiter, Baptiste Cecconi, Claire Baskvetich   +4 more
wiley   +1 more source

Flux transport and tail dynamics during a prolonged substorm interval [PDF]

, 2006
We present multi-point observations of a substorm which took place on 29 August 2004. The near-Earth magnetotail dynamics were observed by Cluster C1 and Double Star TC1, in conjunction with observations of the Northern Hemisphere ionospheric convection ...
Watermann, J. F., Hubert, Benoît, Hubert, B., Carr, C. M., Slavin, J. A., Milan, S. E., Lucek, E. A., Lucek, E., Bosqued, J. M., Wild, J. A.   +9 more
core  

Study of auroral forms and electron precipitation with the IRIS, DASI and EISCAT systems [PDF]

, 2002
International audienceSimultaneous observations with the IRIS, DASI and EISCAT systems are employed in the study of the spatial distribution and temporal evolution of auroral forms and precipitation regions during substorm activity.
del Pozo, C. F., N. Stamatiou, Kosch, M. J., M. J. Kosch, Stamatiou, N., F. Honary, Honary, F., C. F. del Pozo   +7 more
core   +1 more source

A Novel Magnetosphere–Ionosphere Coupling Model for the Onset of Substrom Expansion Phase

Frontiers in Astronomy and Space Sciences, 2021
A novel magnetosphere–ionosphere (M-I) coupling model is proposed to simulate the brightening of the onset auroral arc of a magnetospheric substorm event.
P. S. Wang, L. H. Lyu
doaj   +1 more source

First Observation of the Second Harmonic of Upper Band Chorus Waves Linking to Slow Z‐Mode

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract The Z‐mode, comprising fast and slow branches, is a ubiquitous electromagnetic wave in planetary magnetospheres. While fast Z‐mode generation is attributed to electron cyclotron maser instability, the slow Z‐mode mechanism remains unresolved.
Si Liu, Zhonglei Gao, Yaxiong Zhou, Hongming Yang, Fuliang Xiao, Archie James Johnston, Lixian Yang   +6 more
wiley   +1 more source

AKR breakup and auroral particle acceleration at substorm onset [PDF]

, 2008
The dynamical behavior of auroral kilometric radiation (AKR) is investigated in connection with auroral particle acceleration at substorm onsets using high-time-resolution wave spectrograms provided by Polar/PWI electric field observations.
Morioka, A., Yumoto, K., Honary, Farideh, Misawa, H., Anderson, R.R., Donovan, E.F., Spanswick, E., Tsuchiya, F., Miyoshi, Y., Parks, G.K., Menietti, J.D.   +10 more
core  

Multi-scale observations of magnetotail flux transport during IMF-northward non-substorm intervals [PDF]

, 2007
Simultaneous observations by the Cluster spacecraft and SuperDARN radars are presented of magnetotail flux transport during northward, but BY-dominated IMF.
H. U. Frey, H. Rème, C. J. Owen, Adrian Grocott (7590026), C.J. Owen (7591874), T. Takada (7591877), T. K. Yeoman, A. Grocott, Yeoman, T. K., Amm, O., Takada, T., Tim K. Yeoman (7583066), Rème, H., L. Juusola, Nakamura, R., L. Juusola (7591871), Milan, S. E., O. Amm, H. Rème (7591274), Steve E. Milan (7589666), Grocott, A., R. Nakamura (7591343), S. E. Milan, Juusola, L., T. Takada, O. Amm (7591346), H.U. Frey (7591868), Frey, H. U., Owen, C. J., R. Nakamura   +29 more
core   +1 more source