Results 31 to 40 of about 4,523 (241)

Are Storm-Time Substorms Triggered or Spontaneous? [PDF]

Journal of Astronomy and Space Sciences, 2004
Magnetic storms are almost always accompanied with substorms or substorm-like disturbances. Understanding the nature of the storm-time substorm is important for the currently critical issue of the storm-substorm relation.
D.Y. Lee, H. J. Kim, C. R. Choi
doaj   +1 more source

Excitation of twin-vortex flow in the nightside high-latitude ionosphere during an isolated substorm [PDF]

, 2002
We present SuperDARN radar observations of the ionospheric flow during a well-observed high-latitude substorm which occurred during steady northward IMF conditions on 2 December 1999.
Tim K. Yeoman (7583066), S. W. H. Cowley, J. B. Sigwarth, Watermann, J.F., Sigwarth, J.B., Cowley, S.W.H., Grocott, A., S.W.H. Cowley (7591226), Adrian Grocott (7590026), Watermann, J. F., T. K. Yeoman, Cowley, S. W. H., J. F. Watermann, A. Grocott, Sigwarth, J. B., Yeoman, T. K., Yeoman, T.K., J.B. Sigwarth (7591229), J.F. Watermann (7591232)   +18 more
core   +1 more source

Potential merits for substorm research from imaging of charge-exchange neutral atoms [PDF]

Annales Geophysicae, 1995
The in situ observations of the Earth magnetosphere performed over the past decades of space research have provided a rather good understanding of many partial localized processes of the magnetospheric substorm.
I. A. Daglis, S. Livi
doaj   +1 more source

The development of the substorm expansive phase: The “eye” of the substorm

Geophysical Research Letters, 1987
The explosive onset and development of a clearly defined auroral substorm has been analysed using data from the ultraviolet imager aboard the VIKING satellite. These data permit the evolution of the substorm to be traced with a time resolution as high as 40 seconds.
Gordon Rostoker, A. Vallance Jones, R. L. Gattinger, C. D. Anger, J. S. Murphree   +4 more
openaire   +1 more source

Superdarn radar HF propagation and absorption response to the substorm expansion phase [PDF]

, 2002
International audienceCoherent scatter HF ionospheric radar systems such as SuperDARN offer a powerful experimental technique for the investigation of the magnetospheric substorm.
J. A. Davies, Milan, S. E., Honary, F., T. K. Yeoman (7601525), J. A. Davies (4412452), J. K. Gauld (7674179), F. Honary (7604621), T. K. Yeoman, Davies, J. A., S. E. Milan, J. K. Gauld, F. Honary, Yeoman, T. K., S. E. Milan (7594526), Gauld, J. K.   +14 more
core   +1 more source

The Onset of a Substorm and the Mating Instability [PDF]

Journal of Geophysical Research: Space Physics, 2021
AbstractThe paper underlines the view that the appearance of beading and its nonlinear growth in the onset arc occurs independently from the onset of reconnection in the tail at about 20 RE. Both events follow from an extreme thinning of the central current sheet of the tail at the end of the growth phase.
Haerendel, Gerhard, Frey, Harald, Frey, Harald; 2 Space Sciences Laboratory University of California, Berkeley Berkeley USA   +2 more
openaire   +3 more sources

Correlated Interball/ground-based observations of isolated substorm: The pseudobreakup phase [PDF]

, 2001
International audienceWe study the isolated substorm that occurred after a long quiet period, which showed all of the substorm signatures except for the first half hour of the expansion phase, which could be characterized as a pseudobreakup sequence ...
I. A. Kornilov, Sergeev, V.A., R. D. Belian, N. L. Borodkova, Bösinger, T., Sergeev, V. A., Sauvaud, J.-A., Thomsen, M.F., Sergienko, T. I., Belian, R.D., Borodkova, N. L., V. N. Lutsenko, Sergienko, T.I., V. A. Sergeev, A. A. Skalsky, J.-A. Sauvaud, Belian, R. D., Lutsenko, V.N., Borodkova, N.L., Kornilov, I. A., Skalsky, A.A., Yahnin, A. G., Lutsenko, V. N., Thomsen, M. F., Kornilov, I.A., T. I. Sergienko, M. F. Thomsen, Yahnin, A., A. G. Yahnin, Skalsky, A. A., T. Bösinger   +30 more
core   +1 more source

Conjunction of tail satellites for substorm study: ISTP event of 1997 January 2

Geophysical Research Letters, 2000
The interval of 1997 January 1–2 was identified as a favorable conjunction of Geotail and IMP‐8 to examine substorm activity in the mid‐tail region prior to data acquisition. On January 2, 1997, global auroral observations from Polar indicated a substorm
A. T. Y. Lui, K. Liou, P. T. Newell, C. I. Meng, S. Ohtani, R. W. McEntire, N. J. Fox, R. P. Lepping, W. R. Paterson, J. B. Sigwarth, L. A. Frank, S. Kokubun, G. K. Parks, T. Moretto, K. Yumoto   +14 more
doaj   +1 more source

Concurrent Empirical Magnetic Reconstruction of Storm and Substorm Spatial Scales Using Data Mining and Virtual Spacecraft

Frontiers in Physics, 2021
Data mining (DM) has ushered in a new era of empirical magnetic reconstructions of the magnetosphere via application of the k-nearest neighbors (kNN) method.
Grant K. Stephens, Mikhail I. Sitnov
doaj   +1 more source

Substorm entropies [PDF]

Journal of Geophysical Research: Space Physics, 2009
The specific entropy (s = p/ργ) and total entropy (S = p1/γV) of the plasma sheet during substorms are investigated with DMSP observations using a method that assumes ion isotropy (as also assumed in the derivation of S = p1/γV) and empirical magnetic field models that capture the expected characteristics of substorm phases.
Simon Wing, Jay R. Johnson
openaire   +1 more source