Results 21 to 30 of about 4,523 (241)

SABRE observations of structured ionospheric flows during substorm expansion phase onset [PDF]

Annales Geophysicae, 1994
The irregularity velocity patterns observed by the SABRE coherent radar at substorm expansion phase onset, which is identified by magnetometer observations of Pi2 pulsations, are occasionally highly structured.
E. G. Bradshaw, M. Lester, T. B. Jones
doaj   +1 more source

Statistical study of high-latitude plasma flow during magnetospheric substorms [PDF]

Annales Geophysicae, 2004
We have utilised the near-global imaging capabilities of the Northern Hemisphere SuperDARN radars, to perform a statistical superposed epoch analysis of high-latitude plasma flows during magnetospheric substorms.
G. Provan, M. Lester, S. B. Mende, S. E. Milan   +3 more
doaj   +1 more source

VLF, magnetic bay and Pi2 substorm signatures at auroral and midlatitude ground stations [PDF]

, 2002
A superposed epoch analysis of 100–300 substorms is performed to determine the median size and shape of the substorm-associated VLF chorus, magnetic bay, and Pi2 pulsation burst observed at the near-auroral Halley research station, Antarctica, and at the
Freeman, M.P., Hunter, S., Smith, A.J., Milling, D.K.   +3 more
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Statistical visualization of the Earth's magnetotail and the implied mechanism of substorm triggering based on superposed-epoch analysis of THEMIS data [PDF]

Annales Geophysicae, 2014
To investigate the physical mechanism responsible for substorm triggering, we performed a superposed-epoch analysis using plasma and magnetic-field data from THEMIS probes. Substorm onset timing was determined based on auroral breakups detected by all-
S. Machida, Y. Miyashita, A. Ieda, M. Nosé, V. Angelopoulos, J. P. McFadden   +5 more
doaj   +1 more source

A joint cluster and ground-based instrument study of two magnetospheric substorm events on 1st september 2002 [PDF]

, 2004
We present a coordinated ground- and space- based multi-instrument study of two magnetospheric substorm events that occurred on 1 September 2002, during the interval from 18:00 UT to 24:00 UT.
S. W. H. Cowley, J.-M. Bosqued, Dewhurst, J. P., Draper, N. C., J. P. Dewhurst, Dewhirst, J. P., Bosqued, J.-M., Fazakerley, A. N., Bogdanova, Y. V., A. Grocott, Bosqued, J. M., G. Provan, Bogdanova, Y., J. A. Davies, Milan, S. E., Provan, G., Lester, M., Wild, J. A., J. A. Wild, Grocott, A., M. Lester, A. N. Fazakerley, Davies, J. A., S. E. Milan, Cowley, S. W. H., N. C. Draper, Y. Bogdanova   +26 more
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A multipoint study of a substorm occurring on 7 December, 1992, and its theoretical implications [PDF]

, 1999
On 7 December 1992, a moderate substorm was observed by a variety of satellites and ground-based instruments. Ionospheric flows were monitored near dusk by the Goose Bay HF radar and near midnight by the EISCAT radar. The observed flows are compared here
Enno, G., Davda, V. N., M. R. Hairston (7612328), S. W. H. Cowley (7590302), E. Friis-Christensen, Lockwood, M., Friis-Christensen, Eigil, Friis-Christensen, E., Hairston, M.R., J. S. Murphree (7612340), Mark Lester (6477935), H. Lühr, Murphree, J. S., H. Luhr (7612334), Lester, M., E. Friis-Christensen (7612325), Greenwald, R.A., V. N. Davda, M. Lester, Pinnock, M., Davda, V.N., Murphree, J.S., Reeves, G.D., Cowley, S. W. H., M. Lockwood (7612331), Greenwald, R. A., G. Enno, S. W. H. Cowley, N. J. Fox, Reeves, G. D., Lockwood, Mike, N. J. Fox (7612316), R. A. Greenwald, M. R. Hairston, M. Pinnock, Lühr, H., M. Pinnock (7612343), Milling, D. K., J. S. Murphree, G. D. Reeves (7612346), R. A. Greenwald (7590614), Fox, N.J., D. K. Milling, Cowley, S.W.H., Hairston, M. R., G. D. Reeves, Milling, D.K., M. Lockwood, V. N. Davda (7612319), G. Enno (7612322), D. K. Milling (7612337), Fox, N. J.   +51 more
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Non-triggered auroral substorms and long-period (1–4 mHz) geomagnetic and auroral luminosity pulsations in the polar cap [PDF]

Annales Geophysicae, 2017
A study is undertaken into parameters of the polar auroral and geomagnetic pulsations in the frequency range 1–4 mHz (Pc5∕Pi3) during quiet geomagnetic intervals preceding auroral substorms and non-substorm background variations.
N. Yagova, N. Nosikova, N. Nosikova, L. Baddeley, L. Baddeley, L. Baddeley, O. Kozyreva, D. A. Lorentzen, D. A. Lorentzen, D. A. Lorentzen, V. Pilipenko, V. Pilipenko, M. G. Johnsen   +12 more
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Towards a synthesis of substorm electrodynamics : HF radar and auroral observations [PDF]

, 2006
At 08:35 UT on 21 November 2004, the onset of an interval of substorm activity was captured in the southern hemisphere by the Far UltraViolet (FUV) instrument on board the IMAGE spacecraft. This was accompanied by the onset of Pi2 activity and subsequent
Tim K. Yeoman (7583066), P. L. Dyson, J. C. Devlin, H. U. Frey, Devlin, J. C., Parkinson, M. L., Lester, M., M. L. Parkinson (7591427), P. L. Dyson (7591430), Grocott, A., Dyson, P. L., M. Lester, M. L. Parkinson, H. U. Frey (7591265), Adrian Grocott (7590026), T. K. Yeoman, A. Grocott, Frey, H. U., Mark Lester (6477935), Yeoman, T. K., J. C. Devlin (7591433)   +20 more
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Substorms and Solar Eclipses: A Mutual Information Based Study

Geophysical Research Letters, 2023
Solar eclipses present a rare glimpse into the impact of ionospheric electrodynamics on the magnetosphere independent of other well studied seasonal influences.
S. E. Coyle, J. B. H. Baker, S. Chakraborty, M. D. Hartinger, M. P. Freeman, C. R. Clauer, Z. Xu, D. R. Weimer   +7 more
doaj   +1 more source

Vertical evolution of auroral acceleration at substorm onset [PDF]

, 2009
This study describes the onset process of auroral substorms in connection with the vertical evolution of auroral particle acceleration, on the basis of auroral kilometric radiation (AKR) dynamics.
Morioka, A., A. Morioka, R. R. Anderson, Misawa, H., Anderson, R.R., J. D. Menietti, Honary, F., F. Tsuchiya, Tsuchiya, F., Miyoshi, Y., Parks, G.K., Menietti, J.D., H. Misawa, G. K. Parks, Y. Miyoshi, Yumoto, K., F. Honary, K. Yumoto   +17 more
core   +1 more source