Results 41 to 50 of about 4,774 (237)

Letter to the Editor
Low-frequency electric field fluctuations and field-aligned electron beams around the edge of an auroral acceleration region [PDF]

Annales Geophysicae, 2001
Electron beams narrowly collimated to the magnetic field line were observed continuously from a down-ward current region to an auroral acceleration region (i.e., upward current region).
W. Miyake, W. Miyake, R. Yoshioka, A. Matsuoka, T. Mukai, T. Nagatsuma   +5 more
doaj   +1 more source

A superposed epoch analysis of auroral evolution during substorm growth, onset and recovery: open magnetic flux control of substorm intensity [PDF]

, 2009
We perform two superposed epoch analyses of the auroral evolution during substorms using the FUV instrument on the Imager for Magnetopause-to-Aurora Global Explorer ( IMAGE) spacecraft. The larger of the two studies includes nearly 2000 substorms.
Hubert, Benoît, Boakes, PD, Colin Forsyth (7434155), Adrian Grocott (7590026), Forsyth, C., Milan, S.E., B. Hubert (7590023), Grocott, A, Imber, S. M., A. Grocott, Milan, SE, Imber, SM, S. M. Imber, Hubert, B., Boakes, P.D., Milan, S. E., P. D. Boakes, Boakes, P. D., C. Forsyth, Forsyth, C, Steve E. Milan (7589666), S.M. Imber (7592039), Grocott, A., Imber, S.M., S. E. Milan, Peter David Boakes (7591733), B. Hubert, Hubert, B   +27 more
core   +1 more source

SuperDARN E-region backscatter boundary in the dusk-midnight sector – tracer of equatorward boundary of the auroral oval [PDF]

Annales Geophysicae, 2002
We compare the locations of the equatorward boundaries of SuperDARN E-region backscatter and Hb  emissions, focusing on the dusk-midnight sector of the auroral oval where the proton aurora is statistically located equatorward of the discrete ...
P. T. Jayachandran, P. T. Jayachandran, E. F. Donovan, J. W. MacDougall, D. R. Moorcroft, J.-P. St. Maurice, P. Prikryl   +6 more
doaj   +1 more source

A signature of auroral precipitation in the nightside ionosphere of Venus

Geophysical Research Letters, 1990
We show here that the densities of mass‐28 ions measured by the Pioneer Venus Orbiter ion mass spectrometer (OIMS) on the nightside of Venus are highly variable and show little correlation with the values of the O+ densities. We have determined the total production rates of mass‐28 ions in the chemical equilibrium region and find that this production ...
Fox, Jane L., Taylor, H. A., Jr.
openaire   +4 more sources

Method to locate the polar cap boundary in the nightside ionosphere and application to a substorm event [PDF]

, 2006
International audienceIn this paper we describe a new method to be used for the polar cap boundary (PCB) determination in the nightside ionosphere by using the EISCAT Svalbard radar (ESR) field-aligned measurements by the 42-m antenna and southward ...
A. T. Aikio, O. Amm, Amm, Olaf, Aikio, A.T., Aikio, Anita T., Aikio, A. T., A. Kozlovsky, Kozlovsky, Alexander, Pitkänen, Timo, Pitkänen, T., Amm, O., Kozlovsky, A., T. Pitkänen   +12 more
core   +1 more source

Astrid-2, an advanced microsatellite for auroral research [PDF]

Annales Geophysicae, 2001
The successful launch of the Swedish microsatellite Astrid-2 in December 1998 began a new era of auroral research, with advanced microprobes of 30 kg or less used as research tools.
G. T. Marklund, L. G. Blomberg, S. Persson   +2 more
doaj   +1 more source

First simultaneous observations of flux transfer events at the high-latitude magnetopause by the cluster spacecraft and pulsed radar signatures in the conjugate ionosphere by the CUTLASS and EISCAT radars [PDF]

, 2001
Cluster magnetic field data are studied during an outbound pass through the post-noon high-latitude magnetopause region on 14 February 2001. The onset of several minute perturbations in the magnetospheric field was observed in conjunction with a ...
A. Balogh (7591361), S. W. H. Cowley, H. Khan, Balogh, A., Georgescu, E., J. A. Davies (4412452), T. K. Yeoman (7601525), J. A. Wild (7591442), T. K. Yeoman, M. W. Dunlop, Stanley William Herbert Cowley (7627505), G. Provan, Dunlop, M. W., Yeoman, T. K., S. E. Milan (7594526), E. Georgescu, J. A. Davies, Fornacon, K.-H., G. Provan (7602020), M. W. Dunlop (7591493), H. Khan (723527), Milan, S. E., Provan, G., Lester, M., K.-H. Fornaçon, K. H. Fornacon (7612235), Wild, J. A., Khan, H., J. A. Wild, M. Lester, A. Balogh, M. Lester (7589660), Davies, J. A., S. E. Milan, Cowley, S. W. H., E. Georgescu (7612238)   +35 more
core   +1 more source

Conductance Model for Extreme Events: Impact of Auroral Conductance on Space Weather Forecasts

Space Weather, 2020
Ionospheric conductance is a crucial factor in regulating the closure of magnetospheric field‐aligned currents through the ionosphere as Hall and Pedersen currents.
Agnit Mukhopadhyay, Daniel T. Welling, Michael W. Liemohn, Aaron J. Ridley, Shibaji Chakraborty, Brian J. Anderson   +5 more
doaj   +1 more source

Stereo CUTLASS-a new capability for the SuperDARN HF radars [PDF]

, 2004
International audienceThe Super Dual Auroral Radar Network (SuperDARN), which consists of networks of HF radars surrounding the northern and southern poles, has proven to be an extremely successful experimental technique in a wide range of scientific ...
S. W. H. Cowley, Crooks, S. J., M. J. Parsons (7590314), Hamadyk, P., S. W. H. Cowley (7590302), Thornhill, J. D., P. J. Chapman, N. M. Wade (7590326), D. B. Payne (7590317), Chapman, P. J., J. A. Davies (4412452), E. C. Thomas, T. K. Yeoman, S. J. Crooks (7590305), Thomas, E. C., N. M. Wade, Yeoman, T. K., S. J. Crooks, D. B. Payne, R. J. Barnes, J. A. Davies, E. C. Thomas (7590320), Tim K. Yeoman (7583066), McWilliams, K. A., Barnes, R. J., Milan, S. E., K. A. McWilliams, R. J. Barnes (7590329), Lester, M., P. Hamadyk (7590308), M. J. Parsons, Steve E. Milan (7589666), Payne, D. B., Wade, N. M., M. Lester, M. Lester (7589660), P. J. Chapman (7590299), K. A. McWilliams (7590311), Davies, J. A., S. E. Milan, Cowley, S. W. H., J. D. Thornhill, J. D. Thornhill (7590323), Parsons, M. J., P. Hamadyk   +44 more
core   +1 more source

Kelvin–Helmholtz vortices in the magnetopause boundary layer associated with auroral beads: conjunction observations from MMS and DMSP

Frontiers in Astronomy and Space Sciences
We report a Kelvin–Helmholtz vortex (KHV) event observed at the duskside magnetopause boundary layer by the magnetospheric multiscale (MMS) satellites in conjunction with auroral beads detected in the high-latitude ionosphere by the Defense ...
YunTian Hou, YunTian Hou, SuPing Duan, Lei Dai, Chi Wang, Chi Wang, Bruce T. Tsurutani   +6 more
doaj   +1 more source