Multi-Step Dst Development and Ring Current Composition Changes During the 4-6 Jun 1991 Magnetic Storm

2001 ◽  
Author(s):  
J. U. Kozyra ◽  
M. W. Liemohn ◽  
C. R. Clauer ◽  
J. Ridley ◽  
M. F. Thomsen
Keyword(s):  
Magnetic Storm ◽  
Ring Current ◽  
Composition Changes

scholarly journals MultistepDstdevelopment and ring current composition changes during the 4-6 June 1991 magnetic storm

2002 ◽  
Vol 107 (A8) ◽  
pp. SMP 33-1-SMP 33-22 ◽  
Author(s):  
J. U. Kozyra ◽  
M. W. Liemohn ◽  
C. R. Clauer ◽  
A. J. Ridley ◽  
M. F. Thomsen ◽  
...  
Keyword(s):  
Magnetic Storm ◽  
Ring Current ◽  
Composition Changes

Magnetic storm of September 4, 1984: A synthesis of ring current spectra and energy densities measured with AMPTE/CCE

1985 ◽  
Vol 12 (5) ◽  
pp. 329-332 ◽  
Author(s):  
S. M. Krimigis ◽  
G. Gloeckler ◽  
R. W. McEntire ◽  
T. A. Potemra ◽  
F. L. Scarf ◽  
...  
Keyword(s):  
Magnetic Storm ◽  
Ring Current

scholarly journals <i>Swarm</i> field-aligned currents during a severe magnetic storm of September 2017

2019 ◽  
Author(s):  
Renata Lukianova
Keyword(s):  
Magnetic Storm ◽  
Ring Current ◽  
Current System ◽  
Small Scale ◽  
Substantial Fraction ◽  
H Index ◽  
Swarm Satellites ◽  
Scale Field ◽  
Extreme Behavior ◽  
A Current

Abstract. Swarm satellites observations are used to characterize the extreme behavior of large- and small-scale field-aligned currents (FACs) during the severe magnetic storm of September 2017. Evolution of the current intensities and the equatorward displacement of FACs are analyzed while the satellites cross the pre-midnight, pre-noon, dusk and dawn sectors in both hemispheres. The equatorward boundaries of FACs mainly follow the dynamics of ring current (as monitored in terms of the SYM-H index). The minimum latitude of the FAC boundaries is limited to 50° MLat, below which saturation occurs. The FAC densities are very variable and may increase dramatically, especially in the nightside ionosphere during the storm-time substorms. At the peak of substorm, the average FAC densities reach 3 μA/m2, while the quite level is below 0.1 μA/m2. The dawn–dusk asymmetry is manifested in the enhanced dusk-side R2 FACs in both hemispheres. Filamentary high-density structures are always observed confirming that a substantial fraction of R1/R2 FACs is composed of many small-scale currents. In the pre-noon sector, the bipolar structures (7.5 km width FACs of opposite polarities adjacent to each other) dominate, while in the post-midnight sector the upward and downward FACs tend to form more latitudinally extended structures of a certain polarity. The most intense small-scale FACs (up to ~80 μA/m2) is observed just in the post-midnight sector. Simultaneous magnetic and plasma perturbations indicate that this structure is likely a current system of a mesoscale auroral arc.

Lower thermospheric composition changes derived from optical and radar data taken at Sondre Stromfjord during the Great Magnetic Storm of February 1986

1991 ◽  
Vol 96 (A4) ◽  
pp. 5757 ◽  
Author(s):  
J. H. Hecht ◽  
D. J. Strickland ◽  
A. B. Christensen ◽  
D. C. Kayser ◽  
R. L. Walterscheid
Keyword(s):  
Magnetic Storm ◽  
Radar Data ◽  
Composition Changes

Ring current asymmetry during a magnetic storm

2008 ◽  
Vol 48 (6) ◽  
pp. 747-758 ◽  
Author(s):  
V. V. Kalegaev ◽  
K. Yu. Bakhmina ◽  
I. I. Alexeev ◽  
E. S. Belenkaya ◽  
Ya. I. Feldstein ◽  
...  
Keyword(s):  
Magnetic Storm ◽  
Ring Current
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