scholarly journals Sudden impulse observations in the dayside magnetosphere by THEMIS

2014 ◽  
Vol 119 (12) ◽  
pp. 9476-9496 ◽  
Author(s):  
A. A. Samsonov ◽  
D. G. Sibeck ◽  
B. M. Walsh ◽  
N. V. Zolotova
Keyword(s):  
Sudden Impulse

Response of the inner magnetosphere and the plasma sheet to a sudden impulse

2008 ◽  
Vol 113 (A7) ◽  
pp. n/a-n/a ◽  
Author(s):  
K. Keika ◽  
R. Nakamura ◽  
W. Baumjohann ◽  
A. Runov ◽  
T. Takada ◽  
...  
Keyword(s):  
Plasma Sheet ◽  
Inner Magnetosphere ◽  
Sudden Impulse

scholarly journals Geomagnetic negative sudden impulse due to a magnetic cloud observed on May 13, 1995

2000 ◽  
Vol 105 (A8) ◽  
pp. 18835-18846 ◽  
Author(s):  
T. Takeuchi ◽  
T. Araki ◽  
H. Luehr ◽  
O. Rasmussen ◽  
J. Watermann ◽  
...  
Keyword(s):  
Magnetic Cloud ◽  
Sudden Impulse

scholarly journals Flow of a viscous compressible fluid produced in a circular tube by an impulsive point source

2011 ◽  
Vol 668 ◽  
pp. 100-112 ◽  
Author(s):  
B. U. FELDERHOF ◽  
G. OOMS
Keyword(s):  
Compressible Fluid ◽  
Numerical Scheme ◽  
Stokes Equations ◽  
Circular Tube ◽  
Slip Boundary Condition ◽  
Navier Stokes ◽  
Viscous Compressible Fluid ◽  
Navier Stokes Equations ◽  
Slip Boundary ◽  
Sudden Impulse

The flow of a viscous compressible fluid in a circular tube generated by a sudden impulse at a point on the axis is studied on the basis of the linearized Navier–Stokes equations. A no-slip boundary condition is assumed to hold on the wall of the tube. An efficient numerical scheme has been developed for the calculation of flow velocity and pressure disturbance as a function of position and time.

Guided waves in the plasma sheet and triggering of a substorm

1994 ◽  
Vol 12 (10/11) ◽  
pp. 1018-1021 ◽  
Author(s):  
V. V. Safargaleev ◽  
V. B. Lyatsky
Keyword(s):  
Plasma Sheet ◽  
Guided Waves ◽  
Solar Wind Plasma ◽  
Plasma Pressure ◽  
Magnetoacoustic Wave ◽  
Sudden Impulse ◽  
Field Lines ◽  
Guided Propagation ◽  
The Magnetic Field ◽  
Half Thickness

Abstract. A guided propagation of magnetoacoustic wave in the plasma sheet located between two lobes of the magnetotail is investigated. The dispersion equation for the wave and equation connecting a disturbance of plasma pressure inside the plasma sheet and amplitude of the plasma sheet boundary oscillations are obtained. For some value of plasma pressure disturbance, the displacement of the plasma sheet boundaries becomes of order of the half-thickness of the plasma sheet. In the case of symmetrical oscillations of the boundaries ("sausage-like" mode), it creates the favourable conditions for reconnection of the magnetic field lines in the magnetotail and may lead to triggering of a substorm. The magnetoacoustic wave may be generated by sudden impulse of the solar wind plasma pressure.

scholarly journals Spatio-temporal structure of Alfvén waves excited by a sudden impulse localized on an L-shell

2012 ◽  
Vol 30 (7) ◽  
pp. 1099-1106 ◽  
Author(s):  
D. Yu. Klimushkin ◽  
P. N. Mager ◽  
K.-H. Glassmeier
Keyword(s):  
Resonance Frequency ◽  
Temporal Structure ◽  
Alfven Wave ◽  
Energy Concentration ◽  
Small Scale ◽  
Source Surface ◽  
Local Resonance ◽  
Sudden Impulse ◽  
Magnetic Shell ◽  
Spatio Temporal

Abstract. This paper is concerned with the spatial structure and temporal evolution of the azimuthally small scale Alfvén wave generated by a sudden impulse concentrated on a given magnetic shell. At the outset, both poloidal and toroidal components are present in the wave's magnetic field. The oscillation in the poloidal component on a given magnetic shell is a superposition of two monochromatic oscillations, one with the local resonance frequency on this shell, and the other with the frequency corresponding to the resonance frequency on the source surface. The superposition of these two oscillations leads to beating. Due to phase mixing, the poloidal component of the oscillation decreases with time down to zero, transferring its energy to the toroidal component. Beating in the toroidal component is less pronounced. As time elapses, energy concentration near the source magnetic shell occurs with the frequency of the oscillation corresponding to the Alfvénic resonance frequency on this surface. Outside this thin region wave amplitudes become rather small at oscillation frequencies corresponding to the local resonance frequency of the respective magnetic shell.

Does TEC react to a sudden impulse as a whole? The 2015 Saint Patrick’s day storm event

2017 ◽  
Vol 60 (8) ◽  
pp. 1807-1816 ◽  
Author(s):  
M. Piersanti ◽  
C. Cesaroni ◽  
L. Spogli ◽  
T. Alberti
Keyword(s):  
Storm Event ◽  
Sudden Impulse
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