Electromagnetic Drift Waves at Substorm Onset: Theory and Observations

2020 ◽  
Vol 125 (11) ◽  
Author(s):  
O. Tsareva ◽  
G. Fruit ◽  
P. Louarn ◽  
C. Jacquey ◽  
A. Tur
Keyword(s):  
Substorm Onset ◽  
Drift Waves

scholarly journals Decay of the Dst field of geomagnetic disturbance after substorm onset and its implication to storm-substorm relation

1996 ◽  
Vol 14 (6) ◽  
pp. 608-618 ◽  
Author(s):  
T. Iyemori ◽  
D. R. K. Rao
Keyword(s):  
Ring Current ◽  
Geomagnetic Storms ◽  
Sharp Decrease ◽  
Geomagnetic Disturbance ◽  
Substorm Onset ◽  
Significant Development ◽  
H Index ◽  
Magnetospheric Tail ◽  
Storms And Substorms ◽  
Substorm Onsets

Abstract. In order to investigate the causal relationship between magnetic storms and substorms, variations of the mid-latitude geomagnetic indices, ASY (asymmetric part) and SYM (symmetric part), at substorm onsets are examined. Substorm onsets are defined by three different phenomena; (1) a rapid increase in the mid-latitude asymmetric-disturbance indices, ASY-D and ASY-H, with a shape of so-called `mid-latitude positive bay\\'; (2) a sharp decrease in the AL index; (3) an onset of Pi2 geomagnetic pulsation. The positive bays are selected using eye inspection and a pattern-matching technique. The 1-min-resolution SYM-H index, which is essentially the same as the hourly Dst index except in terms of the time resolution, does not show any statistically significant development after the onset of substorms; it tends to decay after the onset rather than to develop. It is suggested by a simple model calculation that the decay of the magnetospheric tail current after substorm onset is responsible for the decay of the Dst field. The relation between the IMF southward turning and the development of the Dst field is re-examined. The results support the idea that the geomagnetic storms and substorms are independent processes; that is, the ring-current development is not the result of the frequent occurrence of substorms, but that of enhanced convection caused by the large southward IMF. A substorm is the process of energy dissipation in the magnetosphere, and its contribution to the storm-time ring-current formation seems to be negligible. The decay of the Dst field after a substorm onset is explained by a magnetospheric energy theorem.

Collisional drift fluid equations and implications for drift waves

1996 ◽  
Vol 38 (1) ◽  
pp. 71-101 ◽  
Author(s):  
Dieter Pfirsch ◽  
Darío Correa-Restrepo
Keyword(s):  
Drift Waves ◽  
Fluid Equations

High frequency drift waves with wavelengths below the ion gyroradius in equatorial spread F

1978 ◽  
Vol 5 (8) ◽  
pp. 695-698 ◽  
Author(s):  
J. D. Huba ◽  
P. K. Chaturvedi ◽  
S. L. Ossakow ◽  
D. M. Towle
Keyword(s):  
High Frequency ◽  
Frequency Drift ◽  
Drift Waves ◽  
Equatorial Spread F ◽  
Spread F

On the three-dimensional magnetic structure of the plasmoid created in the magnetotail at substorm onset

1982 ◽  
Vol 9 (3) ◽  
pp. 203-206 ◽  
Author(s):  
E. W. Hones ◽  
J. Birn ◽  
S. J. Bame ◽  
G. Paschmann ◽  
C. T. Russell
Keyword(s):  
Magnetic Structure ◽  
Three Dimensional ◽  
Substorm Onset

Damping of drift waves

1972 ◽  
Vol 11 (1) ◽  
pp. 50-53
Author(s):  
R. K. Mazitov
Keyword(s):  
Drift Waves

Near-Earth substorm onset: A coordinated study

1994 ◽  
Vol 21 (17) ◽  
pp. 1875-1878 ◽  
Author(s):  
M. A. L. Persson ◽  
H. J. Opgenoorth ◽  
T. I. Pulkkinen ◽  
A. I. Eriksson ◽  
P. O. Dovner ◽  
...  
Keyword(s):  
Substorm Onset

Theory of finite-β-modified drift waves

1978 ◽  
Vol 18 (10) ◽  
pp. 1371-1378 ◽  
Author(s):  
L. Chen ◽  
J. Hsu ◽  
P.K. Kaw ◽  
P.H. Rutherford
Keyword(s):  
Drift Waves
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