scholarly journals Ionospheric signatures of a plasma sheet rebound flow during a substorm onset

2013 ◽  
Vol 118 (1) ◽  
pp. 350-363 ◽  
Author(s):  
L. Juusola ◽  
M. Kubyshkina ◽  
R. Nakamura ◽  
T. Pitkänen ◽  
O. Amm ◽  
...  
Keyword(s):  
Plasma Sheet ◽  
Substorm Onset

scholarly journals Correlation between ground-based observations of substorm signatures and magnetotail dynamics

2005 ◽  
Vol 23 (3) ◽  
pp. 997-1011 ◽  
Author(s):  
E. Borälv ◽  
H. J. Opgenoorth ◽  
K. Kauristie ◽  
M. Lester ◽  
J.-M. Bosqued ◽  
...  
Keyword(s):  
Solar Wind ◽  
Event Study ◽  
Plasma Sheet ◽  
Sheet Thickness ◽  
Substorm Onset ◽  
Boundary Motion ◽  
Thickness Variations ◽  
Magnetotail Dynamics

Abstract. We present a substorm event study using the four Cluster spacecraft in combination with ground-based instruments, in order to perform simultaneous observations in the ionosphere and magnetotail. We show good correlation between substorm signatures on the ground and in the magnetotail, even though data from the northern-ground and southern-tail hemispheres are compared. During this event ground-based magnetometers show a substorm onset over Scandinavia in the pre-midnight sector. Within 1.5h the onset and three intensifications are apparent in the magnetograms. For all the substorm signatures seen on the ground, corresponding plasma sheet boundary motion is visible at Cluster, located at a downtail distance of 18.5 RE. As a result of the substorm onset and intensifications, Cluster moves in and out between the southern plasma sheet and lobe. Due to the lack of an apparent solar wind driver and the good correlation between substorm signatures on the ground, we conclude the substorm itself is the driver for these plasma sheet dynamics. We show that in the scales of Cluster inter-spacecraft distances (~0.5 RE) the inferred plasma sheet motion is often directed in both Ygsm- and Zgsm-directions, and discuss this finding in the context of previous studies of tail flapping and plasma sheet thickness variations.

Nonadiabatic heating of the central plasma sheet at substorm onset

1992 ◽  
Vol 97 (A2) ◽  
pp. 1481 ◽  
Author(s):  
C. Y. Huang ◽  
L. A. Frank ◽  
G. Rostoker ◽  
J. Fennell ◽  
D. G. Mitchell
Keyword(s):  
Plasma Sheet ◽  
Substorm Onset ◽  
Central Plasma ◽  
Central Plasma Sheet

scholarly journals Enhanced transport across entire length of plasma sheet boundary field lines leading to substorm onset

2010 ◽  
Vol 115 (A5) ◽  
pp. n/a-n/a ◽  
Author(s):  
L. R. Lyons ◽  
Y. Nishimura ◽  
X. Xing ◽  
V. Angelopoulos ◽  
S. Zou ◽  
...  
Keyword(s):  
Plasma Sheet ◽  
Substorm Onset ◽  
Entire Length ◽  
Boundary Field ◽  
Field Lines

scholarly journals Near-Earth plasma sheet azimuthal pressure gradient and associated auroral development soon before substorm onset

2011 ◽  
Vol 116 (A7) ◽  
pp. n/a-n/a ◽  
Author(s):  
X. Xing ◽  
L. R. Lyons ◽  
Y. Nishimura ◽  
V. Angelopoulos ◽  
E. Donovan ◽  
...  
Keyword(s):  
Pressure Gradient ◽  
Plasma Sheet ◽  
Substorm Onset

A multisatellite study of the plasma sheet dynamics at substorm onset

1984 ◽  
Vol 11 (5) ◽  
pp. 500-503 ◽  
Author(s):  
J. A. Sauvaud ◽  
A. Saint-Marc ◽  
J. Dandouras ◽  
H. Rème ◽  
A. Korth ◽  
...  
Keyword(s):  
Plasma Sheet ◽  
Substorm Onset

scholarly journals Transition from substorm growth to substorm expansion phase as observed with a radial configuration of ISTP and Cluster spacecraft

2005 ◽  
Vol 23 (6) ◽  
pp. 2183-2198 ◽  
Author(s):  
V. A. Sergeev ◽  
M. V. Kubyshkina ◽  
W. Baumjohann ◽  
R. Nakamura ◽  
O. Amm ◽  
...  
Keyword(s):  
Transition Region ◽  
Growth Phase ◽  
Plasma Sheet ◽  
Magnetic Energy ◽  
Global Scale ◽  
Substorm Onset ◽  
Plasma Injection ◽  
Storms And Substorms ◽  
Auroral Phenomena ◽  
Inner Region

Abstract. Transition from the growth phase to the substorm expansion during a well-isolated substorm with a strong growth phase is investigated using a unique radial (THEMIS-like) spacecraft constellation near midnight, including the probing of the tail current at ~16 RE with Cluster, of the transition region at ~9 RE with Geotail and Polar, and of the inner region at 6.6 RE with two LANL spacecraft. The activity development on both a global scale and near the spacecraft footpoints was monitored with global auroral images (from the IMAGE spacecraft) and the ground network. Magnetospheric models, tuned using in-situ observations, indicated a strong tail stretching and plasma sheet thinning, which included the growth of the near-Earth current (approaching 30 nA/m2) and possible formation of a local B minimum in the neutral sheet (~5 nT) at ~10–12 RE near the substorm onset. However, there were no indications that the substorm onset was initiated just in this region. We emphasize the rather weak magnetic and plasma flow perturbations observed outside the thinned plasma sheet at Cluster, which could be interpreted as the effects of localized earthward-contracting newly-reconnected plasma tubes produced by the impulsive reconnection in the midtail plasma sheet. In that case the time delays around the distinct substorm onset are consistent with the activity propagation from the midtail to the inner magnetosphere. A peculiar feature of this substorm was that 12min prior to this distinct onset, a clear soft plasma injection to the GEO orbit was recorded which has little associated effects both in the ionosphere and in the transition region at ~9 RE. This pseudo-breakup was probably due to either a localized ballooning-type activity or due to the braking of a very narrow BBF whose signatures were also recorded by Cluster. This event manifested the (previously unknown) phenomenon, a strong tail overloading (excessive storage of magnetic energy) contrasted to the modest energy dissipation and plasma acceleration, which are both discussed and interpreted as the consequences of cold/dense and thick pre-substorm plasma sheet which often occurs after the long quiet period. The lessons of using the radial spacecraft configurations in substorm onset studies are also discussed. Keywords. Magnetospheric physics (Auroral phenomena, plasma sheet, storms and substorms)

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