scholarly journals The Role of Current Sheet Scattering in the Proton Isotropic Boundary Formation During Geomagnetic Storms

2019 ◽  
Vol 124 (5) ◽  
pp. 3468-3486
Author(s):  
John D. Haiducek ◽  
Natalia Y. Ganushkina ◽  
Stepan Dubyagin ◽  
Daniel T. Welling
Keyword(s):  
Current Sheet ◽  
Geomagnetic Storms ◽  
Boundary Formation

scholarly journals Concurrent effect of Alfvén waves and planar magnetic structure on geomagnetic storms

2019 ◽  
Vol 490 (3) ◽  
pp. 3440-3447 ◽  
Author(s):  
Zubair I Shaikh ◽  
Anil Raghav ◽  
Geeta Vichare ◽  
Ankush Bhaskar ◽  
Wageesh Mishra ◽  
...  
Keyword(s):  
Magnetic Structure ◽  
Geomagnetic Storms ◽  
Recovery Phase ◽  
Alfven Waves ◽  
Magnetic Clouds ◽  
Alfvén Waves ◽  
Fast Recovery ◽  
Interplanetary Coronal Mass Ejection ◽  
Mass Ejection

ABSTRACT Generally, interplanetary coronal mass ejection (ICME) triggers intense and strong geomagnetic storms. It has been established that the ICME sheath-moulded planar magnetic structure enhances the amplitude of the storms. Alfvén waves embedded in ICME magnetic clouds or high solar streams including corotating interacting regions (CIRs) in turn extend the recovery phase of the storm. Here, we investigate a geomagnetic storm with a very complex temporal profile with multiple decreasing and recovery phases. We examine the role of planar magnetic structure (PMS) and Alfvén waves in the various phases of the storm. We find that fast decrease and fast recovery phases are evident during transit of PMS regions, whereas a slight decrease or recovery is found during the transit of regions embedded with Alfvénic fluctuations.

scholarly journals Relativistic filamentary equilibria

2010 ◽  
Vol 77 (2) ◽  
pp. 193-205 ◽  
Author(s):  
M. GEDALIN ◽  
A. SPITKOVSKY ◽  
M. MEDVEDEV ◽  
M. BALIKHIN ◽  
V. KRASNOSELSKIKH ◽  
...  
Keyword(s):  
Current Sheet ◽  
Inertial Confinement Fusion ◽  
Nonlinear Evolution ◽  
Analytical Description ◽  
Inertial Confinement ◽  
Collisionless Shocks ◽  
Confinement Fusion ◽  
Linear And Nonlinear ◽  
Periodic Current

AbstractPlasma filamentation is often encountered in collisionless shocks and inertial confinement fusion. We develop a general analytical description of the two-dimensional relativistic filamentary equilibrium and derive the conditions for existence of potential-free equilibria. A pseudopotential equation for the vector-potential is constructed for cold and relativistic Maxwellian distributions. The role of counter-streaming is explained. We present single current sheet and periodic current sheet solutions, and analyze the equilibria with electric potential. These solutions can be used to study linear and nonlinear evolution of the relativistic filamentation instability.

scholarly journals Role of filament plasma remnants in ICMEs leading to geomagnetic storms

2013 ◽  
Vol 8 (S300) ◽  
pp. 493-494 ◽  
Author(s):  
Rahul Sharma ◽  
Nandita Srivastava ◽  
D. Chakrabarty
Keyword(s):  
Electric Field ◽  
Geomagnetic Storms ◽  
Interplanetary Coronal Mass Ejections ◽  
Plasma Dynamics ◽  
Terrestrial Magnetosphere ◽  
Auroral Substorms ◽  
Polarity Reversals ◽  
Ionospheric Electric Field ◽  
Filament Plasma

AbstractWe studied three interplanetary coronal mass ejections associated with solar eruptive filaments. Filament plasma remnants embedded in these structures were identified using plasma, magnetic and compositional signatures. These features when impacted the Earth's terrestrial magnetosphere - ionosphere system, resulted in geomagnetic storms. During the main phase of associated storms, along with high density plasma structures, polarity reversals in the Y-component (dawn-to-dusk) of the interplanetary electric field seem to trigger major auroral substorms with concomitant changes in the polar ionospheric electric field. Here, we examine the cases where plasma dynamics and magnetic structuring in the presence of the prompt penetration of the electric field into the equatorial ionosphere affected the space weather while highlighting the complex geomagnetic storm-substorm relationship.

scholarly journals Additional stratifications in the equatorialFregion at dawn and dusk during geomagnetic storms: Role of electrodynamics

2009 ◽  
Vol 114 (A8) ◽  
pp. n/a-n/a ◽  
Author(s):  
V. Sreeja ◽  
N. Balan ◽  
Sudha Ravindran ◽  
Tarun Kumar Pant ◽  
R. Sridharan ◽  
...  
Keyword(s):  
Geomagnetic Storms

scholarly journals Role of radial glia in cytogenesis, patterning and boundary formation in the developing spinal cord

2005 ◽  
Vol 207 (3) ◽  
pp. 241-250 ◽  
Author(s):  
Kieran W. McDermott ◽  
Denis S. Barry ◽  
Siobhan S. McMahon
Keyword(s):  
Spinal Cord ◽  
Radial Glia ◽  
Boundary Formation ◽  
Developing Spinal Cord

scholarly journals Role of Cu film texture in grain growth correlated with twin boundary formation

2012 ◽  
Vol 60 (2) ◽  
pp. 588-595 ◽  
Author(s):  
Kazuyuki Kohama ◽  
Kazuhiro Ito ◽  
Takuya Matsumoto ◽  
Yasuharu Shirai ◽  
Masanori Murakami
Keyword(s):  
Grain Growth ◽  
Twin Boundary ◽  
Boundary Formation ◽  
Cu Film

scholarly journals The role of streamers in the deflection of coronal mass ejections

2011 ◽  
Vol 7 (S286) ◽  
pp. 134-138
Author(s):  
F. P. Zuccarello ◽  
A. Bemporad ◽  
C. Jacobs ◽  
M. Mierla ◽  
S. Poedts ◽  
...  
Keyword(s):  
Current Sheet ◽  
Three Dimensional ◽  
Heliospheric Current Sheet ◽  
Field Of View ◽  
Physical Explanation ◽  
Filament Eruption ◽  
Mhd Simulations ◽  
Radial Evolution ◽  
Mass Ejection

AbstractOn 2009 September 21, a filament eruption and the associated Coronal Mass Ejection (CME) was observed by the STEREO spacecraft. The CME originated from the southern hemisphere and showed a deflection of about 15° towards the heliospheric current sheet (HCS) during its propagation in the COR1 field-of-view (FOV). The aim of this paper is to provide a physical explanation for the strong deflection of the CME. We first use the STEREO observations in order to reconstruct the three dimensional (3D) trajectory of the CME. Starting from a magnetic configuration that closely resembles the potential field extrapolation for that date, we performed numerical magneto-hydrodynamics (MHD) simulations. By applying localized shearing motions, a CME is initiated in the simulation, showing a similar non-radial evolution, structure, and velocity as the observed event. The CME gets deflected towards the current sheet of the larger northern helmet streamer, due to an imbalance in the magnetic pressure and tension forces and finally it gets into the streamer and propagates along the heliospheric current sheet.

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