scholarly journals Solar wind density controlling penetration electric field at the equatorial ionosphere during a saturation of cross polar cap potential

2012 ◽  
Vol 117 (A9) ◽  
pp. n/a-n/a ◽  
Author(s):  
Y. Wei ◽  
W. Wan ◽  
B. Zhao ◽  
M. Hong ◽  
A. Ridley ◽  
...  
Keyword(s):  
Solar Wind ◽  
Electric Field ◽  
Equatorial Ionosphere ◽  
Solar Wind Density ◽  
Polar Cap ◽  
Cross Polar Cap Potential

scholarly journals Effects of the solar wind electric field and ionospheric conductance on the cross polar cap potential: Results of global MHD modeling

2003 ◽  
Vol 30 (23) ◽  
pp. n/a-n/a ◽  
Author(s):  
V. G. Merkine ◽  
K. Papadopoulos ◽  
G. Milikh ◽  
A. S. Sharma ◽  
X. Shao ◽  
...  
Keyword(s):  
Solar Wind ◽  
Electric Field ◽  
Polar Cap ◽  
Mhd Modeling ◽  
The Cross ◽  
Cross Polar Cap Potential

scholarly journals The Role of Solar Wind Density in Cross Polar Cap Potential Saturation Under Northward Interplanetary Magnetic Field

2017 ◽  
Vol 44 (23) ◽  
pp. 11,729-11,734 ◽  
Author(s):  
Dong Lin ◽  
Binzheng Zhang ◽  
Wayne A. Scales ◽  
Michael Wiltberger ◽  
C. Robert Clauer ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Interplanetary Magnetic Field ◽  
Solar Wind Density ◽  
Polar Cap ◽  
Cross Polar Cap Potential

scholarly journals A new formulation for the ionospheric cross polar cap potential including saturation effects

2005 ◽  
Vol 23 (11) ◽  
pp. 3533-3547 ◽  
Author(s):  
A. J. Ridley
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Mach Number ◽  
Interplanetary Magnetic Field ◽  
Polar Cap ◽  
Pressure Balance ◽  
Simple Modification ◽  
Post Shock ◽  
Cross Polar Cap Potential ◽  
New Formulation

Abstract. It is known that the ionospheric cross polar cap potential (CPCP) saturates when the interplanetary magnetic field (IMF) Bz becomes very large. Few studies have offered physical explanations as to why the polar cap potential saturates. We present 13 events in which the reconnection electric field (REF) goes above 12mV/m at some time. When these events are examined as typically done in previous studies, all of them show some signs of saturation (i.e., over-prediction of the CPCP based on a linear relationship between the IMF and the CPCP). We show that by taking into account the size of the magnetosphere and the fact that the post-shock magnetic field strength is strongly dependent upon the solar wind Mach number, we can better specify the ionospheric CPCP. The CPCP (Φ) can be expressed as Φ=(10-4v2+11.7B(1-e-Ma/3)sin3(θ/2)) {rms/9 (where v is the solar wind velocity, B is the combined Y and Z components of the interplanetary magnetic field, Ma is the solar wind Mach number, θ=acos(Bz/B), and rms is the stand-off distance to the magnetopause, assuming pressure-balance between the solar wind and the magnetosphere). This is a simple modification of the original Boyle et al. (1997) formulation.

scholarly journals On the SuperDARN cross polar cap potential saturation effect

2009 ◽  
Vol 27 (10) ◽  
pp. 3755-3764 ◽  
Author(s):  
A. V. Koustov ◽  
G. Ya. Khachikjan ◽  
R. A. Makarevich ◽  
C. Bryant
Keyword(s):  
Electric Field ◽  
Linear Trend ◽  
Limited Data ◽  
Polar Cap ◽  
Data Set ◽  
Northern Summer ◽  
Radar Network ◽  
Cross Polar Cap Potential ◽  
Hemisphere Winter ◽  
Magnetic Index

Abstract. Variation of the cross polar cap potential (CPCP) with the interplanetary electric field (IEF), the merging electric field EKL, the Polar Cap North (PCN) magnetic index, and the solar wind-magnetosphere coupling function EC of Newell et al. (2007) is investigated by considering convection data collected by the Super Dual Auroral Radar Network (SuperDARN) in the Northern Hemisphere. Winter and summer observations are considered separately. All variations considered show close to linear trend at small values of the parameters and tendency for the saturation at large values. The threshold values starting from which the non-linearity was evident were estimated to be IEF*~EKL*~3 mV/m, PCN*~3–4, and EC*~1.5×104. The data indicate that saturation starts at larger values of the above parameters and reaches larger (up to 10 kV) saturation levels during summer. Conclusions are supported by a limited data set of simultaneous SuperDARN observations in the Northern (summer) and Southern (winter) Hemispheres. It is argued that the SuperDARN CPCP saturation levels and the thresholds for the non-linearity to be seen are affected by the method of the CPCP estimates.

Polar cap response to the solar wind density jump under constant southward IMF

2014 ◽  
Vol 54 (6) ◽  
pp. 702-711 ◽  
Author(s):  
E. S. Belenkaya ◽  
V. V. Kalegaev ◽  
M. S. Blokhina
Keyword(s):  
Solar Wind ◽  
Density Jump ◽  
Solar Wind Density ◽  
Polar Cap

scholarly journals An evidence for prompt electric field disturbance driven by changes in the solar wind density under northward IMF Bz condition

2016 ◽  
Vol 121 (5) ◽  
pp. 4800-4810 ◽  
Author(s):  
Diptiranjan Rout ◽  
D. Chakrabarty ◽  
R. Sekar ◽  
G. D. Reeves ◽  
J. M. Ruohoniemi ◽  
...  
Keyword(s):  
Solar Wind ◽  
Electric Field ◽  
Solar Wind Density ◽  
Field Disturbance

Polar cap electric field dependence on solar wind and magnetotail parameters

1981 ◽  
Vol 8 (12) ◽  
pp. 1261-1264 ◽  
Author(s):  
D. Longenecker ◽  
J. G. Roederer
Keyword(s):  
Solar Wind ◽  
Electric Field ◽  
Field Dependence ◽  
Polar Cap ◽  
Electric Field Dependence
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