Effect of temporal variation rate of cross polar cap potential on the equatorial ionospheric vertical drift: A statistical study

2012 ◽  
Vol 55 (5) ◽  
pp. 1217-1223 ◽  
Author(s):  
Wen Xiong ◽  
JiSheng Xu ◽  
Hui Wang ◽  
Liang Xu
Keyword(s):  
Temporal Variation ◽  
Statistical Study ◽  
Polar Cap ◽  
Vertical Drift ◽  
Variation Rate ◽  
Cross Polar Cap Potential

scholarly journals Statistical study of the subauroral polarization stream: Its dependence on the cross-polar cap potential and subauroral conductance

2008 ◽  
Vol 113 (A12) ◽  
pp. n/a-n/a ◽  
Author(s):  
Hui Wang ◽  
Aaron J. Ridley ◽  
Hermann Lühr ◽  
Michael W. Liemohn ◽  
Shu Y. Ma
Keyword(s):  
Statistical Study ◽  
Polar Cap ◽  
The Cross ◽  
Cross Polar Cap Potential

scholarly journals Statistical study of the effect of ULF fluctuations in the IMF on the cross polar cap potential drop for northward IMF

2011 ◽  
Vol 116 (A10) ◽  
pp. n/a-n/a ◽  
Author(s):  
H.-J. Kim ◽  
L. Lyons ◽  
A. Boudouridis ◽  
V. Pilipenko ◽  
A. J. Ridley ◽  
...  
Keyword(s):  
Statistical Study ◽  
Potential Drop ◽  
Polar Cap ◽  
The Cross ◽  
Cross Polar Cap Potential ◽  
The Imf

scholarly journals Deep Learning Models for Estimation of the SuperDARN Cross Polar Cap Potential

2020 ◽  
Vol 7 (8) ◽  
Author(s):  
Erxiao Liu ◽  
Hongqiao Hu ◽  
Jianjun Liu ◽  
Lei Qiao
Keyword(s):  
Deep Learning ◽  
Learning Models ◽  
Polar Cap ◽  
Cross Polar Cap Potential

Predicting SuperDARN cross polar cap potential by applying regression analysis and machine learning

2019 ◽  
Vol 193 ◽  
pp. 105057 ◽  
Author(s):  
Erxiao Liu ◽  
Hongqiao Hu ◽  
Jianjun Liu ◽  
Xuyang Teng ◽  
Lei Qiao
Keyword(s):  
Machine Learning ◽  
Regression Analysis ◽  
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 Dayside and nightside contributions to the cross polar cap potential: placing an upper limit on a viscous-like interaction

2004 ◽  
Vol 22 (10) ◽  
pp. 3771-3777 ◽  
Author(s):  
S. E. Milan
Keyword(s):  
Magnetic Flux ◽  
Polar Regions ◽  
Polar Cap ◽  
Average Decrease ◽  
The Past ◽  
Viscous Interaction ◽  
The North ◽  
Upper Limit ◽  
The Cross ◽  
Cross Polar Cap Potential

Abstract. Observations of changes in size of the ionospheric polar cap allow the dayside and nightside reconnection rates to be quantified. From these it is straightforward to estimate the rate of antisunward transport of magnetic flux across the polar regions, quantified by the cross polar cap potential ΦPC. When correlated with upstream measurements of the north-south component of the IMF, ΦPC is found to increase for more negative Bz, as expected. However, we also find that ΦPC does not, on average, decrease to zero, even for strongly northward IMF. In the past this has been interpreted as evidence for a viscous interaction between the magnetosheath flow and the outer boundaries of the magnetosphere. In contrast, we show that this is the consequence of flows excited by tail reconnection, which is inherently uncorrelated with IMF Bz.

Polar airglow and aurora

1991 ◽  
Vol 69 (8-9) ◽  
pp. 1055-1058 ◽  
Author(s):  
D. J. McEwen ◽  
D. A. Harrington
Keyword(s):  
Magnetic Field ◽  
Statistical Study ◽  
Geomagnetic Latitude ◽  
Great Variability ◽  
Electron Precipitation ◽  
Polar Cap ◽  
Winter Solstice ◽  
Latitude Range ◽  
Precipitation Occurrence ◽  
Airglow Emissions

A survey of night airglow emissions in the polar cap shows stable emission intensities during quiet periods through the winter solstice. Those affected by particle precipitation, OI λ5577 and λ6300, show great variability with solar activity and the state of the interplanetary magnetic field. A statistical study of electron-precipitation occurrence above 78° geomagnetic latitude shows events sufficient to result in observable enhancements in OI emission intensities in about 40% of the satellite passes in the magnetic latitude range from 79° to 83° and in about 15% of the passes for latitudes above 85°. This study provides the necessary background for dynamical studies of polar processes in the planned Canadian polar observatory.

Sign in / Sign up

Export Citation Format

Share Document