The effects of field line curvature (FLC) scattering on ring current dynamics and ionospheric electrodynamics

2020 ◽  
Author(s):  
Yiqun Yu ◽  
Xingbin Tian ◽  
Vania K. Jordanova
Keyword(s):  
Field Line ◽  
Ring Current ◽  
Ionospheric Electrodynamics

scholarly journals Magnetosonic resonance in a dipole-like magnetosphere

2006 ◽  
Vol 24 (8) ◽  
pp. 2277-2289 ◽  
Author(s):  
A. S. Leonovich ◽  
D. A. Kozlov ◽  
V. A. Pilipenko
Keyword(s):  
Magnetic Field ◽  
Field Line ◽  
Ring Current ◽  
Effective Interaction ◽  
Field Line Resonance ◽  
Line Resonance ◽  
Field Lines

Abstract. A theory of resonant conversion of fast magnetosonic (FMS) waves into slow magnetosonic (SMS) oscillations in a magnetosphere with dipole-like magnetic field has been constructed. Monochromatic FMS waves are shown to drive standing (along magnetic field lines) SMS oscillations, narrowly localized across magnetic shells. The longitudinal and transverse structures, as well as spectrum of resonant SMS waves are determined. Frequencies of fundamental harmonics of standing SMS waves lie in the range of 0.1–1 mHz, and are about two orders of magnitude lower than frequencies of similar Alfvén field line resonance harmonics. This difference makes an effective interaction between these MHD modes impossible. The amplitude of SMS oscillations rapidly decreases along the field lines from the magnetospheric equator towards the ionosphere. In this context, magnetospheric SMS oscillations cannot be observed on the ground, and the ionosphere does not play any role either in their generation or dissipation. The theory developed can be used to interpret the occurrence of compressional Pc5 waves in a quiet magnetosphere with a weak ring current.

scholarly journals The Effects of Field Line Curvature (FLC) Scattering on Ring Current Dynamics and Isotropic Boundary

2020 ◽  
Vol 125 (8) ◽  
Author(s):  
Yiqun Yu ◽  
Xingbin Tian ◽  
Vania K. Jordanova
Keyword(s):  
Field Line ◽  
Ring Current

Field-line (Euler-potential) model of the ring current

2008 ◽  
Vol 70 (2-4) ◽  
pp. 482-489 ◽  
Author(s):  
Michael Schulz ◽  
Margaret W. Chen
Keyword(s):  
Field Line ◽  
Ring Current ◽  
Potential Model

scholarly journals Variations of Field Line Eigenfrequencies With Ring Current Intensity

2018 ◽  
Vol 123 (11) ◽  
pp. 9325-9339 ◽  
Author(s):  
J. K. Sandhu ◽  
T. K. Yeoman ◽  
I. J. Rae
Keyword(s):  
Field Line ◽  
Ring Current ◽  
Current Intensity

scholarly journals Rapid decay of storm time ring current due to pitch angle scattering in curved field line

2011 ◽  
Vol 116 (A3) ◽  
Author(s):  
Y. Ebihara ◽  
M.-C. Fok ◽  
T. J. Immel ◽  
P. C. Brandt
Keyword(s):  
Field Line ◽  
Pitch Angle ◽  
Ring Current ◽  
Rapid Decay ◽  
Angle Scattering

Evolution of Large-Scale Coronal Structures

1994 ◽  
Vol 144 ◽  
pp. 29-33
Author(s):  
P. Ambrož
Keyword(s):  
Magnetic Field ◽  
Field Line ◽  
Large Scale ◽  
Coronal Magnetic Field ◽  
Source Surface ◽  
Solar Cycles ◽  
Characteristic Relationship ◽  
The Magnetic Field ◽  
Coronal Structures

AbstractThe large-scale coronal structures observed during the sporadically visible solar eclipses were compared with the numerically extrapolated field-line structures of coronal magnetic field. A characteristic relationship between the observed structures of coronal plasma and the magnetic field line configurations was determined. The long-term evolution of large scale coronal structures inferred from photospheric magnetic observations in the course of 11- and 22-year solar cycles is described.Some known parameters, such as the source surface radius, or coronal rotation rate are discussed and actually interpreted. A relation between the large-scale photospheric magnetic field evolution and the coronal structure rearrangement is demonstrated.

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