scholarly journals Large-amplitude electric fields in the inner magnetosphere: Van Allen Probes observations of subauroral polarization streams

2016 ◽  
Vol 121 (6) ◽  
pp. 5294-5306 ◽  
Author(s):  
S. Califf ◽  
X. Li ◽  
R. A. Wolf ◽  
H. Zhao ◽  
A. N. Jaynes ◽  
...  
Keyword(s):  
Electric Fields ◽  
Large Amplitude ◽  
Inner Magnetosphere ◽  
Van Allen Probes

scholarly journals Generation Process of Large-Amplitude Upper-Band Chorus Emissions Observed by Van Allen Probes

2018 ◽  
Vol 123 (5) ◽  
pp. 3704-3713 ◽  
Author(s):  
Yuko Kubota ◽  
Yoshiharu Omura ◽  
Craig Kletzing ◽  
Geoffrey Reeves
Keyword(s):  
Large Amplitude ◽  
Generation Process ◽  
Van Allen Probes

scholarly journals Coupled rotational dynamics of Jupiter's thermosphere and magnetosphere

2009 ◽  
Vol 27 (1) ◽  
pp. 199-230 ◽  
Author(s):  
C. G. A. Smith ◽  
A. D. Aylward
Keyword(s):  
Angular Momentum ◽  
Momentum Transfer ◽  
Electric Fields ◽  
Joule Heating ◽  
Rotational Dynamics ◽  
High Latitudes ◽  
Inner Magnetosphere ◽  
Angular Momentum Transfer ◽  
Simple Physical Model ◽  
Low Latitudes

Abstract. We describe an axisymmetric model of the coupled rotational dynamics of the thermosphere and magnetosphere of Jupiter that incorporates self-consistent physical descriptions of angular momentum transfer in both systems. The thermospheric component of the model is a numerical general circulation model. The middle magnetosphere is described by a simple physical model of angular momentum transfer that incorporates self-consistently the effects of variations in the ionospheric conductivity. The outer magnetosphere is described by a model that assumes the existence of a Dungey cycle type interaction with the solar wind, producing at the planet a largely stagnant plasma flow poleward of the main auroral oval. We neglect any decoupling between the plasma flows in the magnetosphere and ionosphere due to the formation of parallel electric fields in the magnetosphere. The model shows that the principle mechanism by which angular momentum is supplied to the polar thermosphere is meridional advection and that mean-field Joule heating and ion drag at high latitudes are not responsible for the high thermospheric temperatures at low latitudes on Jupiter. The rotational dynamics of the magnetosphere at radial distances beyond ~30 RJ in the equatorial plane are qualitatively unaffected by including the detailed dynamics of the thermosphere, but within this radial distance the rotation of the magnetosphere is very sensitive to the rotation velocity of the thermosphere and the value of the Pedersen conductivity. In particular, the thermosphere connected to the inner magnetosphere is found to super-corotate, such that true Pedersen conductivities smaller than previously predicted are required to enforce the observed rotation of the magnetosphere within ~30 RJ. We find that increasing the Joule heating at high latitudes by adding a component due to rapidly fluctuating electric fields is unable to explain the high equatorial temperatures. Adding a component of Joule heating due to fluctuations at low latitudes is able to explain the high equatorial temperatures, but the thermospheric wind systems generated by this heating cause super-corotation of the inner magnetosphere in contradiction to the observations. We conclude that the coupled model is a particularly useful tool for study of the thermosphere as it allows us to constrain the plausibility of predicted thermospheric structures using existing observations of the magnetosphere.

scholarly journals Magnetospheric convection electric field dynamics andstormtime particle energization: case study of the magneticstorm of 4 May 1998

2004 ◽  
Vol 22 (2) ◽  
pp. 497-510 ◽  
Author(s):  
G. V. Khazanov ◽  
M. W. Liemohn ◽  
T. S. Newman ◽  
M.-C. Fok ◽  
A. J. Ridley
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Transport Model ◽  
Storm Event ◽  
Inner Magnetosphere ◽  
Narrow Channels ◽  
Near Earth Space ◽  
Magnetospheric Convection ◽  
Convection Electric Field ◽  
Seed Population

Abstract. It is shown that narrow channels of high electric field are an effective mechanism for injecting plasma into the inner magnetosphere. Analytical expressions for the electric field cannot produce these channels of intense plasma flow, and thus, result in less entry and adiabatic energization of the plasma sheet into near-Earth space. For the ions, omission of these channels leads to an underprediction of the strength of the stormtime ring current and therefore, an underestimation of the geoeffectiveness of the storm event. For the electrons, omission of these channels leads to the inability to create a seed population of 10-100 keV electrons deep in the inner magnetosphere. These electrons can eventually be accelerated into MeV radiation belt particles. To examine this, the 1-7 May 1998 magnetic storm is studied with a plasma transport model by using three different convection electric field models: Volland-Stern, Weimer, and AMIE. It is found that the AMIE model can produce particle fluxes that are several orders of magnitude higher in the L = 2 – 4 range of the inner magnetosphere, even for a similar total cross-tail potential difference. Key words. Space plasma physics (charged particle motion and acceleration) – Magnetospheric physics (electric fields, storms and substorms)

scholarly journals Void structure of O+ ions in the inner magnetosphere observed by the Van Allen Probes

2016 ◽  
Vol 121 (12) ◽  
pp. 11,698-11,713 ◽  
Author(s):  
Y. Nakayama ◽  
Y. Ebihara ◽  
S. Ohtani ◽  
M. Gkioulidou ◽  
K. Takahashi ◽  
...  
Keyword(s):  
Inner Magnetosphere ◽  
Van Allen Probes ◽  
Void Structure

Large amplitude middle atmospheric electric fields: Fact or fiction?

1983 ◽  
Vol 10 (8) ◽  
pp. 733-736 ◽  
Author(s):  
M. C. Kelley ◽  
C. L. Siefring ◽  
R. F. Pfaff
Keyword(s):  
Electric Fields ◽  
Large Amplitude

Characteristics of Sudden Commencements Observed by Van Allen Probes in the Inner Magnetosphere

2018 ◽  
Vol 123 (2) ◽  
pp. 1295-1304
Author(s):  
A. Fathy ◽  
K.-H. Kim ◽  
J.-S. Park ◽  
H. Jin ◽  
C. Kletzing ◽  
...  
Keyword(s):  
Inner Magnetosphere ◽  
Van Allen Probes ◽  
Sudden Commencements

Solar wind control of the penetration of electric fields in the inner magnetosphere

2000 ◽  
Vol 25 (7-8) ◽  
pp. 1393-1396 ◽  
Author(s):  
Nelson C Maynard ◽  
William J Burke ◽  
Gordon R Wilson
Keyword(s):  
Solar Wind ◽  
Electric Fields ◽  
Inner Magnetosphere

scholarly journals Dynamical behavior of U-shaped double layers: cavity formation and filamentary structures

2005 ◽  
Vol 12 (6) ◽  
pp. 783-798 ◽  
Author(s):  
N. Singh ◽  
C. Deverapalli ◽  
A. Rajagiri ◽  
I. Khazanov
Keyword(s):  
Electric Fields ◽  
Large Amplitude ◽  
Electron Beams ◽  
Ion Beam ◽  
Plasma Heating ◽  
Dynamical Behavior ◽  
Ion Beams ◽  
Double Layers ◽  
Lower Hybrid ◽  
Ps Ii

Abstract. Observations from the Polar and FAST satellites have revealed a host of intriguing features of the auroral accelerations processes in the upward current region (UCR). These features include: (i) large-amplitude parallel ( ) and perpendicular () fluctuating as well as quasi-static electric fields in density cavities, (ii) fairly large-amplitude unipolar parallel electric fields like in a strong double layer (DL), (iii) variety of wave modes, (iv) counter-streaming of upward going ion beams and downward accelerated electrons, (v) horizontally corrugated bottom region of the potential structures (PS), in which electron and ion accelerations occur, (vi) filamentary ion beams in the corrugated PS, and (vii) both upward and downward moving narrow regions of parallel electric fields, inferred from the frequency drifts of the auroral kilometric radiations. Numerical simulations of U-shaped potential structures reveal that such observed features of the UCR are integral parts of dynamically evolving auroral U-shaped potential structures. Using a 2.5-D particle-in-cell (PIC) code we simulate a U-shaped broad potentialstructure (USBPS). The dynamical behavior revealed by the simulation includes: (i) recurring redistribution of the parallel potential drop (PPD) in the PS, (ii) its up and downward motion, (iii) formation of filaments in the potential and density structures, and (iv) creation of filamentary as well as broad extended density cavities. The formation of the filamentary structures is initiated by an ion-beam driven instability of an oblique ion mode trapped inside a broad cavity, when it becomes sufficiently thin in height. The filaments of the PS create filamentary electron beams, which generate waves at frequencies above the lower hybrid frequency, affecting plasma heating. This results in plasma evacuation and formation of a cavity extended in height. The waves associated with filamentary electron beams also evolve into electron holes. The transverse and parallel scale lengths of the regions with large and as well as their magnitudes are compared with satellite data.

scholarly journals Low‐Energy (

2019 ◽  
Vol 124 (1) ◽  
pp. 405-419 ◽  
Author(s):  
Matina Gkioulidou ◽  
S. Ohtani ◽  
A. Y. Ukhorskiy ◽  
D. G. Mitchell ◽  
K. Takahashi ◽  
...  
Keyword(s):  
Low Energy ◽  
Ion Outflow ◽  
Inner Magnetosphere ◽  
Van Allen Probes
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