Implications of the equipotential field line approximation for equatorial spread <i>F</i> analysis

Aveiro, H. C.; Hysell, D. L.

doi:10.1029/2012gl051971

Cited by 14 publications

(12 citation statements)

References 22 publications

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“…They also found that the same assumption leads to an underestimation of the growth rate of plasma irregularities in their simulation study. In the present work, we find that fringe fields are smaller at low latitudes than at the magnetic equator, and this finding possibly indicates that magnetic field lines during plasma bubble phenomenon are not equipotential as shown by Aveiro and Hysell []. Thus, it is quite likely that the reduced fringe field at low latitude as demonstrated in this work would possibly be insufficient to provide condition for generating irregularities in the valley region.…”

Section: Resultssupporting

confidence: 62%

Parallel plate capacitor analogy of equatorial plasma bubble and associated fringe fields with implications to equatorial valley region irregularities

Mukherjee

Patra

2014

JGR Space Physics

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VHF radar echoes from the valley region plasma irregularities, displaying ascending pattern, are often observed during the active phase of equatorial plasma bubble in the close vicinity of the geomagnetic equator and have been attributed to bubble-related fringe field effect. These irregularities however are not observed at a few degrees away from the equator. In this paper, we attempt to understand this contrasting observational result by comparing fringe field at the geomagnetic equator and low latitudes. We use parallel plate capacitor analogy of equatorial plasma bubble and choose a few capacitor configurations, consistent with commonly observed dimension and magnetic field-aligned property of plasma bubble, for computing fringe field. Results show that fringe field decreases significantly with decreasing altitude as expected. Further, fringe field decreases remarkably with latitude, which clearly indicates the role of magnetic field-aligned property of plasma bubble in reducing the magnitude of fringe field at low latitudes compared to that at the geomagnetic equator. The results are presented and discussed in the light of current understanding of plasma bubble-associated fringe field-induced plasma irregularities in the valley region.

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Section: Resultssupporting

confidence: 62%

Parallel plate capacitor analogy of equatorial plasma bubble and associated fringe fields with implications to equatorial valley region irregularities

Mukherjee

Patra

2014

JGR Space Physics

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“…Guzdar et al , ]. Recent studies of other gradient‐generated instabilities (e.g., gravitational Rayleigh‐Taylor (GRTI)) have employed three‐dimensional potential solutions, with fewer cells than used here and suggested differences from a field‐integrated formulation [ Keskinen et al , ; Aveiro and Hysell , ; Hysell et al , ]. Other studies indicate that the GRTI growth rates may not be greatly affected by a field‐integrated formulation, but the details of the structures formed by the instabilities differ somewhat [ Aveiro and Huba , ].…”

Section: Modeling Approachmentioning

confidence: 99%

Dynamics of density cavities generated by frictional heating: Formation, distortion, and instability

Zettergren

Semeter

Dahlgren

2015

Geophysical Research Letters

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A simulation study of the generation and evolution of mesoscale density cavities in the polar ionosphere is conducted using a time‐dependent, nonlinear, quasi‐electrostatic model. The model demonstrates that density cavities, generated by frictional heating, can form in as little as 90 s due to strong electric fields of ∼120 mV/m, which are sometimes observed near auroral zone and polar cap arcs. Asymmetric density cavity features and strong plasma density gradients perpendicular to the geomagnetic field are naturally generated as a consequence of the strong convection and finite extent of the auroral feature. The walls of the auroral density cavities are shown to be susceptible to large‐scale distortion and gradient‐drift instability, hence indicating that arc‐related regions of frictional heating may be a source of polar ionospheric density irregularities.

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“…) The E region plasma was not fully dynamic. It should not respond to F region electrodynamic structures [ Doles et al ., ], which might produce modifications to its conductance patterns, leading to changes in the F region dynamic. We used a 2‐D electrostatic potential, assuming that the geomagnetic field lines were equipotentials [ Aveiro and Hysell , ]. This meant that the electrodynamic effect of a low‐altitude cloud was assumed to map perfectly along field lines; the actual mapping effectiveness could be reduced or different.…”

Section: Discussionmentioning

confidence: 99%

“…4. We used a 2-D electrostatic potential, assuming that the geomagnetic field lines were equipotentials [Aveiro and Hysell, 2012]. This meant that the electrodynamic effect of a low-altitude cloud was assumed to map perfectly along field lines; the actual mapping effectiveness could be reduced or different.…”

Section: Discussionmentioning

confidence: 99%

The electrodynamic effects of MOSC‐like plasma clouds

et al. 2017

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The effects on the plasma/electrodynamic environment in the low‐latitude ionosphere produced by the artificial plasma clouds created in the Metal Oxide Space Cloud (MOSC) experiment are studied via simulations. The electric fields and plasma flow in the vicinity of the cloud are calculated using its estimated field‐line‐integrated conductance; it is found that the “comma‐like” flow around the cloud seen in the ALTAIR (Advanced Research Project Agency [ARPA] Long‐range Tracking and Identification Radar) observations can be explained by the perturbations to the electric field produced by the conductance gradients around the cloud. Next, the conductance is introduced into a simulation of the development of the Rayleigh‐Taylor instability. The simulations suggest that a moderately denser cloud than the MOSC cloud, closer to the bottom edge of the F layer, could indeed suppress the development of the low‐density plumes and the shorter‐wavelength irregularities associated with radio scintillation that form with the Rayleigh‐Taylor instability in the low‐latitude ionosphere.

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Implications of the equipotential field line approximation for equatorial spread F analysis

Cited by 14 publications

References 22 publications

Parallel plate capacitor analogy of equatorial plasma bubble and associated fringe fields with implications to equatorial valley region irregularities

Parallel plate capacitor analogy of equatorial plasma bubble and associated fringe fields with implications to equatorial valley region irregularities

Dynamics of density cavities generated by frictional heating: Formation, distortion, and instability

The electrodynamic effects of MOSC‐like plasma clouds

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