Fringe field dynamics over equatorial and low‐latitude ionosphere: A three‐dimensional perspective

Kherani, E. A.; Patra, Amit

doi:10.1002/2015ja021438

Cited by 8 publications

(12 citation statements)

References 12 publications

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“…These features can explain why valley-type irregularities are not observed in the RTI maps from VHF radar observations at low latitudes (Patra and Venkateswara Rao, 2007;Mukherjee and Patra, 2014). Also, Kherani and Patra (2015) explained the electrodynamic origin of the asymmetries noted in the raising structures (Fig. 8) in the E and F valley regions.…”

Section: Langmuir Probe Measurementsmentioning

confidence: 71%

“…More recently, Kherani and Patra (2015) showed that the fringe field associated with large-scale irregularities penetrates only within the bell of ±5 • from the magnetic equator. These features can explain why valley-type irregularities are not observed in the RTI maps from VHF radar observations at low latitudes (Patra and Venkateswara Rao, 2007;Mukherjee and Patra, 2014).…”

Section: Langmuir Probe Measurementsmentioning

confidence: 99%

“…This leads to numerous studies (e.g., Alam Mukherjee and Patra, 2014;Kherani and Patra, 2015) aiming to understand the physical origin of this valleytype plasma irregularity through the possible link with the fringe field (polarization field) of F irregularities.…”

Section: Langmuir Probe Measurementsmentioning

confidence: 99%

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Rocket in situ observation of equatorial plasma irregularities in the region between E and F layers over Brazil

Savio¹,

Meneses²,

Muralikrishna³

et al. 2017

Ann. Geophys.

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Abstract. A two-stage VS-30 Orion rocket was launched from the equatorial rocket launching station in Alcântara, Brazil, on 8 December 2012 soon after sunset (19:00 LT), carrying a Langmuir probe operating alternately in swept and constant bias modes. At the time of launch, ground equipment operated at equatorial stations showed rapid rise in the base of the F layer, indicating the pre-reversal enhancement of the F region vertical drift and creating ionospheric conditions favorable for the generation of plasma bubbles. Vertical profiles of electron density estimated from Langmuir probe data showed wave patterns and small-and mediumscale plasma irregularities in the valley region (100-300 km) during the rocket upleg and downleg. These irregularities resemble those detected by the very high frequency (VHF) radar installed at Jicamarca and so-called equatorial quasiperiodic echoes. We present evidence suggesting that these observations could be the first detection of this type of irregularity made by instruments onboard a rocket.

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Section: Langmuir Probe Measurementsmentioning

confidence: 71%

Section: Langmuir Probe Measurementsmentioning

confidence: 99%

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Rocket in situ observation of equatorial plasma irregularities in the region between E and F layers over Brazil

Savio¹,

Meneses²,

Muralikrishna³

et al. 2017

Ann. Geophys.

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“…In the present study, we employ the two dimensional (longitude-altitude) version of three-dimensional (longitudealtitude-latitude) simulation model of CII/EPB developed by Kherani et al, 13 by fixing latitude ¼ 0 corresponding to the geomagnetic equator. The model solves the following hydromagnetic equations in the ionosphere:…”

Section: Simulation Modelmentioning

confidence: 99%

Unstable density distribution associated with equatorial plasma bubble

et al. 2016

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In this work, we present a simulation study of equatorial plasma bubble (EPB) in the evening time ionosphere. The fluid simulation is performed with a high grid resolution, enabling us to probe the steepened updrafting density structures inside EPB. Inside the density depletion that eventually evolves as EPB, both density and updraft are functions of space from which the density as implicit function of updraft velocity or the density distribution function is constructed. In the present study, this distribution function and the corresponding probability distribution function are found to evolve from Maxwellian to non-Maxwellian as the initial small depletion grows to EPB. This non-Maxwellian distribution is of a gentle-bump type, in confirmation with the recently reported distribution within EPB from space-borne measurements that offer favorable condition for small scale kinetic instabilities.

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“…[], Huba and Joyce [, ], Sousasantos et al . [], Kherani and Patra [], and so forth. The amount of information provided by these mathematical approaches increased significantly, although the predictability of the EPBs still continues to be a demand for this field of space physics research.…”

Section: Introductionmentioning

confidence: 99%

An alternative possibility to equatorial plasma bubble forecasting through mathematical modeling and Digisonde data

2017

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Equatorial plasma bubbles (EPBs), or large‐scale plasma depleted regions, are one of the subjects of great interest in space weather research since such phenomena have been extensively reported to cause strong degrading effects on transionospheric radio propagation at low latitudes, especially over the Brazilian region, where satellite communication interruptions by the EPBs have been, frequently, registered. One of the most difficult tasks for this field of scientific research is the forecasting of such plasma‐depleted structures. This forecasting capability would be of significant help for users of positioning/navigation systems operating in the low‐latitude/equatorial region all over the world. Recently, some efforts have been made trying to assess and improve the capability of predicting the EPB events. The purpose of this paper is to present an alternative approach to EPB prediction by means of the use of mathematical numerical simulation associated with ionospheric vertical drift, obtained through Digisonde data, focusing on telling beforehand whether ionospheric plasma instability processes will evolve or not into EPB structures. Modulations in the ionospheric vertical motion induced by gravity waves prior to the prereversal enhancement occurrence were used as input in the numerical model. A comparison between the numerical results and the observed EPB phenomena through CCD all‐sky image data reveals a considerable coherence and supports the hypothesis of a capability of short‐term forecasting.

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Fringe field dynamics over equatorial and low‐latitude ionosphere: A three‐dimensional perspective

Cited by 8 publications

References 12 publications

Rocket in situ observation of equatorial plasma irregularities in the region between E and F layers over Brazil

Rocket in situ observation of equatorial plasma irregularities in the region between E and F layers over Brazil

Unstable density distribution associated with equatorial plasma bubble

An alternative possibility to equatorial plasma bubble forecasting through mathematical modeling and Digisonde data

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