Browsing by Author "Kakad, Amar"

Audit of geomagnetic field in polar and south atlantic anomaly regions over two centuries

Kakad, Amar; Kakad, Bharati (2022)

There are several reports about the decrease of the magnetic field of our planet. Here, we present a detailed investigation of the geomagnetic field over past 200 years using magnetic field models (IGRF+gufm1) and ground ...

Bernstein-Greene-Kruskal theory of electron holes in superthermal space plasma

Aravindakshan, Harikrishnan; Kakad, Amar; Kakad, Bharati (2018)

Several spacecraft missions have observed electron holes (EHs) in Earth’s and other planetary magnetospheres. These EHs are modeled with the stationary solutions of Vlasov-Poisson equations, obtained by adopting the ...

Bernstein–Greene–Kruskal ion modes in dusty space plasmas application in Saturn’s magnetosphere

Aravindakshan, Harikrishnan; Kakad, Amar; Kakad, Bharati; Kourakis, Ioannis (2022)

Frequent observations of ion beams moving out from Saturn’s plasma environment hints at the generation of ion Bernstein–Greene–Kruskal (BGK) modes. As the plasma environments of Saturn and its moon Enceladus are characterized ...

Characteristics of Bernstein Greene Kruskal modes in Superthermal Space Plasmas

Aravindakshan, Harikrishnan; Kakad, Amar; Kakad, Bharati (2019)

Bernstein, Greene, and Kruskal (BGK) have developed the theory for one-dimensional stationary nonlinear electrostatic waves in a collisionless plasma [2]. It is a nonlinear kinetic theory formulated in the one-dimensional ...

Characteristics of ElectroMagnetic Ion Cyclotron (EMIC) waves observed at Indian Antarctic station Maitri

Upadhyay, Aditi; Kakad, Bharati; Kakad, Amar; Omura, Yoshiharu; Sinha, Ashwini K. (2019)

The Electromagnetic Ion Cyclotron (EMIC) waves are the discreet electromagnetic emissions observed in the Earth's magnetosphere. The EMIC waves play an important role in the loss processes of highly energetic electrons ...

Characteristics of probability distribution functions of low- and high-latitude current systems during Solar Cycle 24

Kakad, Bharati; Kakad, Amar (2019)

Recent solar cycles (SCs) 21–24 have experienced a gradual decrease in their activity with considerable weakening during current SC 24. This is a unique opportunity to examine the long-term response of Earth’s low-latitude ...

Characteristics of Subpacket Structures in Ground EMIC Wave Observations

Kakad, Bharati; Omura, Yoshiharu; Kakad, Amar; Upadhyay, Aditi; Sinha, Ashwini K. (2018)

Recent studies using satellite observations have reported that subpacket structures play an important role in determining the characteristics of electromagnetic ion cyclotron (EMIC) rising/falling tone emissions. The ...

Characterization of high-frequency waves in the Martian magnetosphere

Kakad, Amar; Kakad, Bharati; Yoon, Peter H.; Omura, Yoshiharu; Kourakis, Ioannis (2023-09)

Context : Various high-frequency waves in the vicinity of upper-hybrid and Langmuir frequencies are commonly observed in different space plasma environments. Such waves and fluctuations have been reported in the magnetosphere ...

Debye-scale solitary structures in the Martian magnetosheath

Kakad, Bharati; Kakad, Amar; Aravindakshan, Harikrishnan; Kourakis, Ioannis (2022)

We present an analysis of 450 solitary wave pulses observed by the Langmuir Probe and Waves instrument on the Mars Atmosphere and Volatile EvolutioN spacecraft during its five passes around Mars on 2015 February 9. The ...

Deepening of radiation belt particles in South Atlantic Anomaly Region: a scenario over past 120 years

Soni, Pankaj K.; Kakad, Bharati; Kakad, Amar (2022)

The geomagnetic field has an unusual weak spot over South America and the South Atlantic Ocean, called South Atlantic Anomaly (SAA). We know that the magnetospheric particles trapped in the geomagnetic field move to the ...

Development of intermediate-scale structure at different altitudes within an equatorial plasma bubble: Implications for L-band scintillations

Bhattacharyya, A.; Kakad, Amar; Gurram, P.; Sripathi, S.; Sunda, S. (2017)

An important aspect of the development of intermediate-scale length (approximately hundred meters to few kilometers) irregularities in an equatorial plasma bubble (EPB) that has not been considered in the schemes to ...

Diminishing activity of recent solar cycles (22–24) and their impact on geospace

Kakad, Bharati; Kakad, Amar; Ramesh, Durbha Sai; Lakhina, Gurbax S. (2019)

This study examines the variation of different energies linked with the Sun and the Earth’s magnetosphere-ionosphere systems for solar cycles (SCs) 22–24 for which the gradual decrease in the solar activity is noticed. ...

Disturbance dynamo effects over low-latitude F region: A study by network of VHF spaced receivers

Kakad, Amar; Surve, G.; Tiwari, P.; Yadav, Virendra; Bhattacharyya, A. (2017)

Generation of equatorial spread F (ESF) irregularities resulting from magnetic disturbance is known for past few decades. However, better prediction models for this phenomenon are still lacking. Magnetic storms also ...

Effect of solar wind pressure and substorm linked particle injection on local time distribution of electromagnetic ion cyclotron waves

Upadhyay, Aditi; Kakad, Bharati; Kakad, Amar; Rawat, R. (2022)

Several observations of electromagnetic ion cyclotron (EMIC) waves have been reported from the Earth’s magnetosphere. It is an important component of space weather research due to its efficient role in precipitating highly ...

Effects of wave potential on electron holes in thermal and superthermal space plasmas

Aravindakshan, Harikrishnan; Kakad, Amar; Kakad, Bharati (2018)

Observations from various interplanetary and other spacecraft missions evince that superthermal distributions are omnipresent in the solar wind and near Earth’s plasma environment. These observations confirm the presence ...

Electron acoustic solitary waves in the Earth’s magnetotail region

Kakad, Amar; Singh, S.V.; Reddy, R.V.; Lakhina, G.S.; Tagare, S.G. (2009)

Satellite observations have revealed solitary potential structures in the Earth’s magnetotail region. These structures have both positive (compressive) and negative (rarefactive) electrostatic potentials. In this paper we ...

Evolution of ion acoustic solitary waves in pulsar wind

Singh, Kuldeep; Kakad, Amar; Kakad, Bharati; Saini, Nareshpal Singh (2020)

We have studied the evolution of ion acoustic solitary waves (IASWs) in pulsar wind. The pulsar wind is modelled by considering a weakly relativistic unmagnetized collisionless plasma comprised of relativistic ions and ...

Evolution of ion acoustic solitary waves in pulsar wind

Singh, Kuldeep; Kakad, Amar; Kakad, Bharati; Saini, Nareshpal Singh (2021)

We have studied the evolution of ion acoustic solitary waves (IASWs) in pulsar wind. The pulsar wind is modelled by considering a weakly relativistic unmagnetized collisionless plasma comprised of relativistic ions and ...

Experimental evidence of ion acoustic soliton chain formation and validation of nonlinear fluid theory

Kakad, Amar; Omura, Yoshiharu; Kakad, Bharati (2013)

We perform one-dimensional fluid simulation of ion acoustic (IA) solitons propagating parallel to the magnetic field in electron-ion plasmas by assuming a large system length. To model the initial density perturbations ...

First-ever model simulation of the new subclass of solitons “Supersolitons” in plasma

Kakad, Amar; Lotekar, Ajay; Kakad, Bharati (2016)

“Supersolitons,” the structures associated with the stationary solitary solutions with the Mach number greater than those associated with the double layers, were introduced in 2012. Later, many researchers have reported ...

Browsing by Author "Kakad, Amar"

Browsing by Author "Kakad, Amar"

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