Upper_Atmosphere: Recent submissions

Now showing items 321-340 of 941

Heliospheric plasma sheet (HPS) impingement onto the magnetosphere as a cause of relativistic electron dropouts (REDs) via coherent EMIC wave scattering with possible consequences for climate change mechanisms

Tsurutani, B.T.; Hajra, R.; Tanimori, T.; Takada, A.; Bhanu, R.; Mannucci, A.J.; Lakhina, G.S.; Kozyra, J.U.; Shiokawa, K.; Lee, L.C.; Echer, E.; Reddy, R.V.; Gonzalez, W.D. (2016)

A new scenario is presented for the cause of magnetospheric relativistic electron decreases (REDs) and potential effects in the atmosphere and on climate. High-density solar wind heliospheric plasmasheet (HPS) events ...
Effects of disturbed electric fields in the low-latitude and equatorial ionosphere during the 2015 St. Patrick's Day storm

Kuai, Jiawei; Liu, Libo; Liu, Jing; Sripathi, S.; Zhao, Biqiang; Chen, Yiding; Le, Huijun; Hu, Lianhuan (2016)

The 2015 St. Patrick's Day geomagnetic storm with SYM-H value of 233 nT is an extreme space weather event in the current 24th solar cycle. In this work, we investigated the main mechanisms of the profound ionospheric ...
Electron acoustic solitary waves in a magnetized plasma with nonthermal electrons and an electron beam

Singh, S.V.; Devanandhan, S.; Lakhina, G.S.; Bharuthram, R. (2016)

A theoretical investigation is carried out to study the obliquely propagating electron acoustic solitary waves having nonthermal hot electrons, cold and beam electrons, and ions in a magnetized plasma. We have employed ...
On the fresh development of equatorial plasma bubbles around the midnight hours of June solstice

Ajith, K.K.; Tulasiram, S.; Yamamoto, M.; Otsuka, Y.; Niranjan, K. (2016)

Using the 47 MHz Equatorial Atmosphere Radar (EAR) at Kototabang, Indonesia, the nocturnal evolution of equatorial plasma bubbles (EPBs) was examined during the moderate solar activity years 2011–2012. While the evolution ...
Coupling of electrostatic ion cyclotron and ion acoustic waves in the solar wind

Sreeraj, T.; Singh, S.V.; Lakhina, G.S. (2016)

The coupling of electrostatic ion cyclotron and ion acoustic waves is examined in three component magnetized plasma consisting of electrons, protons, and alpha particles. In the theoretical model relevant to solar wind ...
Transitional properties of supersolitons in a two electron temperature warm multi-ion plasma

Steffy, S.V.; Ghosh, S.S. (2016)

The existence domain of an ion acoustic supersoliton and its transition to a regular kind of solitary wave have been explored in detail using Sagdeev pseudopotential technique for a two electron temperature warm multi-ion ...
Characteristics of the equatorial plasma drifts as obtained by using Canadian Doppler ionosonde over southern tip of India

Sripathi, S.; Singh, Ram; Banola, S.; Sreekumar, Sreeba; Emperumal, K.; Selvaraj, C. (2016)

We present here characteristics of the Doppler drift measurements over Tirunelveli (8.73°N, 77.70°E; dip 0.5°N), an equatorial site over Southern India using Doppler interferometry technique of Canadian ionosonde. ...
Solar quiet current response in the African sector due to a 2009 sudden stratospheric warming event

Bolaji, O.J.; Oyeyemi, E.O.; Owolabi, O.P.; Yamazaki, Y.; Rabiu, A.B.; Okoh, D.; Fujimoto, A.; Amory-Mazaudier, C.; Seemala, Gopi K.; Yoshikawa, A.; Onanuga, O.K. (2016)

We present solar quiet (Sq) variation of the horizontal (H) magnetic field intensity deduced from Magnetic Data Acquisition System (MAGDAS) records over Africa during an unusual strong and prolonged 2009 sudden stratospheric ...
A differential electrometer for vector electric field measurements on a balloon platform

Jawahar, K.; Manu, S.; Gurubaran, S. (2016)

Vector measurements of middle atmospheric electric fields are mostly carried out using a double-Langmuir probe technique on platforms like balloons and rockets. High impedances (up to 1013 ohms) and low signal levels ...
Direct observational evidence for the merging of equatorial plasma bubbles

Narayanan, V.L.; Gurubaran, S.; Shiokawa, K. (2016)

In this work we present direct ground-based observational evidence for the merging of individual equatorial plasma bubbles (EPBs) obtained through the imaging of OI 630.0nm airglow. Three potential mechanisms have been ...
Structuring of intermediate scale equatorial spread F irregularities during intense geomagnetic storm of solar cycle 24

Kakad, Bharati; Gurram, P.; Sundari, P.N.B. Tripura (2016)

Here we examine the structuring of equatorial plasma bubble (EPB) during intense geomagnetic storm of solar cycle (SC) 24 that occurred on 17 March 2015 using spaced receiver scintillation observations on a 251 MHz radio ...
LSWS linked with the low-latitude Es and its implications for the growth of the R-T instability

Joshi, L.M. (2016)

A comprehensive investigation of spread F irregularities over the Indian sector has been carried out using VHF radar and ionosonde observations. Two different categories of spread F observations, one where the onset of ...
Shrinking equatorial plasma bubbles

Narayanan, V.L.; Gurubaran, S.; Shiokawa, K.; Emperumal, K. (2016)

The formation of equatorial plasma bubbles (EPBs) associated with spread F irregularities are fairly common phenomenon in the postsunset equatorial ionosphere. These bubbles grow as a result of eastward polarization ...
Simultaneous storm time equatorward and poleward large-scale TIDs on a global scale

Habarulema, John Bosco; Katamzi, Zama Thobeka; Yizengaw, Endawoke; Yamazaki, Yosuke; Seemala, Gopi K. (2016)

We report on the first simultaneous observations of poleward and equatorward traveling ionospheric disturbances (TIDs) during the same geomagnetic storm period on a global scale. While poleward propagating TIDs originate ...
Response to “Comment on ‘Existence domains of slow and fast ion-acoustic solitons in two-ion space plasmas’” [Phys. Plasmas 23, 064701 (2016)]

Singh, S.V.; Lakhina, G.S. (2016)
Comparison of the dynamical response of low latitude middle atmosphere to the major stratospheric warming events in the Northern and Southern Hemispheres

Bhagavathiammal, G.J.; Sathishkumar, S.; Sridharan, R.; Gurubaran, S. (2016)

This study presents comparison of low-latitude dynamical responses to boreal 2008/09 and austral 2002 winter Major Stratospheric Warming (MSW) events, as both events are of vortex split type. During these winters, planetary ...
Existence domains of electrostatic solitary structures in the solar wind plasma

Rubia, R.; Singh, S.V.; Lakhina, G.S. (2016)

Electrostatic solitary waves and double layers are explored in a homogeneous, collisionless, and magnetized three-component plasma composed of hot protons, hot heavier ions (alpha particles, Heþþ), and suprathermal ...
Arbitrary amplitude fast electron-acoustic solitons in three-electron component space plasmas

Mbuli, L.N.; Maharaj, S.K.; Bharuthram, R.; Singh, S.V.; Lakhina, G.S. (2016)

We examine the characteristics of fast electron-acoustic solitons in a four-component unmagnetised plasma model consisting of cool, warm, and hot electrons, and cool ions. We retain the inertia and pressure for all the ...
Role of finite ionospheric conductivity on toroidal field line oscillations in the Earth’s magnetosphere—Analytic Solutions

Bulusu, Jayashree; Sinha, Ashwini K.; Vichare, Geeta (2016)

An analytic solution has been formulated to study the role of ionospheric conductivity on toroidal field line oscillations in the Earth’s magnetosphere. The effect of ionospheric conductivity is addressed in two limits, ...
Spatial frequencies associated with the latitudinal structures of ionospheric currents seen by CHAMP satellite

Thomas, Neethal; Vichare, Geeta; Sinha, A.K. (2016)

The CHAMP magnetic field variations during international quiet days of low solar activity period 2008– 2009 are investigated. The present paper reports the existence of frequency peaks ≤20 mHz in the compressional component ...

Now showing items 321-340 of 941

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