Upper_Atmosphere: Recent submissions

Now showing items 361-380 of 941

On the latitudinal changes in ionospheric electrodynamics and composition based on observations over the 76–77∘Emeridian fromboth hemispheres during a geomagnetic storm

Shreedevi, P.R.; Thampi, Smitha V.; Chakrabarty, D.; Choudhary, R.K.; Pant, Tarun Kumar; Bhardwaj, Anil; Mukherjee, S. (2016)

The relative contributions of the composition disturbances and the disturbance electric fields in the redistribution of ionospheric plasma is investigated in detail by taking the case of a long-duration positive ionospheric ...
Ion-acoustic Gardner Solitons in electron-positron-ion plasma with two-electron temperature distributions

Rehman, Momin A.; Mishra, M.K. (2016)

(Received 4 September 2015; accepted 30 December 2015; published online 20 January 2016) The ion–acoustic solitons in collisionless plasma consisting of warm adiabatic ions, isothermal positrons, and two temperature ...
Modulation of total electron content by global Pc5 waves at low latitudes

Vorontsova, E.; Pilipenko, V.; Fedorov, E.; Sinha, Ashwini K.; Vichare, Geeta (2016)

Earlier studies have successfully demonstrated that the GPS–TEC technique is a powerful method to study the propagation pattern of transient disturbances in the ionosphere. This technique has turned out to be sensitive ...
Duskside enhancement of equatorial zonal electric field response to convection electric fields during the St. Patrick’s Day storm on 17 March 2015

Tulasiram, S.; Yokoyama, T.; Otsuka, Y.; Shiokawa, K.; Sripathi, S.; Veenadhari, B.; Heelis, R.; Ajith, K.K.; Gowtam, V. Sai; Gurubaran, S.; Supnithi, P.; Huy, M. Le (2016)

The equatorial zonal electric field responses to prompt penetration of eastward convection electric fields (PPEF) were compared at closely spaced longitudinal intervals at dusk to premidnight sectors during the intense ...
Obliquely propagating ion-acoustic solitons and supersolitons in four-component auroral plasmas

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

Arbitrary amplitude nonlinear low frequency electrostatic soliton and supersoliton structures are studied in magnetized fourcomponent auroral plasmas composed of a cold singly charged oxygen-ion fluid, Boltzmann distribution ...
Low-latitude ionosphere response to super geomagnetic storm of 17/18 March 2015: Results from a chain of ground-based observations over Indian sector

Ramsingh; Sripathi, S.; Sreekumar, Sreeba; Banola, S.; Emperumal, K.; Tiwari, P.; Kumar, Burudu Suneel (2015)

In this paper, we present unique results of equatorial and low-latitude ionosphere response to one of the major geomagnetic storms of the current solar cycle that occurred during 17–18 March 2015, where Dst reached its ...
The response of the equatorial ionosphere to fast stream solar coronal holes during 2008 deep solar minimum over Indian region

Sripathi, S.; Singh, Ram; Banola, S.; Singh, Dupinder; Sathishkumar, S. (2016)

In this paper, we report ionospheric response to fast stream solar coronal holes during 2008 deep solar minimum year using ground-based multi-instruments over Indian region. To examine this, we analyzed foF2 (MHz) and ...
Response of OH airglow emissions to mesospheric gravity waves and comparisons with full-wave model simulation at a low-latitude Indian station

Ghodpage, R.N.; Hickey, Michael P.; Taori, Alok K.; Siingh, Devendraa; Patil, P.T. (2016)

Quasi-monochromatic gravity-wave-induced oscillations, monitored using the mesospheric OH airglow emission over Kolhapur (16.8◦ N, 74.2◦ E), India, during January to April 2010 and January to December 2011, have been ...
Impact of the 15 January 2010 annular solar eclipse on the equatorial and low latitude ionosphere over the Indian region

Panda, S.K.; Gedam, S.S.; Rajaram, G.; Sripathi, S.; Bhaskar, Ankush (2015)

The annular solar eclipse of 15 January 2010 over southern India was studied with a multi-instrument network consisting of magnetometer, ionosonde and GPS receivers. The presence of a counter electrojet (weakened or ...
Electron–ion–neutral temperatures and their ratio comparisons over low latitude ionosphere

Bardhan, Ananna; Sharma, D.K.; Khurana, M.S.; Aggarwal, Malini; Kumar, S. (2015)

Annual variations in temperatures of plasma (electron–Te, ion–Ti) using SROSS-C2 satellite and neutral (Tn) using NRLMSIS-00 (neutral atmospheric model); have been investigated and their ratios have been compared over ...
Geographical analysis of equatorial plasma bubbles by GPS and nightglow measurements

Nade, D.P.; Shetti, D.J.; Sharma, A.K.; Taori, A.; Chavan, G.A.; Patil, P.T.; Ghodpage, R.N.; Gurav, O.B.; Nikte, S.S. (2015)

This work about the zonal drift velocity and signature of equatorial plasma bubbles (EPBs) by measurements of global positioning system (GPS) receiver and all sky imager (ASI) operating in India, at the low latitude region. ...
Effect of excess superthermal hot electrons on finite amplitude ion-acoustic solitons and supersolitons in a magnetized auroral plasma

Rufai, O.R.; Bharuthram, R.; Singh, S.V.; Lakhina, G.S. (2015)

The effect of excess superthermal electrons is investigated on finite amplitude nonlinear ionacoustic waves in a magnetized auroral plasma. The plasma model consists of a cold ion fluid, Boltzmann distribution of cool ...
Study of equatorial E region irregularities using rare daytime VHF scintillation observations

Yadav, Virendra; Kakad, Bharati; Pant, T.K.; Bhattacharyya, A.; Prasad, D.S.V.V.D. (2015)

Scintillations on VHF radio signal are sparsely observed during daytime due to unavailability of strong electron density irregularities in equatorial E or F region. Type I/II irregularities observed at E region altitudes ...
Electromagnetic ion cyclotron waves in the Earth’s magnetosphere with a kappa-Maxwellian particle distribution

Sugiyama, Hajime; Singh, S.V.; Omura, Yoshiharu; Shoj, Masafumi; Nunn, David; Summers, Danny (2015)

A theoretical model to study electromagnetic ion cyclotron (EMIC) waves in kappa-Maxwellian plasma is developed. The plasma is assumed to have five components, i.e., electrons, cool and hot protons, and singly charged ...
Altitude development of postmidnight F region field-aligned irregularities observed using Equatorial Atmosphere Radar in Indonesia

Dao, Tam; Otsuka, Yuichi; Shiokawa, Kazuo; Tulasiram, S.; Yamamoto, Mamoru (2015)

For the first time, vertical rise velocities of postmidnight field-aligned irregularities (FAIs) at low geomagnetic latitudes have been examined near the June solstice by using two-dimensional maps of F region FAI echoes ...
Probing the possible trigger mechanisms of an equatorial plasma bubble event based on multistation optical data

Taori, A.; Parihar, Navin; Ghodpage, R.N.; Dashora, N.; Sripathi, S.; Kherani, E.A.; Patil, P.T. (2015)

We analyze an equatorial plasma bubble (EPB) event observed in optical 630 nm image data simultaneously from Gadanki (13.5°N, 79.2°E), Kolhapur (16.8°N, 74.2°E), India. The total electron content data from Gadanki together ...
Principal components of quiet time temporal variability of equatorial and low-latitude geomagnetic fields

Bhattacharyya, A.; Okpala, Kingsley C. (2015)

Diurnal variations of the horizontal component of the geomagnetic field ΔH on International Quiet days of 1999–2012, measured hourly at two stations in the same longitude zone in the Northern Hemisphere, near and away ...
Refinement of the background ionospheric conditions and plausible explanation based on neutral dynamics for the occurrence/non-occurrence of L-band scintillation patches against forecast

Sridharan, R.; Jose, Lijo; Bagiya, Mala S.; Sunda, Surendra; Chaudhary, R.K. (2015)

The recently evolved L-band scintillation forecast mechanism based on the characteristic features of the daytime F-region electron density fluctuations and also on the basic ionospheric conditions had been successful to ...
A self-contained GIM-aided Abel retrieval method to improve GNSS-Radio Occultation retrieved electron density profiles

Tulasiram, S.; Su, Shin-Y; Tsai, Lung-Chi; Liu, Chao Han (2015)

A self-contained global ionospheric maps (GIM)-aided Abel retrieval method is adopted that can account for spherical non-uniformity along the radio wave path in the vicinity of the radio occultation (RO) region using ...
Ionospheric electron density profiling and modeling of COSMIC follow-on simulations

Tsai, L.-C.; Su, S.-Y.; Liu, C.H.; Tulasiram, S. (2015)

The FormoSat-3/ Constellation Observing System for Meteorology, Ionosphere and Climate (FS3/ COSMIC) has been proven a successful mission on pro- filing ionospheric electron density (Ne) using the radio occultation ...

Now showing items 361-380 of 941

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