Upper_Atmosphere: Recent submissions

Now showing items 301-320 of 941

SBAS-derived TEC maps: a new tool to forecast the spatial maps of maximum probable scintillation index over India

Sunda, Surendra; Yadav, Sneha; Sridharan, R.; Bagiya, Mala S. (2017)

With the increase in the use of satellite-based navigation services, the forecasting of L band scintillation has turned out to be of paramount importance as it affects their accuracy and availability. Forecasting the ...
Two sources of dayside intense, quasi-coherent plasmaspheric hiss: A new mechanism for the slot region?

Falkowski, Barbara J.; Tsurutani, Bruce T.; Lakhina, G.S.; Pickett, Jolene S. (2017)

A study of dayside plasmaspheric hiss at frequencies from ~22 Hz to ~1.0 kHz was carried out by using 1 year of Polar data. It is shown that intense, dayside plasmaspheric hiss is correlated with solar wind pressure with ...
A scheme for forecasting severe space weather

Balan, N.; Ebihara, Y.; Skoug, R.; Shiokawa, K.; Batista, I.S.; Tulasiram, S.; Omura, Y.; Nakamura, T.; Fok, M.-C. (2017)

A scheme is suggested and tested for forecasting severe space weather (SvSW) using solar wind velocity (V) and the north-south component (Bz) of the interplanetary magnetic field (IMF) measured using the ACE (Advanced ...
Automatic selection of Dst storms and their seasonal variations in two versions of Dst in 50 years

Balan, N.; Tulasiram, S.; Kamide, Y.; Batista, I.S.; Souza, J.R.; Shiokawa, K.; Rajesh, P.K.; Victor, N. Jeni (2017)

A computer program is developed to automatically identify the geomagnetic storms in Dst index by applying four selection criteria that minimize non-storm-like fluctuations. The program is used to identify the storms in ...
Electrodynamic disturbances in the Brazilian equatorial and low-latitude ionosphere on St. Patrick’s Day storm of 17 March 2015

Venkatesh, K.; Tulasiram, S.; Fagundes, P.R.; Seemala, Gopi K.; Batista, I.S. (2017)

The St. Patrick’s Day storm of 17 March 2015 has a long-lasting main phase with the Dst reaching a minimum of 223 nT. During the main phase, two strong prompt penetration electric field (PPEF) phases took place; first ...
Variability of diurnal tide in the MLT region over Tirunelveli (8.7°N), India: Consistency between groundand space-based observations

Singh, Dupinder; Gurubaran, S. (2017)

Atmospheric tides propagating upward into the mesosphere-lower thermosphere region carry the variability from the lower atmosphere and influence the energy and momentum budgets of this region and above. A comprehensive ...
A comparison of ground-based hydroxyl airglow temperatures with SABER/TIMED measurements over 23 N, India

Parihar, Navin; Singh, Dupinder; Gurubaran, S. (2017)

Ground-based observations of OH(6, 2) Meinel band nightglow were carried out at Ranchi (23.3 N, 85.3 E), India, during January–March 2011, December 2011–May 2012 and December 2012–March 2013 using an all-sky imaging ...
Role of IMF By in the prompt electric field disturbances over equatorial ionosphere during a space weather event

Chakrabarty, D.; Hui, Debrup; Rout, Diptiranjan; Sekar, R.; Bhattacharyya, A.; Reeves, G.D.; Ruohoniemi, J.M. (2017)

On 7 January 2005 (Ap = 40) prompt penetration electric field perturbations of opposite polarities were observed over Thumba and Jicamarca on a few occasions during 13:45–16:30 UT. However, the electric field was found ...
A high-altitude balloon experiment to probe stratospheric electric fields from low latitudes

Gurubaran, S.; Shanmugam, Manu; Jawahar, K.; Emperumal, K.; Mahavarkar, Prasanna; Buduru, Suneel Kumar (2017)

The Earth’s electrical environment hosts a giant electrical circuit, often referred to as the global electric circuit (GEC), linking the various sources of electrical generators located in the lower atmosphere, the ...
On the governing dynamics of the VHF radar echoes from the mesosphere and collision-dominated lower E region over Gadanki (13.5°N, 79.2°E)

Selvaraj, D.; Patra, A.K.; Sathishkumar, S.; Kumar, K. Kishore; Rao, D. Narayana (2016)

In the present communication, the role of neutral dynamical processes in governing the morphology and seasonal variations of daytime VHF radar echoes from the mesosphere and the collision-dominated lower E region is ...
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 ...
Seasonal, inter-annual and solar cycle variability of the quasi two day wave in the low-latitude mesosphere and lower thermosphere

Rao, N. Venkateswara; Ratnam, M. Venkat; Vedavathi, C.; Tsuda, T.; Murthy, B.V. Krishna; Sathishkumar, S.; Gurubaran, S.; Kumar, K. Kishore; Subrahmanyam, K.V.; Rao, S. Vijaya Bhaskara (2017)

We analyzed 17 years (1993–2009) of horizontal winds measured by the medium frequency (MF) radar located at Tirunelveli (8.7°N, 77.8°E) and 10 years (2005–2014) of horizontal winds measured by a meteor radar located at ...
Dependence of near field co-seismic ionospheric perturbations on surface deformations: A case study based on the April, 25 2015 Gorkha Nepal earthquake

Sunil, A.S.; Bagiya, Mala S.; Catherine, Joshi; Rolland, Lucie; Sharma, Nitin; Sunil, P.S.; Ramesh, D.S. (2016)

Ionospheric response to the recent 25 April 2015 Gorkha, Nepal earthquake is studied in terms of Global Positioning System-Total Electron Content (GPS-TEC) from the viewpoints of source directivity, rupture propagation ...
Dependence of Coherence Scales of Ionospheric Scintillation Patterns on Magnetic Activity

Chavan, G.A.; Sharma, A.K.; Gurav, O.B.; Gaikwad, H.P.; Nade, D.P.; Nikte, S.S.; Ghodpage, R.N.; Patil, P.T. (2016)

The amplitude scintillation data, recorded at 251 MHz by two spaced receivers at low latitude station Kolhapur [16.42oN, 74.2oE] are used. We have considered data of magnetically disturbed days (Ap[20) to investigate the ...
Conjugate hemisphere ionospheric response to the St. Patrick’s Day storms of 2013 and 2015 in the 100°E longitude sector

Kalita, Bitap Raj; Hazarika, Rumajyoti; Kakoti, Geetashree; Bhuyan, P.K.; Chakrabarty, D.; Seemala, Gopi K.; Wang, K.; Sharma, S.; Yokoyama, T.; Supnithi, P.; Komolmis, T.; Yatini, C.Y.; Huy, M. Le; Roy, P. (2016)

The effects of the St. Patrick’s Day geomagnetic storms of 2013 and 2015 in the equatorial and low-latitude regions of both hemispheres in the 100°E longitude sector is investigated and compared with the response in the ...
Multifractal detrended fluctuation analysis of ionospheric total electron content data during solar minimum and maximum

Chandrasekhar, E.; Prabhudesai, Sanjana S.; Seemala, Gopi K.; Shenvi, Nayana (2016)

The spatio-temporal variations in ionospheric vertical total electron content (TEC) data, which often reflect their scale invariant properties, can well be studied with multifractal analysis. We discuss the multifractal ...
Ponderomotive processes as proxies for breaking of ion acoustic solitary waves

Kakad, Amar; Kakad, Bharati (2016)

Wave breaking is a ubiquitous nonlinear phenomenon in plasma that is followed by sudden drop of wave amplitude after a wave steepening. We perform fluid simulation of the ion acoustic solitary waves (IASWs) to investigate ...
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 ...
A regional geomagnetic model using fourier analysis

Jayapal, R.; Gopal, Shenu; Anilkumar, C.P.; Venugopal, Chandu (2016)

We have Fourier analysed the horizontal component (H) of the Earth’s magnetic field at Thiruvananthapuram (lat. 8o 29’ N, long. 76o 59’ E) during the years 1987 to 1998. The infinite number of terms in the Fourier expansion ...
The 25 April 2015 Nepal Earthquake: Investigation of precursor in VLF subionospheric signal

Maurya, A.K.; Venkatesham, K.; Tiwari, P.; Vijaykumar, K.; Singh, Rajesh; Singh, Ajay K.; Ramesh, D.S. (2016)

We present a critical analysis of the observations and interpretation of VLF subionospheric measurements related to the main Nepal Gorkha earthquake which occurred on 25 April 2015 (Mw7.8) and its major aftershock on 12 ...

Now showing items 301-320 of 941

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