Observatories_and_Data_Analysis: Recent submissions

Now showing items 1-20 of 185

VHF scintillations as a diagnostic tool for the study of ionospheric irregularities

Pathan, B.M. (1994)

In this paper we present the results of observations of the scintillations of radio beacon on 250.351 MHz from geostationary satellite FLEETSAT (73° E) recorded at Bombay on April 9–10, 1992 during night hours. The ...
Variability of lightning, convective rain and solar activity study over South/Southeast Asia during ENSO episode for the period of 1998-2010

Siingh, Devendraa; Dharmaraj, T.; Kumar, P. Ramesh; Singh, Rajesh; Kumar, Sanjay; Chinthalu, G.R.; Patil, M.N.; Singh, R.P. (2017)

Analysis of monthly mean data of lightning and convective rain for the region 8° N - 35° N, 60° E - 120° E and for the period 1998-2010 show that lightning and convective rain are not significantly influenced by solar ...
Long-term morphological and power spectral studies of VHF amplitude scintillations recorded over Waltair (17.7°N, 83.3°E), India

Srinivasu, Vadlamuri Kanaka Durga; Brahmanandam, Potula Sree; Uma, Gouthu; Rao, Paluri Venkata Satya Rama; Mukherjee, S.; Prasad, Dasari Shanmukha Veera Venkata Durga (2017)

This research reports on recently recorded 250 MHz amplitude scintillations at Waltair (17.7°N, 83.3°E), a low-latitude station in India, using the signals radiated from a geostationary satellite (FLEETSAT, 73°E) during ...
The afternoon counter-electrojet current system along the 75°E meridian during the IEEY

Bhardwaj, S.K.; Rao, P.B.V. Subba (2017)

In the present study, the technique of principal component analysis (PCA) is applied to analyze the hourly mean values of geomagnetic feld components D, H, and Z along an Indo-Russian chain of stations during the ...
Rare observation of daytime whistlers at very low latitude (L = 1.08)

Gokani, Sneha A.; Singh, Rajesh; Tulasiram, S.; Venkatesham, K.; Veenadhari, B.; Kumar, Sandeep; Selvakumaran, R. (2017)

The source region and propagation mechanism of low latitude whistlers (Geomag. lat. <30 ) have puzzled scientific community for last many decades. In view of recent reports, there is consensus on the source region of low ...
The low cost Proton Precession Magnetometer developed at the Indian Institute of Geomagnetism

Mahavarkar, Prasanna; Singh, S.; Labde, S.; Dongre, Varun; Patil, A. (2017)

Proton magnetometers are the oldest scalar magnetometers. The first commercial units were produced in early 1960s as portable instruments. In continuation airborne instruments appeared with optimized speed of readings ...
Long term drifts in baselines of ground magnetic observatories

Iype, Anil; Deshmukh, A.T.; Veenadhari, B. (2017)

The stability of baseline is the most important criterion for evaluating the data quality of a ground magnetic observatory. Theoretically, a baseline should be a straight line, provided, there are no error factors affecting ...
The role of interplanetary shock orientation on SC/SI rise time and geoeffectiveness

Selvakumaran, R.; Veenadhari, B.; Ebihara, Y.; Kumar, Sandeep; Prasad, D.S.V.V.D. (2017)

Interplanetary (IP) shocks interact with the Earth’s magnetosphere, resulting in compression of the magnetosphere which in turn increases the Earth’s magnetic field termed as Sudden commencement/Sudden impulse (SC/SI). ...
Quantitative assessment of drivers of recent global temperature variability: an information theoretic approach

Bhaskar, Ankush; Ramesh, D.S.; Vichare, Geeta; Koganti, Triven; Gurubaran, S. (2017)

Identification and quantification of possible drivers of recent global temperature variability remains a challenging task. This important issue is addressed adopting a non-parametric information theory technique, ...
Seasonal variation of the Sq focus position during 2006–2010

Vichare, Geeta; Rawat, Rahul; Jadhav, Madhavi; Sinha, Ashwini K. (2017)

In the present paper, the perception of the seasonal variation of the Sq focus position is re-examined during low solar activity period (2006–2010). Equivalent current vectors are plotted for each geomagnetic quiet day ...
Profuse activity of blue electrical discharges at the tops of thunderstorms

Chanrion, Olivier; Neubert, Torsten; Mogensen, Andreas; Yair, Yoav; Stendel, Martin; Singh, Rajesh; Siingh, Devendraa (2017)

Thunderstorm clouds may reach the lower stratosphere, affecting the exchange of greenhouse gases between the troposphere and stratosphere. This region of the atmosphere is difficult to access experimentally, and our ...
Electrodynamic influence on the diurnal behaviour of neutral daytime airglow emissions

Karan, Deepak K.; Pallamraju, Duggirala; Phadke, Kedar A.; Vijayalakshmi, Tatiparti; Pant, Tarun K.; Mukherjee, S. (2016)

The diurnal variations in daytime airglow emission intensity measurements at three wavelengths OI 777.4 nm, OI 630.0 nm, and OI 557.7 nm made from a low-latitude location, Hyderabad (17.5 N, 78.4 E; 8.9 N MLAT) in ...
22 July 2009 total solar eclipse induced gravity waves in ionosphere as inferred from GPS observations over EIA

Kumar, K. Vijay; Maurya, A.K.; Kumar, Sanjay; Singh, Rajesh (2016)

In the present contribution we investigate the variation in the Global Positioning System (GPS) derived ionospheric Total Electron Content (TEC) over Equatorial Ionization Anomaly (EIA) region on the rare occasional ...
Characteristics of equatorial electrojet derived from Swarm satellites

Thomas, Neethal; Vichare, Geeta; Sinha, Ashwini K. (2017)

The vector magnetic field measurements from three satellite constellation, Swarm mission (Alpha ‘Swarm-A’, Bravo ‘Swarm-B’, and Charlie ‘Swarm-C’) during the quiet days (daily P Kp 6 10) of the years 2014–2015 are used ...
Direct observational evidence for disturbance dynamo on the daytime low-latitude ionosphere: A case study based on the 28 June 2013 space weather event

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

A case of the westward disturbance dynamo (DD) electric field, influencing the daytime equatorial and low-latitude ionosphere, during a geomagnetic storm that occurred on 28–29 June 2013 is presented. The GPS total ...
Possible relationship between the equatorial electrojet (EEJ) and daytime vertical E B drift velocities in F region from ROCSAT observations

Kumar, Sandeep; Veenadhari, B.; Tulasiram, S.; Su, S.-Y.; Kikuchi, T. (2016)

The vertical E B drift is very important parameter as its day to day variability has great influence on the variability in the low latitude F-region ion and electron density distributions. The measurements of vertical ...
Longitudinal inequalities in Sq current system along 20 deg - 210 deg E meridian

Bharadwaj, S.K.; Rao, P.B.V. Subba (2016)

In the present study, longitudinal inequalities in Sq current system have been examined utilizing the data of northern and southern hemispheric stations for the period 1976 - 1977 along 200-2100 E meridian. The anomalous ...
On the association of lightning activity and projected change in climate over the Indian sub-continent

Saha, Upal; Siingh, Devendraa; Kamara, A.K.; Galanaki, Elissavet; Animesh, Maitra; Singh, R.P.; Singh, A.K.; Chakraborty, Swastika; Singh, Rajesh (2017)

The association of lightning activity with the long-term as well as seasonal spatio-temporal distribution of convective available potential energy (CAPE), surface convective precipitation, vegetation cover and ...
On the reduced geoeffectiveness of solar cycle 24: A moderate storm perspective

Selvakumaran, R.; Veenadhari, B.; Akiyama, S.; Pandya, Megha; Gopalswamy, N.; Yashiro, S.; Kumar, Sandeep; Makela, P.; Xie, H. (2016)

The moderate and intense geomagnetic storms are identified for the first 77 months of solar cycles 23 and 24. The solar sources responsible for the moderate geomagnetic storms are indentified during the same epoch for ...
Relative contribution of the magnetic field barrier and solar wind speed in ICME-associated forbush decreases

Bhaskar, Ankush; Subramanian, Prasad; Vichare, Geeta (2016)

We study 50 cosmic-ray Forbush decreases (FDs) from the Oulu neutron monitor data during 1997–2005 that were associated with Earth-directed interplanetary coronal mass ejections (ICMEs). Such events are generally thought ...

Now showing items 1-20 of 185

Search DSpace

Advanced Search

Browse

All of DSpace
This Community
- By Issue Date
- Authors
- Titles
- Subjects

Recently added

Observatories_and_Data_Analysis: Recent submissions

Search DSpace

Browse

All of DSpace

This Community

My Account