ODA_Reprints: Recent submissions

Now showing items 41-60 of 185

Three different types of electric field disturbances affecting equatorial ionosphere during a long-duration prompt penetration event

Chakrabarty, D.; Rout, Diptiranjan; Sekar, R.; Narayanan, R.; Reeves, G.D.; Pant, Tarun K.; Veenadhari, B.; Shiokawa, K. (2015)

Coordinated digisonde and OI 630.0 nm airglow observations from Thumba (TVM), an Indian dip equatorial station, in conjunction with magnetic and geosynchronous particle flux measurements, reveal three different types of ...
Latitudinal variation in the occurrence of GPS L-band scintillations associated with the day-to-day changes in TEC, h′F and the E×B drift velocity and their impact on GPS satellite signals

Venkatesh, K.; Rao, P.V.S. Rama; Seemala, Gopi K.; Prasad, D.S.V.V.D. (2015)

The present study describes the day-to-day variations in the occurrence of GPS L-band scintillations from equator to the anomaly crest location associated with the changes in TEC, h′F and E ×B drift velocities. The GPS–TEC ...
Brief Communication: Climate, topographical and meteorological investigation of the 16-17 June 2013 Kedarnath (India) disaster causes

Singh, Rajesh; Siingh, Devendraa; Gokani, Sneha A.; Buchunde, P.S.; Singh, R.P.; Singh, A.K. (2015)

The devastating episode (17–18 June 2013) at Kedarnath (Uttrakhand, India) caused huge loss of lives and physical/material wealth. To understand this catastrophic event, rainfall/convective data and associated climate ...
Climatology of GPS amplitude scintillations over equatorial Africa during the minimum and ascending phases of solar cycle 24

Akala, A.O.; Amaeshi, L.L.N.; Somoye, E.O.; Idolor, R.O.; Okoro, E.; Doherty, P.H.; Groves, K.M.; Carrano, C.S.; Bridgwood, C.T.; Baki, P.; D’ujanga, F.M.; Seemala, Gopi K. (2015)

This study characterizes African equatorial scintillations at L-band frequency during the minimum and ascending phases of solar cycle 24. Three years’ (2009–2011) of amplitude scintillation data from three African equatorial ...
Gravity waves in the thermosphere: Solar activity dependence

Laskar, Fazlul I.; Pallamraju, Duggirala; Veenadhari, B.; Lakshmi, T. Vijaya; Reddy, M. Anji; Chakrabarti, Supriya (2015)

A statistical study of the thermospheric gravity waves has been carried out using multiwavelength daytime oxygen airglow emission intensity and equatorial electrojet (EEJ) strength data, which originate from four different ...
Lightning and convective rain over Indian peninsula and Indo-China peninsula

Siingh, Devendraa; Buchunde, P.S.; Gandhi, H.; Singh, Rajesh; Singh, Shubha; Patil, M.N.; Singh, R.P. (2015)

The impact of surface temperature, CAPE, convective cloud cover, outgoing long wave radiation and aerosol concentrations on lightning flashes and convective rainfall in the Indian peninsular and Indo-China peninsular regions ...
Subionospheric VLF perturbations observed at a low latitude station Varanasi (L = 1.07)

Singh, Ashutosh K.; Singh, A.K.; Singh, Rajesh; Singh, R.P.; Adams, K.; Dowden, R.L. (2015)

Initial results of subionospheric very low frequency (VLF) perturbations observed on NWC (19.8 kHz) and NPM (21.4 kHz) transmitter signals at low latitude ground station Varanasi, India, during the period January–June 2010, ...
Response of the low-latitude D region ionosphere to extreme space weather event of 14–16 December 2006

Kumar, Sushil; Kumar, Abhikesh; Menk, Frederick; Maurya, A.K.; Singh, Rajesh; Veenadhari, B. (2015)

The response of the D region low-latitude ionosphere has been examined for extreme space weather event of 14–16 December 2006 associated with a X1.5 solar flare and an intense geomagnetic storm (Dst = −146 nT) using VLF ...
Solar flares induced D-region ionospheric and geomagnetic perturbations

Selvakumaran, R.; Maurya, A.K.; Gokani, Sneha A.; Veenadhari, B.; Kumar, Sushil; Venkatesham, K.; Phanikumar, D.V.; Singh, Abhay K.; Siingh, Devendraa; Singh, Rajesh (2015)

The D-region ionospheric perturbations caused by solar flares which occurred during January 2010–February 2011, a low solar activity period of current solar cycle 24, have been examined on NWC transmitter signal (19.8 kHz) ...
Relationship between the equatorial electrojet and global Sq currents at the dip equator region

Hamid, Nurul Shazana Abdul; Liu, Huixin; Uozumi, Teiji; Yumoto, Kiyohumi; Veenadhari, B.; Yoshikawa, Akimasa; Sanchez, Jairo Avendaño (2014)

The equatorial electrojet (EEJ) is a strong eastward ionospheric current flowing in a narrow band along the dip equator. In this study, we examined the EEJ-Sq relationship by using observations at six stations in the South ...
Solar flare induced D-region ionospheric perturbations evaluated from VLF measurements

Singh, Ashutosh K.; Singh, A.K.; Singh, Rajesh; Singh, R.P. (2014)

The results of very low frequency (VLF) wave amplitude measurements carried out at the low latitude station Varanasi (geom. lat. 14∘55′N, long. 154∘E), India during solar flares are presented for the first time. The VLF ...
Response of the mid-latitude D-region ionosphere to the total solar eclipse of 22 July 2009 studied using VLF signals in South Korean peninsula

Phanikumar, D.V.; Kwak, Y.-S.; Patra, A.K.; Maurya, A.K.; Singh, Rajesh; Park, S.-M. (2014)

In this paper, we analyze VLF signals received at Busan to study the the D-region changes linked with the solar eclipse event of 22 July 2009 for very short (∼390 km) transmitter–receiver great circle path (TRGCP) during ...
Whistlers detected and analyzed by Automatic Whistler Detector (AWD) at low latitude Indian stations

Singh, Abhay K.; Singh, S.B.; Singh, Rajesh; Gokani, Sneha A.; Singh, Ashok K.; Siingh, Devendraa; Lichtenberger, János (2014)

Recently, at three Indian low latitude stations: Varanasi (geomag. lat. 14°55′N, geomag. long. 153°54′E, L: 1.078), Allahabad (geomag. lat. 16.05°N; geomag. long. 155.34°E, L: 1.081) and Lucknow (geomag. lat. 17.6°N, geomag. ...
Low-mid latitude D region ionospheric perturbations associated with 22 July 2009 total solar eclipse: Wave-like signatures inferred from VLF observations

Maurya, A.K.; Phanikumar, D.V.; Singh, Rajesh; Kumar, Sushil; Veenadhari, B.; Kwak, Y.-S.; Kumar, Abhikesh; Singh, Abhay K.; Kumar, K. Niranjan (2014)

We present first report on the periodic wave-like signatures (WLS) in the D region ionosphere during 22 July 2009 total solar eclipse using JJI, Japan, very low frequency (VLF) navigational transmitter signal (22.2 kHz) ...
First observations of transient luminous events in Indian sub-continent

Singh, Rajesh; Maurya, A.K.; Veenadhari, B.; Gokani, Sneha A.; Selvakumaran, R.; Cohen, Morris B.; Chanrion, Olivier; Neubert, Torsten (2014)
Ionospheric current contribution to the main impulse of a negative sudden impulse

Vichare, Geeta; Rawat, Rahul; Bhaskar, Ankush; Pathan, B.M. (2014)

The geomagnetic field response to a moderate-amplitude negative sudden impulse (SI−) that occurred on 14 May 2009 at 10:30 UT was examined at 97 geomagnetic observatories situated all over the globe. The response signature ...
Low energy secondary cosmic ray flux (gamma rays) monitoring and its constrains

Raghav, Anil; Bhaskar, Ankush; Yadav, Virendra; Bijewar, Nitinkumar (2015)

Temporal variation of secondary cosmic rays (SCR) flux was measured during the full and new moon and days close to them at Department of Physics, University of Mumbai, Mumbai (Geomagnetic latitude: 10.6 °N), India. The ...
Gravity, GPS and geomagnetic data in India

Tiwari, V.M.; Veenadhari, B.; Gahalaut, V.K.; Mukherjee, S.; Dimri, V.P. (2014)

Gravity, Global Positioning System (GPS) and Geomagnetic data sets in India are acquired by different research, academic and government institutions, under various projects. These data sets have extensively been utilized ...
Quantitative understanding of Forbush decrease drivers based on shock-only and CME-only models using global signature of February 14, 1978 event

Raghav, Anil; Bhaskar, Ankush; Lotekar, Ajay; Vichare, Geeta; Yadav, Virendra (2014)

We have studied the Forbush decrease (FD) event that occurred on February 14, 1978 using 43 neutron monitor observatories to understand the global signature of FD. We have studied rigidity dependence of shock amplitude and ...
Vertical coupling of atmospheres: dependence on strength of sudden stratospheric warming and solar activity

Laskar, Fazlul I.; Pallamraju, Duggirala; Veenadhari, B. (2014)

Comprehensive behavior of the low-latitude upper atmosphere during sudden stratospheric warming (SSW) events at varying levels of solar activity has been investigated. The equatorial electrojet (EEJ) strength and the total ...

Now showing items 41-60 of 185

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