UAS_Reprints: Recent submissions

Now showing items 261-280 of 941

Signal Frequency Dependence of Ionospheric Scintillations: An Indicator of Irregularity Spectrum Characteristics

Bhattacharyya, A; Gurram, P; Kakad, Bharati; Sripathi, S (2019)

Multifrequency scintillation observations show that strong amplitude scintillations on very high frequency (VHF) signals are accompanied by weak L‐band scintillations near the dip equator and strong L‐band scintillations ...
Generation of series of electron acoustic solitary wave pulses in plasma

Kakad, Amar; Kakad, Bharati (2019)

One-dimensional fluid simulation is used to investigate the generation of electron-acoustic solitary waves (EASWs) in three-species plasma. We consider an unmagnetized collisionless plasma consisting of cold electrons, ...
A fluid simulation-based evidence of the soliton-type behavior of supersolitary waves in plasma

Lotekar, Ajay; Kakad, Amar; Kakad, Bharati (2019)

We performed a fluid simulation of the head-on collision of supersolitary waves (SSWs) with regular solitary waves (RSWs) in a plasma consisting of cold fluid ions and two-temperature electrons having kappa distributions. ...
Formation of Asymmetric Electron Acoustic Double Layers in the Earth's Inner Magnetosphere

Kakad, Amar; Kakad, Bharati (2019)

The Van Allen Probes have observed both symmetric and asymmetric bipolar electric field structures in the Earth's inner magnetosphere. In general, the symmetric bipolar structures are identified as electron-phase space ...
Occurrence characteristics of equatorial plasma bubbles and total electron content during solar cycle peak 23rd to peak 24th over Bangalore (13.02◦ N, 77.57◦ E)

Seemala, Gopi K (2019)

We present the monthly, seasonal and annual variation in the ionospheric total electron content (TEC) and % occurrence rate of Equatorial plasma bubble (EPBs) during the lowest to highest solar activity phase for the ...
Diurnal and seasonal variations of radon ( 222Rn) and their dependence on soil moisture and vertical stability of the lower atmosphere at Pune, India

Singh, Rajesh (2019)

Continuous measurements of the concentration of Radon (222Rn) and its progenies were made with a Radon detector, RTM 2200, at a tropical site, Pune (18� 310 N, 73� 550 E, 560 m), India from January to December 2012. ...
Assessment of Unusual Gigantic Jets observed during the Monsoon season: First observations from Indian Subcontinent

Singh, Rajesh; Maurya, A.K.; Chanrion, Olivier; Neubert, Torsten; Cummer, Steven A.; Mlynarczyk, Janusz; Cohen, Morris B.; Siingh, Devendraa; Kumar, Sushil (2017)

Gigantic Jets are electric discharges from thunderstorm cloud tops to the bottom of ionosphere at ~90 km altitude and electrically connect the troposphere and lower ionosphere. Since their first report in 2002, sporadic ...
Prediction of the Length of Upcoming Solar Cycles

Kakad, Bharati; Kakad, Amar; Ramesh, D.S. (2017)

The forecast of solar cycle (SC) characteristics is crucial particularly for several space-based missions. In the present study, we propose a new model for predicting the length of the SC. The model uses the information ...
Satellite drag effects due to uplifted oxygen neutrals during super magnetic storms

Lakhina, G.S.; Tsurutani, Bruce T. (2017)

During intense magnetic storms, prompt penetration electric fields (PPEFs) through E × B forces near the magnetic equator uplift the dayside ionosphere. This effect has been called the “dayside super-fountain effect”. ...
An Artificial Neural Network-Based Ionospheric Model to Predict NmF2 and hmF2 Using Long-Term Data Set of FORMOSAT-3/COSMIC Radio Occultation Observations: Preliminary Results

Gowtam, V. Sai; Tulasiram, S. (2017)

Artificial Neural Networks (ANNs) are known to be capable of solving linear as well as highly nonlinear problems. Using the long-term and high-quality data set of Formosa Satellite-3/Constellation Observing System for ...
Study of ionospheric irregularities from Kolhapur (16.4 deg N, 74.2 deg E)

Sharma, A.K. (2017)

The paper reports night time observations of ionospheric irregularities made through amplitude scintillation of 251 MHz signal at Kolhapur (16.4 N, 74.2 E), an equatorial Appleton anomaly region using spaced antenna system. ...
Some new insights of the characteristics of equatorial plasma bubbles obtained from Indian region

Narayanan, V.L.; Gurubaran, S.; Shiny, M.B. Berlin; Emperumal, K.; Patil, P.T. (2017)

All-sky imaging observations of OI 630.0 nm airglow were carried out in campaign mode from Panhala (16.8°N, 74.1°E geographic; 11.1°N dip latitude), India, during January to March 2008. On 14 of 37 nights, equatorial plasma ...
Quiet and Disturbed Time Characteristics of Blanketing Es (Esb) During Solar Cycle 23

Yadav, Virendra; Kakad, Bharati; Bhattacharyya, A.; Pant, T.K. (2017)

A sporadic E layer with dense ionization blocks the upper ionospheric layers in ionosonde observations and it is called, blanketing sporadic E (Esb). Although earlier studies have demonstrated that Esb occurrence is ...
Generation of ion acoustic solitary waves through wave breaking in superthermal plasmas

Lotekar, Ajay; Kakad, Amar; Kakad, Bharati (2017)

Space plasmas provide abundant evidence of a highly energetic particle population that results in a long-tailed non-Maxwellian distribution. Such plasmas can be effectively modeled with kappa distribution. The superthermal ...
Particle trapping and ponderomotive processes during breaking of ion acoustic waves in plasmas

Kakad, Amar; Omura, Yoshiharu (2017)

Recent fluid simulations show that the ponderomotive potentials and ponderomotive frequencies of electrons and ions can be used as proxies to identify steepening and breaking of the ion acoustic solitary waves (IASWs) ...
Coseismic Traveling Ionospheric Disturbances during the Mw 7.8 Gorkha, Nepal, Earthquake on 25 April 2015 From Ground and Spaceborne Observations

Tulasiram, S.; Sunil, P.S.; Ravi Kumar, M.; Su, S.-Y.; Tsai, L.C.; Liu, C.H. (2017)

Coseismic traveling ionospheric disturbances (CTIDs) and their propagation characteristics during Mw 7.8 Gorkha earthquake in Nepal on 25 April 2015 have been investigated using a suite of ground‐based GPS receivers and ...
Ionospheric winter anomaly and annual anomaly observed from Formosat-3/COSMIC Radio Occultation observations during the ascending phase of solar cycle 24

Gowtam, V. Sai; Tulasiram, S. (2017)

Ionospheric winter and annual anomalies have been investigated during the ascending phase of solar cycle 24 using high-resolution global 3D – data of the FORMOSAT – 3/COSMIC (Formosa satellite – 3/Constellation Observing ...
Impact of Sudden Stratospheric Warming of 2009 on the Equatorial and Low-Latitude Ionosphere of the Indian Longitudes: A Case Study

Yadav, Sneha; Pant, Tarun K.; Choudhary, R.K.; Vineeth, C.; Sunda, Surendra; Kumar, K.K.; Shreedevi, P.R.; Mukherjee, S. (2017)

Using the equatorial electrojet (EEJ)-induced surface magnetic field and total electron content (TEC) measurements, we investigated the impact of the sudden stratospheric warming (SSW) of January 2009 on the equatorial ...
Salient features of the dayside low latitude ionospheric response to the main phase step-I of the 17 March 2015 geomagnetic storm

Bagiya, Mala S.; Sunil, A.S.; Chakrabarty, D.; Sunda, Surendra (2017)

Based on TEC observations by India’s GPS Aided GEO Augmented Navigation (GAGAN) GPS network, we report the dayside low latitude ionospheric variations over the Indian region during the moderate main phase step-I of the ...
Long term variabilities and tendencies of mesospheric lunar semidiurnal tide over Tirunelveli (8.7 deg N, 77.8 deg E)

Sathishkumar, S.; Sridharan, S.; Kutty, P.V. Muhammed; Gurubaran, S. (2017)

The medium frequency radar deployed at Tirunelveli (8.7 N, 77.8 E), which is located near the southmost tip of peninsular India, have been providing continuous data from the year 1993 to the year 2012 that helped to ...

Now showing items 261-280 of 941

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