Upper_Atmosphere: Recent submissions

Now showing items 1-20 of 933

Calculating the High‐Latitude Ionospheric Electrodynamics Using a Machine Learning‐Based Field‐Aligned Current Model

Gowtam, V. Sai; Connor, Hyunju; Kunduri, Bharat S. R.; Raeder, Joachim; Laundal, Karl M.; Tulasi Ram, S.; Ozturk, Dogacan S.; Hampton, Donald; Chakraborty, Shibaji; Owolabi, Charles; Keesee, Amy (2024-03)

We introduce a new framework called Machine Learning (ML) based Auroral Ionospheric electrodynamics Model (ML‐AIM). ML‐AIM solves a current continuity equation by utilizing the ML model of Field Aligned Currents of Kunduri ...
Assessing the past and future dynamics of the Asian summer monsoon: Insights from palaeomonsoon synthesis and CMIP6 data

Shekhar, Mayank; Sharma, Aka; Pandey, Pushpendra; Sharma, Anupam; Dimri, A.P. (2024-07)

The Asian summer monsoon is one of the active synoptic scale weather phenomena, and has significant socioeconomic implications. A vast population relies on the associated precipitation, mostly dominating the agricultural ...
Impacts of different boundary layer parameterization schemes on simulation of meteorology over Himalaya

Singh, Jaydeep; Singh, Narendra; Ojha, Narendra; Dimri, A.P.; Singh, Ravi S. (2024-03)

The boundary layer plays a vital role in governing the local atmospheric dynamics and meteorology, including the vertical transport of moisture, momentum, energy, and air pollutants. Hence, accurate parameterization of the ...
Stability of Kinetic Alfven Wave (Kaw) In A Cometary Plasma With Streaming Electrons And Protons

Sreekala, G.; Sebastian, Sijo; Michael, Manesh; Devi, E. Savithri; Anilkumar, C. P.; Venugopal, Chandu (2018)

206Alfvénic turbulence has been detected by Comet Halley at spacecrafts Giotto and Vega and by Comet Giacobini-Zinner at International Cometary Explorer (ICE). We have studied the KAW instability driven by field aligned ...
A Theoretical Model for the Generation of Kinetic Alfvén Waves in the Earth’s Magnetosphere by Ion Beam and Velocity Shear

Barik, K. C.; Singh, S. V.; Lakhina, G. S. (2019)

A generation mechanism for kinetic Alfvén waves (KAWs) by ion-beam and velocity shear is discussed. For this, a three-component plasma model, consisting of cold background ions, hot electrons, and hot ion beams ...
Linear macroscopic instabilities in space plasmas

Lakhina, G. S. (1994)

Some of the linear macroinstabilities which can play important roles in space plasmas like the Earth's ionosphere and magnetosphere are discussed. Starting from the basic concept of plasma instabilities, we proceed to ...
Mesosphere/lower thermosphere prevailing wind model

Portnyagin, Yu.; Solovjova, T.; Merzlyakov, E.; Forbes, J.; Palo, S.; Ortland, D.; Hocking, W.; MacDougall, J.; Thayaparan, T.; Manson, A.; Meek, C.; Hoffmann, P.; Singer, W.; Mitchell, N.; Pancheva, D.; Igarashi, K.; Murayama, Y.; Jacobi, Ch.; Kuerschner, D.; Fahrutdinova, A.; Korotyshkin, D.; Clark, R.; Taylor, M.; Franke, S.; Fritts, D.; Tsuda, T.; Nakamura, T.; Gurubaran, S.; Rajaram, R.; Vincent, R.; Kovalam, S.; Batista, P.; Poole, G.; Malinga, S.; Fraser, G.; Murphy, D.; Riggin, D.; Aso, T.; Tsutsumi, M. (2004)

The mesosphere/lower thermosphere (MLT) wind data from the 46 ground-based (GB) MF and meteor radar (MR) stations, located at the different latitudes over the globe, and the space-based (SB) HRDI data were used for ...
Solitary waves observed in the auroral zone: the Cluster multi-spacecraft perspective

Pickett, J. S.; Kahler, S. W.; Chen, L.-J.; Huff, R. L.; Santolik, O.; Khotyaintsev, Y.; Décréau, P. M. E.; Winningham, D.; Frahm, R.; Goldstein, M. L.; Lakhina, G. S.; Tsurutani, B. T.; Lavraud, B.; Gurnett, D. A.; André, M.; Fazakerley, A.; Balogh, A.; Rème, H. (2004)

We report on recent measurements of solitary waves made by the Wideband Plasma Wave Receiver located on each of the four Cluster spacecraft at 4.5-6.5RE (well above the auroral acceleration region) as they cross field lines ...
An observation-driven model of the equatorial ionosphere - DEOS rocket campaign study

Sojka, J.J.; Eccles, J.V.; Thiemann, H.; Sridharan, R.; Lakhina, G. S.; Rao, P. B.; Schunk, R.W. (2002)

An ionosphere model for a single, low-latitude, magnetic meridion is driven with observation-determined drivers to produce electron density specifications containing day to day ionospheric weather. The drivers are vertical ...
Variations of ULF and VLF During Moderate Geomagnetic Storm At Equatorial Region

Ahmad, S. N. A.; Jusoh, M. H.; Kasran, F. A. M.; Abdullah, M.; Veenadhari, B.; Uozumi, T.; Abe, S.; Yoshikawa, A.; Cardinal, M. G. (2015)

This paper presents variations of Ultra Low Frequency (ULF) and Very Low Frequency (VLF) during moderate geomagnetic storm using ground based observatories, Magnetic Data Acquisition System (MAGDAS)/Circum-Pan ...
Amplitude enhancement of SC(H) events in the South Atlantic anomaly region

Trivedi, N.B.; Abdu, M.A.; Pathan, B.M.; Dutra, S.L.G.; Schuch, N.J.; Santos, J.C.; Barreto, L.M. (2005)

South Atlantic Magnetic Anomaly (SAMA) due to its weak total geomagnetic field F is known to be a sink of trapped charged particles from the inner radiation belt during both magnetically quiet and disturbed periods. ...
Large amplitude dust-acoustic double layers in non-thermal plasmas with positive and negative dust

Maharaj, S. K.; Bharuthram, R.; Singh, S. V.; Pillay, S. R.; Lakhina, G. S. (2011)

The existence of large amplitude double layers in a plasma composed of cold negative dust, adiabatic positive dust, non-thermal ions and Boltzmann electrons is investigated using the Sagdeev pseudopotential technique. ...
Observational evidences on the influences of tropical lower atmospheric 20 day oscillation on the ionospheric equatorial electrojet

Ramkumar, T.K.; Bhavanikumar, Y.; Rao, D. Narayana; Gurubaran, S.; Babu, A. Narendra; Ghosh, A.K.; Rajaram, R. (2006)

As an observational evidence, it is reported that long period oscillations near 21- and 30-days generated in the lower atmosphere (troposphere and lower stratosphere) in the Indian tropical regions have possible influences ...
Numerical simulation of twisted solar corona

Parhi, S.; Pandey, B. P.; Goossens, M.; Lakhina, G. S. (1998)

The solar corona supports a variety of waves generated by convective upwelling motion in the photosphere. In order to explain the observed coronal temperature profile, resonant absorption of MHD waves by coronal plasma ...
A generation mechanism of chorus emissions using BWO theory

Singh, Ashutosh K.; Patel, R P; Singh, R; Singh, K K; Singh, A K (2010)

In this paper, discrete VLF chorus emissions recorded at low latitude ground station Jammu (geomag. Lat. = 220 26/ N, L = 1.17) are reported and their characteristics based on complete spectral analysis have been carried ...
Proposal for creating a centre for research in solar-terrestrial physics as an interdepartmental activity during IHY at Shivaji university, Kolhapur (16.40◦N, 74.15◦E)

Bhonsle, R. V.; Sharma, A. K.; Patil, P. T.; Powar, Arun S.; Waichal, P. P.; Vhatkar, R. S.; Patil, K. J.; Samant, J. S. (2007)

This note describes teaching and R & D activities presently being carried out in the solar-terrestrial Physics at the Space Science laboratory, Department of Physics, Shivaji University, Kolhapur. A variety of solar ...
Apposite of atmospheric electric parameters with the energy coupling function (ε) during geomagnetic storms at high latitude

Anil Kumar, C.P.; Panneerselvam, C.; Nair, K.U.; Jeyakumar, H. Johnson; Selvaraj, C.; Gurubaran, S.; Venugopal, C. (2009-02)

In this paper we are concerned with the variation of the atmospheric electric field and the airearth current due to the excessive power generated by the solar wind-magnetosphere dynamo during geomagnetic storms, recorded ...
Challenges of predicting low-latitude ionospheric scintillations

Bhattacharyya, Archana (2019)

Two regions of the globe that are most affected by ionospheric scintillations are the auroral region and the low-latitude region encompassing the dip equator. Our present-day dependence on satellite-based communication and ...
Signatures of quasi-2-day planetary waves in the equatorial electrojet: results from simultaneous observations of mesospheric winds and geomagnetic eld variations at low latitudes

Gurubaran, S.; Ramkumar, T.K.; Sridharan, S.; Rajaram, R. (2001)

Observations of mesospheric winds in the altitude region 84–98 km with the medium frequency (MF) radar located close to the magnetic equator at Tirunelveli ( geographic, 0.35°N magnetic dip), India, and the ground-based ...
Role of Lightning Activity in Deciphering Atmospheric Gravity Waves (AGWs) Induced D‐Region Ionospheric Perturbations During Extremely Severe Cyclonic Storm (ESCS) Fani

Patil, Omkar M.; Moharana, Sidha S.; Maurya, Ajeet K.; Parihar, Navin; Singh, Rajesh; Dimri, A. P. (2024-04)

The study presents detailed meteorological characteristics of extremely severe cyclonic storm (ESCS) Fani, and subsequent Atmospheric Gravity Waves(AGWs) induced D‐region ionospheric perturbations and the role of lightning ...

Now showing items 1-20 of 933

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