Items where Author is "Viswanathan, K. S."

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Number of items: 73.

Ramkumar, T. K. ; Gurubaran, S. ; Rajaram, R. ; Tiwari, D. ; Viswanathan, K. S. (2010) A comparison study of zonal drift velocities measurements as seen by MF spaced antenna and HF doppler radar in the Indian dip equatorial mesospheric and lower thermospheric (80-100 km) region Journal of Geophysical Research, 115 . pp. A02306-A02311. ISSN 0148-0227

Jovan Jose, K. V. ; Gadre, Shridhar R. ; Sundararajan, K. ; Viswanathan, K. S. (2007) Effect of matrix on IR frequencies of acetylene and acetylene-methanol complex: infrared matrix isolation and ab initio study Journal of Chemical Physics, 127 (10). pp. 104501_1-104501_10. ISSN 1674-0068

Manju, G. ; Viswanathan, K. S. (2005) Response of the equatorial electrojet to solar flare related X-ray flux enhancements Earth Planets and Space (EPS), 57 (3). pp. 231-242. ISSN 1343-8832

Patra, A. K. ; Tiwari, D. ; Sripathi, S. ; Rao, P. B. ; Sridharan, R. ; Devasia, C. V. ; Viswanathan, K. S. ; Subbarao, K. S. V. ; Sekar, R. ; Kherani, E. A. (2005) Simultaneous radar observations of meter-scale F region irregularities at and off the magnetic equator over India Journal of Geophysical Research, 110 (A2). pp. A02307_1-A02307_11. ISSN 0148-0227

Tiwari, D. ; Patra, A. K. ; Devasia, C. V. ; Sridharan, R. ; Jyoti, N. ; Viswanathan, K. S. ; Subbarao, K. S. V. (2004) Radar observations of 8.3-m scale equatorial spread F irregularities over Trivandrum Annales Geophysicae, 22 (3). pp. 911-922. ISSN 0992-7689

Tiwari, Diwakar ; Patra, A. K. ; Viswanathan, K. S. ; Jyoti, N. ; Devasia, C. V. ; Subbarao, K. S. V. ; Sridharan, R. (2003) Simultaneous radar observations of the electrojet plasma irregularities at 18 and 54.95 MHz over Trivandrum, India Journal of Geophysical Research, 108 (A10). pp. SIA3_1-SIA3_13. ISSN 0148-0227

Sundararajan, K. ; Viswanathan, K. S. ; Kulkarni, Anant D. ; Gadre, Shridhar R. (2002) H...π complexes of acetylene-benzene: a matrix isolation and computational study Journal of Molecular Structure, 613 (1-3). pp. 209-222. ISSN 0022-2860

Devasia, C. V. ; Jyoti, N. ; Subbarao, K. S. V. ; Viswanathan, K. S. ; Tiwari, Diwakar ; Sridharan, R. (2002) On the plausible linkage of thermospheric meridional winds with the equatorial spread F Journal of Atmospheric and Solar-Terrestrial Physics, 64 (1). pp. 1-12. ISSN 1364-6826

Sridharan, R. ; Devasia, C. V. ; Jyoti, N. ; Tiwari, Diwakar ; Viswanathan, K. S. ; Subbarao, K. S. V. (2002) Effects of solar eclipse on the electrodynamical processes of the equatorial ionosphere: a case study during 11 August 1999 dusk time total solar eclipse over India Annales Geophysicae, 20 (12). pp. 1977-1985. ISSN 1432-0576

Kulkarni, Anant D. ; Sundararajan, K. ; Sankaran, K. ; Viswanathan, K. S. ; Gadre, Shridhar R. (2002) H-π complexes of acetylene-ethylene: a matrix isolation and computational study Journal of Physical Chemistry A, 106 (8). pp. 1504-1510. ISSN 1089-5639

Sekar, R. ; Kherani, E. A. ; Viswanathan, K. S. ; Devasia, C. V. ; Subbarao, K. S. V. ; Tiwari, D. ; Ramachandran, N. ; Patra, A. K. ; Rao, P. B. (2000) Preliminary results on equatorial spread F irregularities by VHF and HF radars Indian Journal of Radio and Space Physics, 29 (4). pp. 262-271. ISSN 0367-8393

Jemmis, E. D. ; Giju, K. T. ; Sundararajan, K. ; Sankaran, K. ; Vidya, V. ; Viswanathan, K. S. ; Leszczynski, J. (1999) An ab initio and matrix isolation infrared study of the 1:1 C₂H₂-CHCl₃ adduct Journal of Molecular Structure, 510 (1-3). pp. 59-68. ISSN 0022-2860

Sankaran, K. ; Vidya, V. ; Viswanathan, K. S. ; George, Lisa ; Singh, Surjit (1998) Trimethyl phosphate-water interaction: a matrix-isolation infrared and ab initio study The Journal of Physical Chemistry A, 102 (17). pp. 2944-2953. ISSN 1089-5639

Krishna Murthy, B. V. ; Ravindran, Sudha ; Viswanathan, K. S. ; Subbarao, K. S. V. ; Patra, A. K. ; Rao, P. B. (1998) Small-scale (~3 m) E region irregularities at and off the magnetic equator Journal of Geophysical Research, 103 (A9). pp. 20761-20773. ISSN 0148-0227

George, Lisa ; Viswanathan, K. S. ; Singh, Surjit (1997) Ab initio study of trimethyl phosphate: conformational analysis, dipole moments, vibrational frequencies, and barriers for conformer interconversion The Journal of Physical Chemistry A, 101 (13). pp. 2459-2464. ISSN 1089-5639

Hari, S. S. ; Viswanathan, K. S. ; Subbarao, K. S. V. ; Murthy, B. V. Krishna (1996) Equatorial E and F region zonal electric fields in the postsunset period Journal of Geophysical Research, 101 (A4). pp. 7947-7949. ISSN 0148-0227

Panigrahi, B. S. ; Peter, Susy ; Viswanathan, K. S. ; Mathews, C. K. (1995) Fluorescence enhancement of Tb³⁺ in Tb-aromatic acid complexes: correlation of synergistic enhancement with the structure of the ligand Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 51 (13). pp. 2289-2300. ISSN 1386-1425

George, Lisa ; Sankaran, K. ; Viswanathan, K. S. ; Mathews, C. K. (1995) A matrix-isolation infrared study of the adducts of triethyl phosphate with CCl₄, CHCl₃ and CH₂Cl₂ Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 51 (4). pp. 587-593. ISSN 1386-1425

Somayajulu, V. V. ; Viswanathan, K. S. ; Subbarao, K. S. V. ; Cherian, L. (1994) Distortions in the height structure of the equatorial electrojet during counter electrojet events Journal of Atmospheric and Terrestrial Physics, 56 (1). pp. 51-58. ISSN 0021-9169

Reddy, C. A. ; Ravindran, Sudha ; Viswanathan, K. S. ; Murthy, B. V. Krishna ; Rao, D. R. K. ; Araki, T. (1994) Observations of Pc5 micropulsation-related electric field oscillations in the equatorial ionosphere Annales Geophysicae (1988), 12 (6). pp. 565-573. ISSN 0992-7689

Panigrahi, B. S. ; Peter, Susy ; Viswanathan, K. S. ; Mathews, C. K. (1993) Fluorescence enhancement and cofluorescence in complexes of terbium, dysprosium and europium with trimesic acid Analytica Chimica Acta, 282 (1). pp. 117-124. ISSN 0003-2670

Subramanyam, B. ; Viswanathan, K. S. (1993) Second order elastic anomalies in barium titanate from cubic to tetragonal phase transition Pramana - Journal of Physics, 41 (1). pp. 31-39. ISSN 0304-4289

Peter, Susy ; Panigrahi, B. S. ; Viswanathan, K. S. ; Mathews, C. K. (1992) Fluorescence enhancement of dysprosium, europium and terbium using sodium benzoate-trioctylphosphine oxide-Triton X-100 Analytica Chimica Acta, 260 (1). pp. 135-141. ISSN 0003-2670

Viswanathan, K. S. ; Jeeja Ramani, J. C. (1992) Gyrotropic anomalies near a phase transition Physics Letters A, 161 (6). pp. 531-534. ISSN 0375-9601

Viswanathan, K. S. ; Namboothiri, S. P. ; Rao, P. B. (1992) VHF and HF Radar measurements of E and F region plasma drifts at the magnetic equator Journal of Geophysical Research, 97 (A3). pp. 3011-3017. ISSN 0148-0227

Viswanathan, K. S. ; Vikramkumar, B. T. ; Reddy, C. A. (1987) Electric fields and currents in the equatorial electrojet deduced from VHF radar observations- II. Characteristics of electric fields on quiet and disturbed days Journal of Atmospheric and Terrestrial Physics, 49 (2). pp. 193-200. ISSN 0021-9169

Vikramkumar, B. T. ; Rao, P. B. ; Viswanathan, K. S. ; Reddy, C. A. (1987) Electric fields and currents in the equatorial electrojet deduced from VHF radar observations-III. Comparison of observed ΔH values with those estimated from measured electric fields Journal of Atmospheric and Terrestrial Physics, 49 (2). pp. 201-207. ISSN 0021-9169

Somayajulu, V. V. ; Reddy, C. A. ; Viswanathan, K. S. (1987) Penetration of magnetospheric convective electric field to the equatorial ionosphere during the substorm of March 22, 1979 Journal of Geophysical Research, 14 (8). pp. 876-879. ISSN 0148-0227

Pushpahasan, A. ; Viswanathan, K. S. (1986) Ordinary and extraordinary cyclotron waves in metals Pramana - Journal of Physics, 26 (6). pp. 543-554. ISSN 0304-4289

Viswanathan, K. S. (1986) Interaction of second sound with acoustic waves in solids Pramana - Journal of Physics, 27 (1-2). pp. 307-320. ISSN 0304-4289

Pushpahasan, A. ; Viswanathan, K. S. (1985) Focussing and defocussing of ballistic phonons in diamond and Nb₃Sn Pramana - Journal of Physics, 24 (6). pp. 875-886. ISSN 0304-4289

Somayajulu, V. V. ; Reddy, C. A. ; Viswanathan, K. S. (1985) Simultaneous electric field changes in the equatorial electrojet in phase with polar cusp latitude changes during a magnetic storm Geophysical Research Letters, 12 (7). pp. 473-475. ISSN 0094-8276

Vikramkumar, B. T. ; Rao, P. B. ; Viswanathan, K. S. (1984) VHF backscatter radar observations of the equatorial electrojet irregularities - diurnal, seasonal and solar cycle variations Annales Geophysicae (1983), 2 . pp. 495-499. ISSN 0755-0685

Narasimha Iyer, V. ; Viswanathan, K. S. (1983) Solitons in a linear lattice with defects Pramana - Journal of Physics, 20 (5). pp. 415-427. ISSN 0304-4289

Viswanathan, K. S. ; Balachandran Nair, R. ; Rau, P. B. (1983) Simultaneous observations of E and F region electric field fluctuations at the magnetic equator Journal of Atmospheric and Terrestrial Physics, 55 (2). pp. 185-192. ISSN 0021-9169

Venugopal, Chandu ; Viswanathan, K. S. (1982) Near perpendicular propagation of electromagnetic waves in the magnetosphere Planetary and Space Science, 30 (7). pp. 687-694. ISSN 0032-0633

Iyer, V. Narasimha ; Viswanathan, K. S. (1981) Elastic wave surfaces for the (111) plane of cubic crystals Pramana - Journal of Physics, 17 (2). pp. 135-142. ISSN 0304-4289

Viswanathan, K. S. (1981) Elastic wave surfaces and phonon focussing for the A-15 compounds Solid State Communications, 38 (10). pp. 947-948. ISSN 0038-1098

Renuka, G. ; Viswanathan, K. S. (1980) Temperature anisotropy instabilities in a plasma containing cold and hot species in the magnetosphere Planetary and Space Science, 28 (2). pp. 169-176. ISSN 0032-0633

Reddy, C. A. ; Somayajulu, V. V. ; Viswanathan, K. S. (1979) Ionospheric-magnetospheric contributions to storm-time magnetic field changes near dip equator Communications in Mathematical Physics, 281 . pp. 471-474. ISSN 0010-3616

Viswanathan, K. S. (1979) Rotary activity of shear waves under Helicon-phonon interaction Solid State Communications, 31 (10). pp. 725-726. ISSN 0038-1098

Viswanathan, K. S. ; Philip, Jacob (1979) Neutron scattering by anharmonic crystals and the effect of sublattice displacements Pramana - Journal of Physics, 12 (6). pp. 679-697. ISSN 0304-4289

Mayer, D. H. ; Viswanathan, K. S. (1979) A note on the vacuum structure of an SU(2) Yang-Mills theory Communications in Mathematical Physics, 67 (3). pp. 199-203. ISSN 0010-3616

Viswanathan, K. S. ; Renuka, G. (1978) Pitch angle diffusion by bounce resonance Planetary and Space Science, 26 (1). pp. 75-80. ISSN 0032-0633

Viswanathan, K. S. (1977) Anomalous neutron scattering and ferroelectric soft modes Pramana - Journal of Physics, 8 (5). pp. 417-419. ISSN 0304-4289

Philip, Jacob ; Viswanathan, K. S. (1977) Cuspidal edges for elastic wave surfaces for cubic crystals Pramana - Journal of Physics, 8 (4). pp. 348-362. ISSN 0304-4289

Mayer, D. H. ; Viswanathan, K. S. (1977) On the ζ-function of a one-dimensional classical system of hard-rods Communications in Mathematical Physics, 52 (2). pp. 175-189. ISSN 0010-3616

Viswanathan, K. S. ; Nayar, S. R. Prabhakaran (1975) The sublattice displacements and the elastic constants of A-15 compounds Physics Letters A, 51 (6). pp. 355-356. ISSN 0375-9601

Viswanathan, K. S. ; Rajam, S. (1973) The propagation of ultrasonic waves in piezoelectric semiconductors Proceedings of the Indian Academy of Sciences, Section A, 78 (2). pp. 45-56. ISSN 0370-0089

Viswanathan, K. S. ; Revathy, K. (1972) Pitch angle scattering into loss cone by Cyclotron resonance Proceedings of the Indian Academy of Sciences, Section A, 76 (5). pp. 195-206. ISSN 0370-0089

Viswanathan, K. S. ; Dwarakanath, G. S. ; Shanbhag, V. V. (1971) The structure of strong shock waves using the Fokker-Planck model Proceedings of the Indian Academy of Sciences, Section A, 74 (3). pp. 115-132. ISSN 0370-0089

Viswanathan, K. S. ; Dwarakanath, G. S. (1970) Turbulent shock waves in a collision- free plasma Proceedings of the Indian Academy of Sciences, Section A, 71 (3). pp. 119-140. ISSN 0370-0089

Viswanathan, K. S. ; Rajappa, N. (1969) A note on auroral electrons Planetary and Space Science, 17 (5). pp. 1051-1055. ISSN 0032-0633

Rajappa, N. ; Venkatarangan, P. ; Viswanathan, K. S. (1967) The geomagnetic cavity and the Van Allen radiation belts - II Planetary and Space Science, 15 (3). pp. 495-502. ISSN 0032-0633

Viswanathan, K. S. ; Venkatarangan, P. (1966) The geomagnetic cavity and the Van Allen radiation belts Planetary and Space Science, 14 (7). pp. 641-647. ISSN 0032-0633

Viswanathan, K. S. ; Achar, B. N. Narahari (1964) Quantum and correlation corrections to the Thomas-Fermi potential Canadian Journal of Physics / Revue Canadienne de Physique, 42 (11). pp. 2332-2344. ISSN 0008-4204

Viswanathan, K. S. (1962) The many electron wave equation in the Schrödinger-Pauli form Proceedings of the Indian Academy of Sciences, Section A, 55 (5). pp. 261-279. ISSN 0370-0089

Viswanathan, K. S. (1961) The correlated Hartree-Fock equations and the generalised density matrices Proceedings of the Indian Academy of Sciences, Section A, 53 (4). pp. 169-194. ISSN 0370-0089

Viswanathan, K. S. (1960) The Dirac equation for many-electron systems Proceedings of the Indian Academy of Sciences, Section A, 52 (1). pp. 35-45. ISSN 0370-0089

Viswanathan, K. S. (1959) The relativistic theory of chemical binding Proceedings of the Indian Academy of Sciences, Section A, 50 (1). pp. 1-18. ISSN 0370-0089

Viswanathan, K. S. (1958) Anharmonicity of vibration in molecules Proceedings of the Indian Academy of Sciences, Section A, 47 (2). pp. 85-97. ISSN 0370-0089

Viswanathan, K. S. (1957) The theory of the anharmonic oscillator Proceedings of the Indian Academy of Sciences, Section A, 46 (3). pp. 203-217. ISSN 0370-0089

Raman, C. V. ; Viswanathan, K. S. (1955) On the theory of the elasticity of crystals Proceedings of the Indian Academy of Sciences, Section A, 42 (2). pp. 51-70. ISSN 0370-0089

Raman, C. V. ; Viswanathan, K. S. (1955) The elastic behaviour of isotropic solids Proceedings of the Indian Academy of Sciences, Section A, 42 (1). pp. 1-9. ISSN 0370-0089

Raman, C. V. ; Viswanathan, K. S. (1955) A generalised theory of the Christiansen experiment Proceedings of the Indian Academy of Sciences, Section A, 41 (2). pp. 55-60. ISSN 0370-0089

Raman, C. V. ; Viswanathan, K. S. (1955) The theory of the propagation of light in polycrystalline media Proceedings of the Indian Academy of Sciences, Section A, 41 (2). pp. 37-44. ISSN 0370-0089

Viswanathan, K. S. (1955) The theory of the elasticity of crystals Proceedings of the Indian Academy of Sciences, Section A, 41 (3). pp. 98-116. ISSN 0370-0089

Viswanathan, K. S. (1954) The theory of elasticity and of wave-propagation in crystals from the atomistic standpoint Proceedings of the Indian Academy of Sciences, Section A, 39 (4). pp. 196-213. ISSN 0370-0089

Viswanathan, K. S. (1953) The characteristic vibrations of crystal lattices-Part II Proceedings of the Indian Academy of Sciences, Section A, 37 (3). pp. 435-440. ISSN 0370-0089

Viswanathan, K. S. (1953) The characteristic vibrations of crystal lattices. Part I Proceedings of the Indian Academy of Sciences, Section A, 37 (3). pp. 424-434. ISSN 0370-0089

Viswanathan, K. S. (1952) On the characteristic vibrations of linear lattices Proceedings of the Indian Academy of Sciences, Section A, 35 (5). pp. 265-276. ISSN 0370-0089

Viswanathan, K. S. (1952) The characteristic vibrations of a rectangular lattice Proceedings of the Indian Academy of Sciences, Section A, 36 (4). pp. 306-314. ISSN 0370-0089

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