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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • The extraterrestrial Raman-scattering 
    Krishan, V (Indian Academy of Sciences, 1993-03-10)
    The diagnostic potential of the Raman scattering of the electro-magnetic radiation has been realized in an all embracing manner in terrestrial phenomena. Our knowledge of the remote reaches of the universe comes almost ...
  • Extremal charged black holes, dark matter and dark energy 
    Sivaram, C; Arun, K; Prasad, A (Springer, 2018-10)
    Formation of black holes may be constrained by intrinsic parameters characterizing them such as electric charge. Here we discuss the effects of a relatively minute excess of charge on extremal black hole formation and the ...
  • The Extreme Solar Activity during October–November 2003 
    Hiremath, K. M; Lovely, M. R; Kariyappa, R (Indian Academy of Sciences, 2006-09)
    The positional measurements of sunspots from the Kodaikanal Observatory and Solar Geophysical data are used to study the association between occurrence of the abnormal activities of big sunspot groups that were observed ...
  • The extreme ultraviolet deficit: jet connection in the quasar 1442+101 
    Punsly, B; Marziani, P; Kharb, P; O'Dea, C. P; Vestergaard, M (IOP Publishing, 2015-10-10)
    In previous studies, it has been shown that the long-term time-averaged jet power, Q, is correlated with spectral index in the extreme ultraviolet (EUV), αEUV (defined by n ~ n-a F EUV computed between 700 and 1100 Å ). ...
  • Extreme-energy cosmic rays: hints to new physics beyond the standard model? 
    Bhattacharjee, P; Sigl, G (Springer, 2001)
    The observed extreme energy cosmic ray (EECR) events above 10(20) eV are difficult to explain within tile standard scenario of origin of cosmic rays in which charged particles are accelerated in magnetized shocks in powerful ...
  • f Gravity and gravitational singularities 
    Sivaram, C; Sinha, K. P; Lord, E. A (Nature Publishing Group, 1974-06)
    TRAUTMAN has postulated1 that the usual space-time singularity occurring in classical cosmological models and in the gravitational collapse of massive objects could be averted if intrinsic spin effects are incorporated ...
  • f-gravity and Dirac's large numbers hypothesis 
    Sivaram, C; Sinha, K. P (Elsevier, 1976-01)
    The identification of the strong f-gravity metric with Dirac's atomic metric and the large value of its coupling constant, i.e. Gf 10/sup39 GN (GN being Newtonian constant) provides the physical basis for the large numbers ...
  • F-region changes associated with the solar flare of 23 February 1956 
    Bhargava, B. N; Subrahmanyan, R. V (Elsevier Ltd., 1962-04)
  • F-region oscillations observed during October 24, 1995 solar eclipse at Waltair 
    Rao, B. M; Anhjaneyulu, P (Indian Institute of Astrophysics, Bangalore, 1997)
    Measurements of changes in phase path/Doppler of HF signals on 5.5 MHz from F-region of the ionosphere are carried-out using coherent pulsed Doppler radar. Preliminary analysis of the data show large deviations in phase ...
  • Fabrication and characterization of SLG/Mo/CZTS/CdS/i-ZnO/Al:ZnO/Al thin film solar cell device 
    Suman, R; Revathy, M. S; Priyal, M; Chitravel, T; Kumar, T. P (National Institute of Research and Development for Optoelectronics, 1905-07)
    A cost effective p-type Copper zinc tin selenide Cu2ZnSnSe4 (CZTSe) thin film was fabricated on molybdenum (Mo) coated soda lime glass substrate by sputtering method followed by rapid thermal processed (RTP) selenization. ...
  • Fabrication of Gradient-Index lens by Ion-Exchange in Glass 
    Masalkar, P. J; Rao, V. V; Sirohi, R. S (Indian Institute of Astrophysics, Bangalore, 1991)
    GRIN lenses have been fabricated using Ag/sup+/ < -- > Na/sup+/ ion-exchange in glass. The fabrication process and characterization of GRIN lenses are discussed. The refractive index profile was studied on the Mach-Zehnder ...
  • Fabry-Perot based narrow band imager for solar filament observations 
    Sajal Kumar Dhara; Ravindra, B; Banyal, R. K (IOP Publishing, 2016-01)
    We have recently developed a narrow band imager (NBI) using a n air gap based Fabry-P ́erot (FP) interferometer at the Indian Institute of Astrophysic s, Bangalore. Narrow band imaging is achieved by using an FP ...
  • Fabry-Perot interferometric observations of the coronal red and green lines during the 1983 Indonesian eclipse 
    Chandrasekhar, T; Ashok, N. M; Desai, J. N; Pasachoff, J. M; Sivaraman, K. R (Optical society of America, 1984-02)
    A dual-channel Fabry-Perot interferometric system was used to study simultaneously the coronal emission lines at 5303 Å (Fe XIV) and at 6374 Å (Fe X). Initial results indicate an emission corona confined largely within 1.2 ...
  • Fabry-Perot Interferometric Observations of the Solar Corona in the Green Line 
    Raju, K. P; Singh, J; Muralishankar, S (Indian Institute of Astrophysics, Bangalore, 1997)
    An imaging Fabry-Perot interferometer was designed and used for coronal observations in the green line (FeXIV) 5303 Armstrong. The observations were carried our at Nim Ka Thana, Rajasthan, India during the total solar ...
  • Facilities at Indian Institute of Astrophysics and New Initiatives 
    Bhatt, B. C (Societe Royale des Sciences de Liege, 2018-04)
    The Indian Institute of Astrophysics is a premier national institute of India for the study of and research into topics pertaining to astronomy, astrophysics and related subjects. The Institute’s main campus in Bangalore ...
  • Fading and variations in the spectrum of the central star of the very young planetary nebula SAO 244567 (Hen 1357). 
    Parthasarathy, M; Garcia-Lario, P; de Martino, D; Pottasch, S. R; Kilkenny, D; Martinez, P; Sahu, K. C; Reddy, B. E; Sewell, B. T (EDP Sciences, 1995-08)
    The optical spectrum of SAO 244567 obtained in 1971 shows that it was a post-AGB B1 or B2 supergiant at that time. It has turned into a planetary nebula (PN ) within the last 20 years. The IUE ultraviolet spectra obtained ...
  • Fading and variations in the spectrum of the central star of the young Planetary Nebula SAO 244567 (Hen 1357) 
    Parthasarathy, M; Garcia-Lario, P; de Martino, D; Pottasch, S. R; de Cordoba, S. F (International Astronomical Union, 1997)
  • Fading of light maximum and linear polarization variation in the carbon Mira R Leporis 
    Raveendran, A. V (Royal Astronomical Society, 2002-11)
    Polarimetry of R Lep obtained over the years 1991-2002 is presented. During this period the star underwent an episode of fading of the brightness at light maximum, after an interval of about 35 yr. An analysis of the data ...
  • Faint BVRI Photometric Sequences in Selected Fields 
    Saha, A; Dolphin, A. E; Thim, F; Whitmore, B (The Astronomical Society of the Pacific, 2005-01)
    The results from work done to extend the Johnson-Cousins BVRI photometric standard sequence to faint levels of V~21 mag in compact fields is presented. Such calibration and extension of sequences is necessary to fill a ...
  • The far-infrared (IRAS) excess in BQ() and related stars 
    Parthasarathy, M; Pottasch, S. R (European Southern Observatory, 1989-11)
    The FIR IRAS flux distributions and color of 12 peculiar emission-line objects (HD 51585, Hen 401, Hen 591, Hen 1013, He 2-138, M 2-9, HD 326971, Hen 1357, Hen 1428, Tc 1, Hen 1475, and M 1-26) are found to be similar to ...

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