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Browsing IIAP Publications by Issue Date

Browsing IIAP Publications by Issue Date

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  • Photometry of Zeta Aurigae during the 1977 and 1979-80 Eclipses 
    Mohin, S; Raveendran, A. V; Mekkaden, M. V (Indian Institute of Astrophysics, Bangalore, 1980)
    UBV photometry of Zeta Aurigae during the 1977 and 1979-80 eclipses is presented. From an analysis of the available photometry, it is concluded that the long term intrinsic variation in the brightness of the late-type super ...
  • Flow of Gas along a Magnetic field with Time-Dependent Geometry 
    Hasan, S. S; Venkatakrishnan, P (Indian Institute of Astrophysics, Bangalore, 1980)
    The flow of gas along a magnetic field with time dependent geometry has been studied. It is seen that the velocity of the flow in the direction of the magnetic field depends both on the magnitude of the velocity of flow ...
  • Fluxvector Splitting of the Inviscid Radiation Gas Dynamic Equations 
    Peraiah, A (Indian Institute of Astrophysics, Bangalore, 1980)
    We have analysed various schemes for the iterative simultaneous solution of the inviscid gas dynamic equations. We have considered the problem from the point of view of the stellar atmospheres. The difference between ...
  • Automated Microdensitometer 
    Viswanath, C (Indian Institute of Astrophysics, Bangalore, 1980)
    An interface to a Carl Zeiss microdensitometer and the HCL's micro-computer MICRO 2200 has been built to digitize, log, and process the analog variable density information on photographic plates. The automated process ...
  • 1.5M Aluminizing Plant of the Indian Institute of Astrophysics 
    Saxena, A. K; Jayarajan, A. P; Kumar, K (Indian Institute of Astrophysics, Bangalore, 1980)
    The design and features of 1.5m vacuum coating plant an in house facility at the Kavalur Observatory for periodic aluminizing of astronomical optics are described. A typical performance data is given.
  • On the growth and decay of blanketing sporadic-E layers 
    Sastri, J. H (The Council of Scientific and Industrial Research, 1980-02)
    Vertical incidence ionospheric soundings with a C-3 ionosonde were performed at Kodaikanal (dip 3.5 deg N) at one minute intervals during October 1974-January 1975 with a view to monitoring the small scale fluctuations in ...
  • Direct generation of electromagnetic radiation from a beam-plasma system 
    Krishan, V (Institute of Physics, 1980-02)
    A possible mechanism for the direct generation of electromagnetic modes of frequencies near the electron plasma frequency, is suggested. The spatial variation of the interplanetary magnetic field seems to play an essential ...
  • A Degenerate Parton Gas Model for the Proton 
    Sivaram, C; Dixit, V. V (Japan Science and Technology Agency, 1980-02)
  • Complete solution for a two-dimensional tanh-conductivity arc 
    Das, G. C (Indian Academy of Sciences, 1980-03)
  • Nucleus of NGC 2903 
    Prabhu, T. P (D.Reidel Publishing Co.,, 1980-04)
    The nucleus of NGC 2903 is identified on near infrared photographs. The energy distribution of this nucleus in the visual region of the spectrum is estimated from available observations. The continuum compares well with ...
  • The predicted infrared spectrum of ZrO and its possible presence in S stars 
    Murty, P. S (D. Reidel Publishing Company, 1980-04)
    The unidentified absorption feature at 9730 ± 5 A observed in the spectra of pure S stars is provisionally identified with the predicted 9732 A (0, 0) band of the e `IT-c `z\ transition of ZrO molecule. Relative band ...
  • Photometry of HD 166181 
    Mekkaden, M. V; Raveendran, A. V; Mohin, S (Konkoly Observatory, 1980-05)
  • Ionospheric storm of 4 - 6 December 1958 in the Indian equatorial region. 
    Sastri, J. H (The Council of Scientific and Industrial Research, 1980-06)
    The characteristics of the ionospheric storm of 4-6 Dec. 1958 in the Indian sector (60-85°B) are studied using published data from ten ionospheric stations distributed from high mid latitudes to dip equator. It is shown ...
  • On the relationship between geomagnetic activity and spread-F configurations at Kodaikanal 
    Sastri, J. H; Sasidharan, K (European Geophysical Society, 1980-06)
    A study is made of the seasonal and sunspot cycle trends in the effect of geomagnetic activity on the nocturnal occurrence of spread-F configurations at Kodaikanal (Geo. Mag. Lat. 0.60 N, dip 3.50 N), using ionogram data ...
  • Observations and interpretation of solar decameter type IIIb radio bursts 
    Krishan, V; Subramanian, K. R; Sastry, Ch. V (Kluwer Academic Publishers, 1980-06)
    Solar decameter bursts of Type IIIb are observed with a multichannel radiometer at wavelengths around 12m. The time and frequency resolutions were 10 ms and 100 kHz. Observations on the time structure of these bursts are ...
  • Interplanetary magnetic field and equatorial ionosphere 
    Sastri, J. H (European Geophysical Society, 1980-06)
    Relationships between events in the interplanetary magnetic field and the equatorial ionosphere are investigated. Simultaneous data showing sudden northward transitions of the interplanetary magnetic field and nighttime ...
  • A note on the occurrence of N echoes in the equatiorial region 
    Sastri, J. H (Indian Academy of Sciences, 1980-07)
  • UBV Observations of R-Coronae Type Variables and Related Objects 
    Kameswara Rao, N (D. Reidel Publishing Co., 1980-07)
    UBV observations obtained during the period 1972-73 are presented for the following five R CrB stars: GU Sgr, SU Tau, XX CAm, DZ And, V973 Oph, and the hydrogen-poor, carbon-rich stars BD + 10 deg 2179 and HD 137613. ...
  • Magnetohydrodynamic equilibrium and stability of pre-flare loops - Constant pitch field 
    Hasan, S. S (D. Reidel Publishing Co.,, 1980-08)
    The equilibrium and stability of a loop in which energy storage occurs prior to a solar flare is discussed. Working on the hypothesis, that the onset of the flare begins only after sufficient magnetic energy has been stored ...
  • Radiation from an electron beam-magnetoplasma 
    Krishan, V (Institute of Physics, 1980-08)
    The possibility of direct generation of electromagnetic radiation at and near electron plasma frequency from an electron beam-magnetoplasma system is explored. The role of the electron beam is replaced by the electron ...

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