IIAP Publications: Recent submissions

  • Plasma heating in a sheared magnetic field 
    Krishan, V (Indian Academy of Sciences, 1981-12)
    The mechanism of spatial resonance of Alfven waves for heating a collisionless plasma is studied in the presence of a twisted magnetic field. In addition to modifying the equilibrium condition for a cylindrical plasma, the ...
  • Velocity Oscillations in the Solar Atmosphere 
    Bhattacharyya, J. C (Solar Physics, Vol. 24, No. 2, pp. 274 - 287, 1972-06)
    From a series of long duration continuous Doppler records of selected spectral lines, characteristics of solar velocity oscillations have been studied. Statistical distribution of the durations of the bursts of oscillations ...
  • Theoretical fringe profiles with crossed Babinet compensators in testing concave aspheric surfaces 
    Saxena, A. K; Lancelot, J. P (Optical Society of America., 1982)
    This paper presents the theory for the use of crossed Babinet compensators in testing concave aspheric surfaces. Theoretical fringe profiles for a sphere and for an aspheric surface with primary aberration are shown. ...
  • Holographic cylindrical grating for cosmic X-ray and XUV spectroscopy in grazing incidence 
    Singh, M; Singh, S (Optical Society of America, 1980-10)
    The theory of the holographically prepared grating on a cylindrical surface has been developed, to be applicable in grazing incidence, in a convergent beam of light and in transmission in the objective mode for the design ...
  • On the relationship between pulsars and supernova remnants 
    Kochhar, R. K (Indian Academy of Sciences, 1981-03)
    We propose that single stars in the mass range 4–6·5M ⊙, that explode as Supernovae of Type I, are totally disrupted by the explosion and form shell-type remnants. More massive single stars which explode as Supernovae of ...
  • Influence of solar wind variability of the recurrence of droughts 
    Venkatakrishnan, P (D. Reidel Publishing Co, 1982-11)
    The observed effects of solar flares and interplanetary sector crossings seem to indicate that particle precipitation in the earth's upper atmosphere decreases cyclonic activity in the troposphere. As an extrapolation to ...
  • A "variable" stellar object in a variable blue nebula V-V 1-7 
    Kameswara Rao, N; Gilra, D. P (The Observatory, 1981-08)
  • The structure of the Cygnus Loop at 34.5 MHz 
    Sastry, Ch. V; Shevgaonkar, R. K; Dwarakanath, K. S (Indian Academy of Sciences, 1981-09)
    The large supernova remnant Cygnus Loop was observed at 34.5 MHz with a low-frequency radio telescope at Gauribidanur, India. The structure of the object is presented on a radio map with a resolution of 26 arcmin x 40 ...
  • Plasma acceleration by ion-acoustic turbulence 
    Krishan, V (Kluwer Academic Publishers, 1980-12)
    An energetic proton beam passing through a stationary ionized medium, excites ion-acoustic turbulence. The ion-acoustic instability saturates due to the non-linear indirect wave-particle scattering. The electric field ...
  • 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 ...
  • A time dependent model for spicule flow 
    Hasan, S. S; Venkatakrishnan, P (Kluwer Academic Publishers, 1981-09)
    A time dependent model for the flow of gas in a spicule is studied. In this model, the flow occurs in a magnetic flux sheath. Starting from hydrostatic equilibrium, the flux sheath is allowed to collapse normal to itself. ...
  • Observations and interpretation of solar decametric absorption bursts 
    Gopalswamy, N; Thejappa, G; Sastry, Ch. V (Indian Academy of Sciences, 1983-09)
    The observations of intensity reductions or absorption bursts in the solar decametric radio-continuum are reported. The reductions are interpreted as the absorption of continuum radiation by a shock-generated ion sound ...
  • On the correlation between exciter duration and decay constant of solar decameter Type III radio bursts 
    Subramanian, K. R; Krishan, V; Sastry, Ch. V (Kluwer Academic Publishers, 1981-04)
    It is observed that while there exists a strong correlation between the decay constant and the exciter duration for isolated type III radio bursts, it is absent for those type III radio bursts which are preceded by type ...
  • Observations of the supernova remnants HB 9 and IC 443 at 34.5 MHz 
    Dwarakanath, K. S; Shevgaonkar, R. K; Sastry, Ch. V (Indian Academy of Sciences, 1982-06)
    The results of observations of the two SNRs HB 9 and IC 443 are discussed. A map of HB 9 is presented whose main features are an elongation in the northerly direction and a strong region at the center of the map. The ...
  • Density dependence of solar emission lines of boron-like ions 
    Dwivedi, B. N; Raju, P. K (Kluwer Academic Publishers, 1980-11)
    Steady state level densities of 20 levels of the boron-like ions Mg VII and Si X have been computed as a function of electron density and temperature. Collisional and spontaneous radiative processes have been accounted ...
  • Supernovae and the AP Phenomenon 
    Rajamohan, R; Pati, A. K (International Astronomical Union, 1980)
  • Time structure of solar decametre Type III radio bursts 
    Thejappa, G; Sastry, Ch. V (Indian Academy of Sciences, 1982-06)
    The time structure of solar radio decameter Type III bursts occurring during the periods of enhanced emission is investigated. It is found that the time profiles can take a variety of forms of which three distinct types ...
  • Supernovae and the AP phenomenon 
    Rajamohan, R; Pati, A. K (Indian Academy of Sciences, 1980-12)
    We put forward evidence that relates the phenomenon of the chemically peculiar stars of the upper main sequence to Supernovae explosions in young clusters. In the Upper Scorpius region we find that a supernova shell has ...
  • CA II K2V spectral features and their relation to small-scale photospheric magnetic fields 
    Sivaraman, K. R; Livingston, W. C (D. Reidel Publishing Co.,, 1982-10)
    Although the Ca ii K232 network is known to be cospatial with magnetic elements there has been doubt as to the magnetic origin of the fainter K2V points. We demonstrate that weak magnetic elements also lie at the roots of ...
  • Spot activity in the RS CVn binary HR 1099 
    Mekkaden, M. V; Raveendran, A. V; Mohin, S (Indian Academy of Sciences, 1982-03)
    UBV photometry of HR 1099 obtained during the 1979-80 and 1980-81 observing seasons is presented. An analysis of the available data shows that the brightness at the light curve maximum increases as the wave amplitude ...

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