Kodaikanal Observatory, Kodaikanal: Recent submissions

  • Two ribbon flare on April 3, 1980 
    Jain, Rajmal (Indian Institute of Astrophysics, Bangalore, 1988)
    H alpha observations of a two ribbon (TR) flare which were associated with exceptionally high microwave (MW) and hard X-ray emissions are presented and discussed. The good spatial and temporal resolution of the H alpha ...
  • Reduction of Photoheliograms by IBM-PC controlled digitizer 
    Ambastha, A (Indian Institute of Astrophysics, Bangalore, 1988)
    A method is described here to determine heliographic coordinates of sunspots on a photoheliogram using an IBM-PC controlled digitizer. Sunspot proper-motions and buildup of magnetic energy in solar active regions may be ...
  • Peculiar abundances in Solar particle emissions 
    Vahia, M. N (Indian Institute of Astrophysics, Bangalore, 1988)
    In this paper we attempt to show that currently available data on solar flare particle abundances allows studies of abundance and enchancement patterns. In particular we show that solar particles originate from regions of ...
  • Solar X-ray bursts 
    Rausaria, R. R (Indian Institute of Astrophysics, Bangalore, 1988)
    The experimental results of X-ray bursts about spectral characteristics, spatial distribution and directivity measurements carried out with PVO/ISEE-3 spacecraft imaging instruments of HXIS and Hard X-ray burst spectrometers ...
  • Radio emission from the Solar Corona due to shock waves 
    Thejappa, G (Indian Institute of Astrophysics, Bangalore, 1988)
    The slowly drifting solar type II radio bursts are believed to be due to the flare associated shock waves propagating radially outward in the corona. The main observational characteristics of these bursts show that the ...
  • A new technique to study the variability of the Sun 
    Singh, J (Indian Institute of Astrophysics, Bangalore, 1988)
    A method has been developed to take the high resolution spectra in ionized calcium K line at different latitudes and integrated over visible 180/sup0/ longitude. These spectra have been analysed to study the variability ...
  • Long term periodicities of Geomagnetic reversals and stability of ancient Galactic motions of the solar system 
    Negi, J. G (Indian Institute of Astrophysics, Bangalore, 1988)
    Paleomagnetic records can be a rich source of empirical data in characteristic time scales of tremendous interest to solar astronomers and verifiable theories on the earth’s evolution in its galactic environment. The record ...
  • MAGSAT and Geodynamo 
    Singh, B. P (Indian Institute of Astrophysics, Bangalore, 1988)
    Accurate, uniform and global vector magnetic field data obtained by MAGSAT provided a high resolution model of the earth’s magnetic field. It became possible to separate the core and crustal parts in spherical harmonic ...
  • New Instrumentation efforts in Solar studies 
    Bhattacharyya, J. C (Indian Institute of Astrophysics, Bangalore, 1988)
  • Interplanetary Scintillation 
    Alurkar, S. K (Indian Institute of Astrophysics, Bangalore, 1988)
    In this tutorial talk, the ground-based, inexpensive method of interplanetary scintillation (IPS) is described, starting with a general background of scattering of e.m. radiation in turbulent media. This is followed by the ...
  • Particle emission from Sun 
    Vahia, M. N (Indian Institute of Astrophysics, Bangalore, 1988)
    Recent results on various aspects of solar energetic particles are reviewed. A possible grain component of the polar particles is discussed in brief. The plasma component namely the solar wind and the solar energetic ...
  • Heating of the Solar Corona 
    Krishan, V (Indian Institute of Astrophysics, Bangalore, 1988)
    The maintenance of the million degree solar corona continues to be a challenging and an inspiring problem. There are basically two different mechanisms of heating depending upon the dominance or otherwise of the magnetic ...
  • Diagnostics of solar plasma using emission lines 
    Dwivedi, B. N (Indian Institute of Astrophysics, Bangalore, 1988)
    The spectroscopic techniques in the X- and EUV region to determine electron density and temperature of solar plasma have been presented. The line intensity ratios as a diagnostic probe of solar plasma from berrylium, boron, ...
  • Optical emission from solar corona 
    Raju, P. K (Indian Institute of Astrophysics, Bangalore, 1988)
    In this article the methods to probe the solar corona are briefly described. The discussion is confined to continuum and the "optical" wavelength region ~ 0.3 mum to 1.1 mum.
  • Structure of the Solar Corona 
    Krishan, V (Indian Institute of Astrophysics, Bangalore, 1988)
    Solar eclipses established the existence of the outer region of the solar atmosphere, the solar corona, extending to several solar-radii and exhibiting open and closed magnetic field patterns. The density and the temperature ...
  • Solar magnetic field and rotation 
    Gokhale, M. H (Indian Institute of Astrophysics, Bangalore, 1988)
    Sun’s highly inhomogeneous asymmetrical, and time dependent magnetic field plays a vital role in the non-Radiative energy transport that maintains the inhomogeneous asymmetrical and time dependent atmosphere of the sun ...
  • Solar activity 
    Gokhale, M. H (Indian Institute of Astrophysics, Bangalore, 1988)
    Sun could have had a nice and perfect spherical symmetry in its atmosphere and probably no variations on time scales smaller than hundreds of thousands of years if (i) the energy produced in its core could be transported ...
  • Solar Supergranulation and two-dimensional Hydrodynamic Turbulence 
    Krishan, V (Indian Institute of Astrophysics, Bangalore, 1988)
    In a two-dimensional incompressible fluid, the total energy as well as the total squared vorticity called enstrophy is conserved. It is found that the energy spectrum in two-dimensional hydrodynamic turbulence cascades to ...
  • Solar and Stellar Convection 
    Narasimha, D (Indian Institute of Astrophysics, Bangalore, 1988)
    The flow field in stellar convection zones, characterised by high Rayleigh number, low Prandtl number and large Reynolds number, is time dependent and turbulent, consisting of eddies having a range of scale-lengths upto ...
  • Solar Neutrino Puzzle 
    Sarma, K. V. L (Indian Institute of Astrophysics, Bangalore, 1988)

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