Archival Collections: Recent submissions

  • Some Aspects of Rayleigh and Mie Scattering in the Atmosphere Over Pune 
    Devara, P. C. S; Raj, P. E (Indian Institute of Astrophysics, Bangalore, 1991)
    Computations of aerosol mixing ratio [( Na + Nm)/Nm] have been made using the aerosol number density (Na) estimated from the laser radar (lidar) observations carried out at the IITM, Pune and air molecular number density ...
  • Multipole structure of the heliomagnetic field and northsouth asymmetry in the heliospheric current sheet 
    Girish, T. E; Prabhakaran Nayar, S. R (Indian Institute of Astrophysics, Bangalore, 1988)
    North-South asymmetry in the heliospheric current sheet (HCS) defined as the difference in the maximum helioatitudinal extension of the HCS in the northern and southern heliospheres, can be classified into two different ...
  • Observations of the brightness temperature distribution of the quiet solar corona at decametric wavelengths 
    Sastry, Ch. V (Indian Institute of Astrophysics, Bangalore, 1988)
    The brightness temperature distribution of the quiet solar corona at a wavelength of 8.9 Meters is measured with two types of radio telescopes: (1) A “ T ” type array with a resolution of 26’x38’ and (2) A fan beam ...
  • Optical observations of the Sun 
    Bhatnagar, A (Indian Institute of Astrophysics, Bangalore, 1988)
  • Possibility of occurrence of solar proton flares in relation to other phenomena 
    Uddin, W; Pande, M. C; Verma, V. K (Indian Institute of Astrophysics, Bangalore, 1988)
    In the present investigation we have studied the relation between solar proton flares and associated optical, radio and x-ray events. It is found that optical flares are usually associated with large optical flares in ...
  • Diffuse echo bursts at 34.5 MHz 
    Subramanian, K. R (Indian Institute of Astrophysics, Bangalore, 1988)
    The solar radio bursts during their propagation towards the earth are refracted, scattered, reflected and absorbed. The combination of these effects play a role in determining the source size, position, brightness temperature ...
  • On the periodicity of solar great hard X-ray bursts, energic solar radio bursts and sunspot data 
    Verma, V. K; Joshi, G. C (Indian Institute of Astrophysics, Bangalore, 1988)
    In the last solar maximum period (cycle 21) the 152-158 day periodicity was found in the occurrence rate of solar flares through solar gamma ray, microwave, soft X-ray, hard X-ray and H-alpha flares. In the present, brief ...
  • Electron impact polarization of resonance lines from Li-like ions 
    Chandra, Suresh (Indian Institute of Astrophysics, Bangalore, 1988)
  • 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 ...

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