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Browsing by Author "Ambastha, A"

Browsing by Author "Ambastha, A"

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  • Dynamical properties of quiescent prominence in He D3 5876 Angstrom line emission 
    Prasad, C. D; Ambastha, A; Mathew, S. K (Astronomical Society of India, 1999)
    We have observed a quiescent prominence with the Coude spectrograph of Udaipur Solar Observatory during May 24-25, 1995. Analysis of two dimenstional spectroscopic data was carried out in order to obtain the line shifts ...
  • Excitation of Solar p-mode Oscillations by Flares 
    Ambastha, A; Basu, S; Antia, H. M (Astronomical Society of India, 2003)
    Solar flares release large amounts of energy at different layers of the solar atmosphere. It is, therefore, expected that major flares would be able to excite waves, thereby affecting the p-mode oscillation characteristics. ...
  • GONG site evaluation program at Udaipur Solar Observatory 
    Ambastha, A; Bhatnagar, A; Jain, R; Srivastava, N; Gupta, S; Sharma, R; Agrawal, G (Astronomical Society of India, 1991)
    The Global Oscillations Network Group (GONG) project to study the internal structure and dynamic of the sun is discussed. The GONG project will measure waves that penetrate throughout the sun's core. Power spectra of the ...
  • Magnetic field gradient and flare: study of a small flare in NOAA 8038 
    Mathew, S. K; Ambastha, A (Springer, 2000-11)
    Active region NOAA 8038 was observed from 10 to 13 May, 1997 using the USO solar video magnetograph. During this period, the active region was mostly inactive, and gave rise to only a single notable flare of 1N/C1.3 class ...
  • Performance Evaluation of Adaptive Optics Systems 
    Sridharan, R; Raja Bayanna, A; Srivastava, N; Kumar, B; Ravindra, B; Gupta, S. K; Jain, N; Ambastha, A; Venkatakrishnan, P (Astronomical Society of India, 2003)
    Adaptive Optics (AO) systems improve the resolution of ground based telescopes and allow for long exposure images. Their performance depends on the seeing conditions at the time of observations. In this paper, we evaluate ...
  • 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 ...
  • White Light and Emission Line Polarization of Solar Corona during TSE of June 21, 2001 
    Ambastha, A; Gosain, S (Astronomical Society of India, 2003)
    Coronal intensity and polarization maps have been obtained for the total solar eclipse (TSE) o o of June 21, 2001, observed from Lusaka, Zambia (location: 28 17.5E 15 24.5S, Alt. 1300 mtr) at broadband H 6563Å (FWHM 80Å), ...

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