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Browsing Publications of Astronomical Society of India by Author "Bhatnagar, A"

Browsing Publications of Astronomical Society of India by Author "Bhatnagar, A"

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  • GONG p-mode frequency changes with solar activity 
    Bhatnagar, A; Jain, K; Tripathy, S. C (Astronomical Society of India, 2000)
    In this paper, we present a correlation study of nine solar activity indices with p-mode frequency shifts obtained from the GONG data. It is found that the two are closely correlated and a linear relationship exits. Further, ...
  • 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 ...
  • International collaboration - Global Oscillation Network Group (GONG) 
    Bhatnagar, A (Astronomical Society of India, 1998)
    Global Oscillation Network Group (GONG) is a community based International programme to study the solar interior through the use of the technique of heliseismology. The GONG programme was initiated at the National Solar ...
  • Observations of Coronal Velocity Field, Flash Spectrum and Shadow Bands During Total Solar Eclipse 1980 
    Bhatnagar, A; Jadhav, D. B; Jain, R. M; Shelke, R. N; Purohit, S. P (Astronomical Society of India, 1980-12)
    Observations using a multislit spectrograph at 5303A Fe XIV line were obtained during the 16 February, 1980 total solar eclipse, for velocity field determination in the solar coronal. A colour movie film of the flash ...
  • Recurrent mass ejection associated with flare behind the limb on 1978 December 20 
    Jain, Rajmal; Bhatnagar, A; Shelke, R. N (Astronomical Society of India, 1984-06)
    An interesting solar flare occured on 1978 December 20 behind the north-west limb, in the McMath active region no. 15700, as inferred from the observed associated energtic mass ejections, strong x-rays, decimetric and ...
  • A relation between frequency shift and the changes in activity indices 
    Jain, K; Tripathy, S. C; Kumar, B; Bhatnagar, A (Astronomical Society of India, 2000)
    We present a linear relation between the shift in p-mode frequencies and variation in two solar activity indices, namely the sunspot number and 10.7 cm radio flux. From this relation, an empirical model is constructed to ...
  • Solar rotation rate from minimum to maximum of activity cycle 
    Jain, K; Tripathy, S. C; Bhatnagar, A; Kumar, B (Astronomical Society of India, 2001)
    Using helioseismic data from SOI/MDI and GONG for the current solar cycle 23, from solar minimum to near maximum phase, we report here on the temporal variation of the rotation rate.
  • Temporal variations of solar p-mode frequencies on time scales of 27 days 
    Tripathy, S. C; Jain, K; Bhatnagar, A (Astronomical Society of India, 2002-09)
    We have studied variations in the frequencies of intermediate degree solar oscillation modes on a time cadence of 18 and 27 days. We report that the p-modes adjust to changes in the activity measures on time scales as ...
  • U-shaped type II solar radio bursts associated with 1980 March 28 flare 
    Markeev, A. K; Formichev, V. V; Chertok, I. M; Bhatnagar, A; Jian, R. M; Shelke, R. N; Bhonsle, R. V (Astronomical Society of India, 1983-12)
    The observations of the 1980 March 28, 2B flare in optical, radio microwave and metric and x-ray wavelengths are presented. In the dynamic radio spectrum, unusual and rare U-shaped type II radio bursts associated with this ...
  • A viewpoint on moderate size solar telescope 
    Bhatnagar, A (Astronomical Society of India, 1998)

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