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Browsing IIAP Publications by Author "Bhatnagar, A"

Browsing IIAP Publications by Author "Bhatnagar, A"

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  • The Evershed Effect and Line Asymmetry in Sunspot Penumbrae 
    Bhatnagar, A (Kodaikanal Observatory, 1966-11)
  • Observations of October 24, 1995 total solar eclipse from ground and from Canberra Aircraft at 40,000 ft. altitude 
    Bhatnagar, A; Nijhavan, A. K; Sehgal, N. K; Kamble, V. B; Pandya, R. P; Pandya, N. P; Bhavsar, K. M; Prajapati, R. P (Indian Institute of Astrophysics, 1997)
    Photographic observations were made of the total solar eclipse from the ground (near Agra-village Jajau) and from a height of 40,000 feet on board a Canberra aircraft of the Indian Air Force. For this purpose two identical ...
  • On the Polar Coronal Rays of the Sun 
    Bhatnagar, A; Raheem, K. C. A (Kodaikanal Observatory, 1970-10)
    A study of the polar coronal rays made on two eclipse photographs is presented. From the frequency distribution of polar rays, it is shown that the maximum distribution of polar rays occurs in an annular zone arround ...
  • Optical Aspects of Solar Activity 
    Bhatnagar, A (Indian Institute of Astrophysics, Bangalore, 1986)
    A review of optical observations of some solar phenomena is presented. From the photospheric observations of the birth, growth and decay of pores, spots and sunspot groups and associated velocity and magnetic field structure ...
  • Optical observations of the Sun 
    Bhatnagar, A (Indian Institute of Astrophysics, Bangalore, 1988)
  • Photoelectric and Spectrographic Studies of Nova Delphini (1967) 
    Doss, A. T; Bhatnagar, A; Natarajan, V (Kodaikanal Observatory, 1972-07)
    The measurement and analysis of the spectra of Nova Delphini (1967) obtained at Kodaikanal is presented. An estimate of the photospheric temperature of the nuclear star of the nova is also made
  • The Solar Corona of July 20, 1963 
    Bappu, M. K. V; Bhatnagar, A (Kodaikanal Observatory, 1969-01)
    The total solar eclipse of July 20, 1963 was observed at the AAVSO site near Wilton, Malne, U.S.A, where totality lasted for 58 seconds. Pictures of the corona were obtained with a camera of focal length 57 cm on Kodak ...
  • A study of some optical phenomena associated with solar flares 
    Bhatnagar, A; Punetha, L. M (Government Observatory, Madras, 1962-10)
  • Total solar eclipse observations MiG-25 at 80,000 ft 
    Bhatnagar, A; Mukerji, S; Babu, Y. S; Sehgal, N. K; Kamble, V. B; Pandya, R. P; Pandya, N. P; Bhavsar, K. M; Prajapati, R. P (Indian Institute of Astrophysics, 1997)
    The objective of this project was to take intensity and polarization measurements of extended solar coronal streamers, from a height of 75,000 to 80,000 feet above the ground. Hitherto, no observations have been made of ...
  • Variation in continuum brightness and equivalent widths of lines in sunspot penumbrae 
    Bhatnagar, A (Springer - Verlag, 1966)
    Variations in the continuum brightness and in the equivalent widths of lines have been observed in the sunspot penumbral spectra. Darker regions in the continuum of the penumbrae show widening of lines, while the brighter ...
  • Variations in Oscillation Frequencies From Minimum to Maximum of Solar Activity 
    Jain, K; Bhatnagar, A (Springer, 2003-04)
    The temporal variation in intermediate-degree-mode frequencies is analysed using helioseismic data which cover the minimum to the maximum phase of the current solar cycle. To study the variation in detail, the measured ...

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