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Browsing by Author "Gaur, V. P."

Browsing by Author "Gaur, V. P."

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  • Centre to limb variation of rotational temperature of the CH molecules in the solar photosphere 
    Pandey, M. C.; Gaur, V. P.; Bondal, K. R.; Dubey, R. C. (1980)
    Spectrophotoelectric observations of the CH lines have been presented to determine the centre-to-limb behaviour of rotational temperatures for the (0-0)and (1-1) bands of the electronic transition A²∆-X²II of the molecule. ...
  • Dependence of molecular dissociation equilibrium on magnetic field strength in sunspots 
    Gaur, V. P.; Pande, M. C.; Tripathi, B. M.; Joshi, G. C. (1971)
    It is shown that the total number of CO, CN, C₂, UH, NH and CH molecules varies significantly with magnetic field strength in sunspots. The equivalent widths of two first overtone lines of CO belonging to 0-2 vibration-rotation ...
  • The dissociation equilibrium of some diatomic molecules in Delta Cephei 
    Pande, M. C.; Tripathi, B. M.; Murthy, C. S.; Gaur, V. P. (1971)
    The dissociation equilibrium of CO, CN, C₂, CH, NH and OH is considered for the maximum and minimum phases of the light curve of δ Cep. Concentration-optical depth curves show that with both the phases the abundances ...
  • Equilibrium constants of the molecular ion H₃⁺ 
    Gaur, V. P.; Pande, M. C.; Chandra, S. (1992)
    The H₃⁺ molecular ion plays an important role int he chemistry of astronomical objects as it protonates the neutral species. The authors have recently calculated the partition functions of H₃⁺ which may be used to compute ...
  • Evolution of the helical prominence of December 15, 1992 
    Uddin, W.; Gaur, V. P.; Pande, M. C. (1995)
    Following Vrsnak (1990), the observations of an eruptive prominence are analysed. Time evolution of height and velocity of the ascending prominence are measured. The prominence manifested helical structure and many knots. ...
  • Ionised molecules in BCA photospheric model 
    Pande, M. C.; Gaur, V. P. (1972)
    The dissociation equilibrium of ionized diatomic molecular species CO⁺, N O⁺, OH⁺, O₂⁺, N₂⁺, H₂⁺ in BCA photospheric model is considered. The abundances of these species are in the order H₂⁺, CO⁺, OH⁺, NO⁺, O₂⁺ and N₂⁺. ...
  • Ionized Molecules in facula models 
    Tripathi, B. M.; Gaur, V. P.; Pande, M. C. (1981)
    Equivalent widths for the lines of ionized molecules A1H⁺, CH⁺, CN⁺, CO⁺, MgH⁺, N2⁺, NH⁺, OH⁺ and SiH⁺ have been calculated in five facular and two photospheric models. The calculations suggest that CH⁺ should show up in ...
  • Molecular abundances in sunspots 
    Gaur, V. P.; Pande, M. C.; Tripathi, B. M. (1973)
    The results of the dissociation equilibrium calculations for Zwaan’s sunspot model are given. It appears that many di-and tri-atomic molecules form in sufficient abundances in the spots. It is suggested that for assessing ...
  • Molecular line haze opacity in sunspots 
    Gaur, V. P.; Pande, M. C.; Sah, M. (1979)
    It has been shaown that bound-bound opacity due to electronic transitions of molecules CN, CaH, MgH and TiO explains, in first approximation, the line haze opacity postulated by Zwaan (1974) for the region 0.5 µm to 0.9 ...
  • Molecules in the Solar Photosphere 
    Pande, M. C.; Gaur, V. P.; Tripathi, B. M. (2015-08-19)
    A consideration of the dissociation equilibrium of diatomic molecules in the Utrecht Reference Photosphere leads us to conclude that SH, SiO, CS, HF and HCl may show up in enough concentrations in the solar atmosphere. The ...
  • Molecules in eta aquilae 
    Pande, M. C.; Joshi, G. C.; Tripathi, B. M.; Gaur, V. P. (1971)
    The total numbers Iφ(AB) of a given molecule AB in a column extending between τ=0 to τ=3.00 have been calculated for various phases ɸ of light variations in η Aql for the molecules CO, CN, C ₂ , OH, NH and CH. It is found ...
  • Molecules in white dwarfs 
    Gaur, V. P.; Tripathi, B. M.; Joshi, G. C.; Pande, M. C. (1988)
    Molecular dissociation equilibrium calculations were done for the model atmospheres of DA and non-DA white dwarfs. Our calculations show that He₂⁺ and HeH⁺ appears as most abundant molecules in the atmospheres of non-DA ...
  • Nitric oxide in sunspots 
    Gaur, V. P. (1974)
    The calculated equivalent width of R₁ (26.5) line of the 0-1 vibration-rotation band of NO near 5.3 μm for the sunspot model of Stellmacher and Wiehr (1970) suggests the likelihood of the presence of this band in sunspot ...
  • A note on the effect of scattered light on the facula-to-photosphere contrast 
    Pande, M. C.; Tripathi, B. M.; Gaur, V. P. (1971)
    The measured facula-to-photosphere contrast in the continuum radiation corrected for the scattered light should yield a hotter average facula model than the models derived without such a correction.
  • Observations of total solar eclipse of February 16, 1980 
    Gaur, V. P.; Bondal, K. R.; Sinha, K.; Joshi, G. C.; Pande, M. C. (1980)
    We have successfully photographed flash spectrum sequence just before and just after the totality. About 25 frames on each occurrence of flash were registered.
  • On some visible and infrared atomic hydrogen lines in three photospheric models 
    Bondal, K. R.; Gaur, V. P. (1986)
    The behavior of the line profiles in the wings of the first four lines of the Balmer, Paschen and Brackett series in the solar spectrum at the disc centre has been investigated with a view to comparing the computed profiles ...
  • On the behaviour of some visible and infrared atomic hydrogen lines in facular models 
    Bondal, K. R.; Gaur, V. P.; Pande, M. C. (1986)
    The behaviour of line profiles in the wings of the Balmer, Paschen, and Brackett lines (alpha to delta) has been theoretically investigated in five facular models at disc centre. These profiles have been compared amongst ...
  • On the centre-to-limb variation of some visible and infrared atomic hydrogen lines in three facular models 
    Bondal, K. R.; Gaur, V. P. (1987)
    The centre-to-limb behaviour of the residual intensities in the line wings of Balmer, Paschen, and Brackett series lines (alpha to delta) in three facular models at four wing points has been investigated with a view to ...
  • On the solar limb darkening in the wings of some atomic hydrogen lines 
    Bondal, K. R.; Gaur, V. P.; Pande, M. C. (1987)
    The centre-to-limb behaviour of the first four lines of the Balmer, Paschen, and Brackett series of atomic hydrogen at selected distances from the line centre, i.e. at Δλ = 5, 10, 20, and 30 Å has been theoretically ...
  • On the unusual surge of 1991 November 16 
    Bondal, K. R.; Gaur, V. P.; Uddin, W.; Pande, M. C. (1994)
    An unusually 'long' surge of 'short' duration occurred in the NW region of the sun's limb on 1991 November 16, around 04 15 UT. Time-lapse photographic observations employing a Halle Hpalpha filter having a 0.5/0.7 Å ...

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