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Browsing by Author "Pande, M. C."

Browsing by Author "Pande, M. C."

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  • (A-X) system of SiO in sunspots 
    Joshi, G. C.; Punetha, L. M.; Pande, M. C. (1979)
    The calculated equivalents widths of some lines of SiO in the umbral spectrum suggest that strong lines of Si²⁸ O¹⁶ , Si²⁹ O¹⁶ , and Si³⁰ O¹⁶, may be present in the sunspot ultraviolet spectrum. We also find that between ...
  • Association of coronal holes with large scale solar magnetic fields 
    Shelke, R. N.; Pande, M. C. (1984)
    Association of coronal holes with large scale solar magnetic fields has been investigated. It is concluded that coronal holes always form in the large unipolar magnetic field patterns, and no specific polarity rule holds ...
  • Association of solar flares with twisting of magnetic neutral lines 
    Uddin, W.; Pande, M. C.; Shelke, R. N. (1986)
    Assuming that the flares tend to occur in highly sheared magnetic fields which also lead to a twisting of magnetic neutral line in complex active regions, we have defined a ‘twisting index’. The correlation of this twisting ...
  • Ballik-ramsey band in solar spectrum 
    Pande, M. C.; Sinha, K. (1974)
    Equivalent width calculations for a line 1.83 μ of the 0-0 vibrational band of the Ballik-Ramesy band system has been carried out in two photospheric models- BCA and HSRA. Centre to limb variation of the above line is given ...
  • Behaviour of some neutral molecular absorption lines in facula models 
    Tripathi, B. M.; Sinha, K.; Pande, M. C. (1982)
    The equivalent widths of some selected absorption lines of C₂, CH, MgH, NH, OH and SH molecules in five facula and two photospheric models have been calculated under the assumption of LTE. The calculations reveal that the ...
  • Coronal holes and long-lived unipolar magnetic regions 
    Shelke, R. N.; Pande, M. C. (1984)
    Association of coronal holes with long-lived unipolar magnetic regions (LLUMRs) which survived for four solar rotations is examined. It is noticed that every coronal hole fits in well within the LLUMR. The coronal holes ...
  • C₂ in eta aquilae spectrum 
    Bondal, K. R.; Joshi, G. C.; Pande, M. C. (1973)
    The equivalent width of R₁ (16) line of the 0-0 band of the Swan system of C₂ calculated for the minimum phase of light variation in η Aql comes out to be 27 mÅ. Thus, if Dawe’s model atmosphere and the assumed abundance ...
  • 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 ...
  • Detection of new short period oscillations in PG 1711+336 (V795 HER) 
    Ashoka, B. N.; Seetha, S.; Marar, T. M. K.; Padmini, V. N.; Kasturirangan, K.; Rao, U. R.; Pande, M. C.; Mahra, H. S. (1989)
    Long period light variations of the cataclysmic variables PG 1711+336 (V795 Her) were first noticed by Mironov et al. (1983 a,b) who reported a photometric period of 0.115883 day for the system. Baidak et al., (1985) ...
  • Differential rotation of coronal holes 
    Shelke, R. N.; Pande, M. C. (1985)
    Using KPNO helium 10830Å synoptic charts of Carrington rotation 1716 through 1739, and by assembling a time sequence representing single latitude zone, rotational properties of coronal holes for five zones of latitudes ...
  • Diffusion of CO and CH molecules in the solar atmosphere 
    Sinha, K.; Pande, M. C. (1973)
    The calculated rates of photodissoication, radiative association and the diffusion of CH and CO molecules show that the diffusion rates are many orders of magnitude smaller than the photodissociation and radiative association ...
  • 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 ...
  • The distribution of sunspots over the sun 
    Uddin, W.; Pande, M. C.; Verma, V. K. (1991)
    The distribution of the sunspots for the period 1967-1987 (solar cycles 20 and 21) is presented here. We find that the ± 11-20° latitude belt is most prolific for the occurrence of various spot types irrespective of ...
  • Double ribbon flare of 1981 october 19 
    Verma, V. K.; Pande, M. C. (1983)
    Photographic observations with a 0.7 Å passband H-alpha Hale filter and morphological description of the double ribbon flare which occurred near Halle plage region 17926 on 1981 October 19 are described. Initially the ...
  • Energetic flare zones on the Sun 
    Verma, V. K.; Pande, M. C.; Uddin, W. (1987)
    In this investigation, we have studied the latitudinal, longitudinal (northern and southern hemispheric) distributions based on 1737 major flared observed during solar cycles 19 and 20 (see subsequent paragraphs) and have ...
  • 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 ...
  • Equivalent widths of molecular lines in eta aquilae 
    Pande, M. C.; Joshi, G. C.; Bondal, K. R. (1974)
    Using dawe's model atmospheres the equivalent widths of R1 line belonging to the 0-0 band of the electronic transition B2∑+ →X2∑+ of the CN molecule were calculated for various phases of light variation in ŋAql. the ...
  • 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. ...
  • Formation of C₂ molecules in solar atmosphere 
    Sihna, K.; Pande, M. C. (1974)
    It is shown that while the triplet states of Swan bands are populated through an LTE path, the singlet states of Phillilps bands are not. The problems regarding the observations of t he various bands of C₂ molecules in the ...
  • Franck-Condon factors for some abundant umbral molecules 
    Joshi, G. C.; Joshi, U. C.; Punetha, L. M.; Pande, M. C. (1982)
    Some of molecular transitions in UV in sunspots are pointed out and Franck-Condon factors for some of these have been calculated.

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