Research Papers: Recent submissions

  • A note on the rotational motion in quiescent prominences 
    Pande, M. C.; Bondal, K. R. (1994)
    Following an earlier paper (Pande & Bondal 1991) we have, on the basis of Kippenhahn and Schluter's magnetohydrostatic model of a quiscent prominence, attempted to study the effects of a rotational velocity field in the ...
  • Spectral characteristics and columnar size distribution of aerosols over Arabian Sea and tropical Indian ocean 
    Saha, A.; Moorthy, K. K. (2004)
    Size distribution is one of the most prominent properties of atmospheric aerosols. Most of the effects of aerosols can be understood only with the knowledge of its size distribution. The direct and indirect radiative effects ...
  • Study of a quiescent prominence 
    Joshi, A.; Gaur, V. P.; Pande, M. C. (1994)
    The evolution of a quiescent prominence (QP) seen on the NW solar limb from 11 to 13 June 1991 has been studied. The observations of the main-phase activity of the of the QP on 12 June 1991 are also discussed.
  • Spatial variation of aerosol optical depth over Arabian Sea: effect of long-rang transport 
    Saha, A.; Moorthy, K. K. (2004)
    The spatial variation of aerosols is strongly coupled to the location of the source regions and prevailing atmospheric circulation, which transport the aerosols far away from the source regions. Thus, the concentration and ...
  • Variability of 20 Cvn 
    Srivastava, R. K. (1992)
    The Delta-Scuti(?) variables, 20 Cvn, has been observed photoelectrically on two nights, JD 2446586 and JD 2446949, in U, B and V filters. The average amplitudes on these nights come out to be 0.13 mag and 0.08 mag with ...
  • Period study of AX Draconis 
    Srivastava, R. K. (1992)
    A new period (P = 0ᵈ. 5681643) for AX Draconis, based on all available times of minima, has been given. O-C diagrams for the star, based on various periods, have been given. A sinusoidal variation is apparent in figures, ...
  • Constancy of period in XX leonis 
    Srivastava, R. K. (1994)
    An updated period study of XX Leonisgives a revisedperiod, P = 0ᵈ.970939, and indicates constancy of the period since its earliest observation.
  • CCD photometry of galactic open star clusters – IV. NGC 366 
    Pandey, A. K.; Bhatt, B. C.; Mohan, V.; Paliwal, D. C.; Mahra, H. S. (1994)
    CCD photometry of the open cluster NGC 366 has been carried out in UBVRI photometric passbands down to 19.5 mag. It is found that the reddening is non-uniforn across the cluster field., having ∆E(B – V) = 0.30 mag. A ...
  • Spatial gradients in aerosol optical depth and columnar size characteristics over Arabian Sea and tropical Indian Ocean 
    Saha, A.; Moorthy, K. K. (2004)
    During the periods when winds ar calm over the oceans, so that local sea production is quite low, and the advection of continental aerosols by pervailing circulations persisits (like during the northeasterly winds over ...
  • Aerosol optical depths over a high altitude station- Nainital: spectral characteristics and forenoon-afternoon asymmetry 
    Dumka, U. C.; Kumar, B.; Pant, P.; Moorthy, K. K.; Sagar, R.; Saha, A. (2004)
    The temporal variations of AOD at Nainital during the study period showed significant seasonal variations with high AODs (~0.4 at 500nm) during summer and low values (≤0.08 at 500nm) during post-monsoon and winter months.
  • Determination of mixing layer height using LIDAR 
    Srivastava, M. K.; Martucci, G.; Mitev, V.; Frioud, R. M; Richner, H. (2004)
    Two lidar methods for determinatin of the MLH are compared. These methods are based respectively on the lidar signal gradient and the lidar signal variance. The two methods show excellent agreement, but with respect to the ...
  • A case study on the impact of wet removal on aerosol spectral optical depth and retrieved size distributions 
    Saha, A.; Moorthy, K. K. (2004)
    Aerosols are removed from the atmosphere by dry depositon and wet removal. Of these, wet removal is more efficient, primarily because the falling speed of the precipitation greatly exceeds the dry deposition velocity of ...
  • On the occurrence rate of high-speed solar wind events 
    Verma, V. K.; Joshi, G. C. (1994)
    We have investigated the rate of occurrence of solar wind phenomenon observed between 1972-1984 using power-spectrum analysis. The data have been taken from the high-speed solar wind (HSSW) stream catalogue published by ...
  • Asymmetries during the maximum phase of solar cycle 22 
    Joshi, A. (1994)
    This paper presents the result of studies of the asymmetries (N-S and E-W) for different manifestations of solar activity events (sunspot groups, Hα flares and active prominence/filaments) during the maximum-phase (1989-1991) ...
  • Eruption of a large quiescent prominence on January 14, 1993 
    Uddin, W.; Bondal, K. R. (1996)
    In this paper an analysis of a large quiescent prominence which erupted on January 14, 1993 is carried out. Observations of this prominence were initiated on January 12, 1993 when it made its first appearance on the east ...
  • 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. ...
  • UBV CCD standards in two galaactic directions – II 
    Mohan, V.; Sanwal, B. B.; Paliwal, D. C.; Pandey, A. K.; Bhatt, B. C.; Robin, A. C. (1996)
    Using CCD observations, photometric magnitudes have been obtained in two galactic directions at intermediate latitude. A total of 7 sub-fields in one direction (l = 3°, b = 47°) have been observed leading to photometric ...
  • Spectrometric observations of some Be stars 
    Singh, M.; Sanwal, B. B. (1996)
    Using EG and G spectrograph coupled with reticon array detector and Optical Multichannel Analyser (OMA) at the Cassegrain focus of the 104 cm telescope of the U.P. State Observatory, Naini Tal, several well known bright ...
  • Spectrophotometry of RZ Cas 
    Chaubey, U. S. (1996)
    Spectrum scans of the eclipsing binary star RZ Cas at different phases in the wavelength range λλ 3300 - 7600 Å taken through Hilger and Watts monochromator equipped with 104-cm telescope of Uttar Pradesh State Observatory, ...
  • A photometric study of the open cluster King 7 
    Durgapal, A. K.; Mohan, V.; Pandey, A. K.; Mahra, H. S. (1996)
    The UBVRI CCD photometric observations of stars in the field o King 7 have been used to study the fundamental parameters such as interstellar extinction, age distance and mass function of the cluster. To obtain these ...

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