Research Papers: Recent submissions

  • CN and C₂ in Hyakutake (C/1996 B2) 
    Rautela, B. S.; Joshi, G. C.; Srivastava, J. B. (1998)
    CN (∆v=0) and C₂ (∆v = +1,0, -1) emission fluxes at 388.3, 469.5, 516.5 and 553.8 nm respectively and continuum fluxes at 484.0 nm have been analysed to get the production rates of molecular species CN and C₂ and dust in ...
  • Analysis of the 9th November 1990 flare 
    Joshi, A.; Uddin, W. (2000)
    In this paper we present complete two-dimensional measurements of the observed brightness of the 9th November 1990 Hα flares, using a PDS microdensitometer scanner and image processing software MIDAS. The resulting isophotal ...
  • Periodic variation of the North-South asymmetry of solar activity phenomena 
    Verma, V. K. (2000)
    We report here a study of various solar activity phenomena occurring in both north and south hemispheres of the Sun during solar cycles 8-23. In the study we have used sunspot data for the period 1832-1976, flare index ...
  • CCD photometry of the Markarian galaxy Mrk 1043 
    Joshi, S. C.; Rautela, B. S.; Joshi, G. C.; Srivastava, J. B. (1998)
    CCD photometric observations of Mrk 1043 have been obtained in BVRI filters. The integrated magnitude and colours of the galaxy have been estimated. The B-V colour of the Mrk 1043 is much bluer than the average colour of ...
  • Prolonged intranight optical quiescence of the classical BL Lac object PKS 0735+178 
    Goyal, A.; Gopal-Krishna; Anupama, G. C.; Sahu, D. K.; Sagar, R.; Britzen, S.; Karazous, M.; Aller, M. F.; Aller, H. D. (2009)
    We report our extensive intranight optical monitoring of the well known low-energy peaked (LBL) BL Lac object PKS 0735+178. This long-term follow-up consists of R-band monitoring for a minimum duration of ∼ 4 hours, on 17 ...
  • Middle atmospheric thermal structure obtained from Rayleigh lidar and TIMED/SABER observations: A comparative study 
    Guharay, A.; Nath, D.; Pant, P.; Pande, B.; Russell III, J. M.; Pandey, K. (2009)
    A novel measurement of seasonal variability of the middle atmospheric thermal structure has been carried out by comparing ground-based lidar and space-based TIMED/ SABER observations from a low-latitude station, Gadanki ...
  • Retrieval of columnar aerosol size distributions from spectral attenuation measurements over Central Himalayas 
    Dumka, U. C.; Sagar, R.; Pant, P. (2009)
    Extensive measurements of spectral aerosol optical depths (AODs) were made at Manora Peak, Nainital (29.4°N, 79.5°E, ~1958 m above mean sea level) in the central Himalayas, using a ten channel multi-wavelength solar ...
  • Physics of the GRB 030328 afterglow and its environment 
    Maiorano, E., ... et al. (including Pandey, S. B.) (2006)
    To investigate the physical nature of the afterglow emission. We report on the photometric, spectroscopic and polarimetric observations of the optical afterglow of Gamma–Ray Burst (GRB) 030328 detected by HETE-2. ...
  • Wide-field CCD photometry around nine open clusters 
    Sharma, S.; Pandey, A. K.; Ogura, K.; Mito, H.; Tarusawa, K.; Sagar, R. (2006-10)
    In this paper we study the evolution of the core and corona of nine open clusters using the projected radial density profiles derived from homogeneous CCD photometric data obtained with the 105 cm Kiso Schmidt telescope. ...
  • First ground-based mesospheric measurements from central Himalayas 
    Guharay, A.; Taori, A.; Bhattacharjee, S.; Pant, P.; Pande, B.; Pandey, K. (2009)
    First ground-based mesospheric temperature measurements from a central Himalayan station of India, Nainital (29.4°N and 79.5°E) have been carried out during January 2007 with the help of OH and O₂ airglow monitoring during ...
  • Multi-wavelength observations of the GRB080319B afterglow and the modeling constraints 
    Pandey, S. B., ... et al. (2009)
    We present observations of the GRB 080319B afterglow at optical, mm, and radio frequencies between a few hours and 67 days after the burst. We attempt to understand the nature of this extraordinarily bright explosion based ...
  • A study of the old galactic star cluster Berkeley 32 
    Richtler, T.; Sagar, R. (2001)
    We present a new CCD photometry of the distant old open star cluster Berkeley 32 in Johnson V and Cousins I passbands. A total of ~3200 stars have been observed in a field of about 13'х13'. The colour-magnitude diagram ...
  • Seeing and microthermal measurements near Devasthal top 
    Stalin, C. S.; Sagar, R.; Pant, P.; Mohan, V.; Kumar, B.; Joshi, Y. C.; Yadav, R. K. S.; Joshi, S.; Chandra, R.; Durgapal, A. K.; Uddin, W. (2001)
    Results of the seening measurements carried out near Devasthal top on 43 nights during March to April 1999 are presented. Open air seeing measurements were carried out with the mirror about 2 m above the ground. This, in ...
  • Characterization of the semi-annual-oscillation in mesospheric temperatures at low-latitudes 
    Taylor, M. J.; Taori, A. K.; Hatch, D. R.; Liu, H. L.; Roble, R. G. (2005)
    Novel measurements of the seasonal variability in mesospheric temperature at low-latitudes have been obtained from Maui, Hawaii (20.8°N, 156.2°W) during a 25-month period from October 2001 to January 2004. Independent ...
  • V , I CCD photometry of metal-rich bulge globular clusters: NGC 6553 
    Sagar, R.; Subramaniam, A.; Richtler, T.; Grebel, E. K. (1999)
    We have carried out V I CCD photometry of about 40 000 stars down to V ∼ 23 mag in an area of about 6' × 10' centered on the metal-rich Galactic bulge globular cluster NGC 6553 and an adjacent field region. Our ...
  • Microthermal measurements of surface layer seeing at Devasthal site 
    Pant, P.; Stalin, C. S.; Sagar, R. (1999)
    In order to detect the microthermal fluctuations introduced by the atmospheric turbulence very near to the ground at Devasthal site, a PC based instrumenta tion has been developed. The optical image degradation due to ...
  • The Tully–fisher relations of the Eridanus group of galaxies 
    Omar, A.; Dwarakanath, K. S. (2006)
    The Tully–Fisher (TF) or the luminosity–linewidth relations of the galaxies in the Eridanus group are constructed using the HI rotation curves and the luminosities in the optical and in the near-infrared bands. The slopes ...
  • A Whole Earth Telescope campaign on the pulsating subdwarf B binary system PG 1336−018 (NY Vir) 
    Kilkenny, D., ... et al. (including Joshi, S.) (2003)
    We present results from a multisite (‘Whole Earth Telescope’) photometric campaign on PG 1336−018, the close eclipsing binary system containing a pulsating subdwarf B (sdB) star. The main part of the campaign (1999 April) ...
  • Flares from the giant ar 9433 on 24 april 2001 
    Joshi, A.; Chandra, R.; Uddin, W. (2003)
    We present Hα CCD observations of three small-to-medium-size two-ribbon flares observed in the giant AR 9433 on 24 April 2001. Flare observations at other associated wavelengths (e.g., soft X-rays (SXR), hard X-rays (HXR), ...
  • Multi-colour optical monitoring of the intra-day variable blazar S5 0716+71 
    Sagar, R.; Krishna-Gopal; Mohan, V.; Pandey, A. K.; Bhatt, B. C.; Wagner, S. J. (1999)
    We report multi-colour optical monitoring of the intra-day variable blazar S5 0716+71 with a dense temporal coverage over a total duration of 4 weeks in February/March 1994. Four filters (BV Johnson and RI Cousins) ...

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