Research Papers: Recent submissions

  • Extremely energetic 4B/X17.2 flare and associated phenomena 
    Uddin, W.; Chandra, R.; Ali, S. S. (2006)
    We observed 4B/X17.2 flare in Hα from super-active region NOAA 10486 at ARIES, Nainital. This is one of the largest flares of current solar cycle 23, which occurred near the Sun’s center and produced extremely energetic ...
  • Research facilities for solar astronomy at ARIES 
    Pant, P. (2006)
    The solar observational facilities at ARIES (erstwhile U.P. State Observatory, UPSO), Nainital, began in the sixties with the acquisition of two moderate sized (25 cm, f/66 off-axis Skew Cassegrain and 15 cm, f/15 ...
  • Multi-wavelength afterglow observations of the high redshift GRB 050730 
    Pandey, S. B., ...et al. (including Sharma, S.) (2006)
    GRB 050730 is a long duration high-redshift burst (z = 3.967) that was discovered by Swift. The afterglow shows variability and was well monitored over a wide wavelength range. We present comprehensive temporal and spectral ...
  • Study of a large helical eruptive prominence associated with double CME on 21 April 2001 
    Ali, S. S.; Uddin, W.; Chandra, R. (2006)
    Here we present a preliminary analysis of a helical eruptive prominence at the east limb of the Sun on 21 April 2001. Unusually this eruption is associated with a double CME. We have tried to study the morphology of ...
  • The population in the background of open clusters: tracer of the Norma-Cygnus arm 
    Pandey, A. K.; Sharma, S.; Ogura, K. (2006)
    We present colour–magnitude diagrams of open clusters, located in the range 112˚< l< 252˚ , manifesting stellar populations in the background of clusters. Some of the populations are found to be located beyond the ...
  • Energetics and dynamics of an impulsive flare on March 10, 2001 
    Chandra, R.; Jain, R.; Uddin, W.; Yoshimura, K.; Kosugi, T.; Sakao, T.; Joshi, A.; Deshpande, M. R. (2006)
    We present Hα observations from ARIES (Nainital) of a compact and impulsive solar flare that occurred on March 10, 2001 and which was associated with a CME. We have also analyzed HXT, SXT/Yohkoh observations as well ...
  • Optical observations of GRB 060124 afterglow: a case for an injection break 
    Misra, K.; Bhattacharya, D.; Sahu, D. K.; Sagar, R.; Anupama, G. C.; Castro-Tirado, A. J.; Guziy, S. S.; Bhatt, B. C. (2007)
    We present broad band optical afterglow observations of a long duration GRB 060124 using the 1.04-m Sampurnanand Telescope at ARIES, Nainital and the 2.01-m HCT at IAO, Hanle, including the earliest ground-based observations ...
  • Multi-wavelength analysis of an X2.7 flare on 3 November 2003 from active region NOAA 10488 
    Joshi, B.; Manoharan, P. K.; Veronig, A. M.; Pant, P.; Pandey, K. (2006)
    The evolution of an X2.7 solar flare, that occurred in a complex βγδ-type active region on 2003 November 3, is discussed utilizing multi-wavelength data set. The Hα images taken from solar tower telescope at ARIES, ...
  • Analysis of 3B/X2 Class Flare on November 24, 2000 and Associated Phenomena 
    Chandra, R.; Uddin, W. (2006)
    In this paper we present the analysis of a dynamic 3B/X2 solar flare from superactive region NOAA 9236 and its associated phenomena. The Hα observations of this flare have been carried out with Solar Tower Telescope at ...
  • On the use of simultaneous measurements of OH and O₂ emissions to investigate wave growth and dissipation 
    Taori, A.; Guharay, A.; Taylor, M. J. (2007-03-29)
    Simultaneous measurements of mesospheric OH (6–2) Meinel and O₂(0–1) Atmospheric band emis- sions from a low-latitude station, Maui, Hawaii (20.8 ̊ N, 156.2 ̊ W) are utilized to study the wave characteristics and ...
  • Environmental monitoring network for India 
    Sundareshwar, P. V., ...et al. (including Naja, M.) (2007-04-13)
    An integrated monitoring system is proposed for India that will monitor terrestrial, coastal, and oceanic environments.
  • Quasi-periodic oscillations in XTE J0111.2-7317: Highest frequency among the HMXB pulsars 
    Kaur, R.; Paul, B.; Raichur, H.; Sagar, R. (2007-05-10)
    We report the discovery of quasi-periodic oscillations (QPOs) in the high-mass X-ray binary (HMXB) pulsar XTE J0111.2-7317 during a transient outburst of the source in 1998 December. Using observations made with the ...
  • The molecular envelope around the red supergiant VY CMa 
    Muller, S.; Dinh-V-Trung; Lim, J.; Hirano, N.; Muthu, C.; Kwok, S. (2007-02-20)
    We present millimeter interferometric observations of the molecular envelope around the red supergiant VY Cma with the Submillimeter Array (SMA). The high angular resolution (<2”) allows us to derive the structure of the ...
  • Companion event and precursor of the X17 flare on 28 October 2003 
    Mandrini, C. H.; Demoulin, P.; Schmieder, B.; Deluca, E. E.; Pariat, E.; Uddin, W. (2006-11-09)
    A major two-ribbon X17 flare occurred on 28 October 2003, starting at 11:01 UT in active region NOAA 10486. This flare was accompanied by the eruption of a filament and by one of the fastest halo coronal mass ejections ...
  • Near-infrared JH photometry of young open cluster Be 59 
    Sharam, S.; Ogura, K.; Pandey, A. K.; Ojha, D. K.; Bhatt, B. C. (2007)
    We present near-infrared JH photometry and optical slitless spectroscopy of stars in the field of the young cluster Be 59. The J/(J − H) colour-magnitude diagram of the cluster yields a distance modulus of (m − M )0 = ...
  • Age sequence in small clusters associated with bright-rimmed clouds 
    Ogura, K.; Chauhan, N.; Pandey, A. K.; Bhatt, B. C.; Ojha, D.; Itoh, Y. (2007-02-25)
    Bright-rimmed clouds (BRCs) found in H II regions are probable sites of triggered star formation due to compression by ionization/shock fronts, and it is hypothesized that star formation proceeds from the exciting star(s) ...
  • Multiwavelength studies of five chromospherically active stars 
    Pandey, J. C.; Singh, K. P.; Sagar, R.; Drake, S. A. (2007)
    We present a multiwavelength study of five chromospherically active stars, including newly obtained optical photometry, low-resolution optical spectroscopy, as well as archival X-ray observations. The bulk of the ...
  • North–South asymmetry of solar activity during Cycle 23 
    Joshi, B.; Pant, P.; Manoharan, P. K.; Pandey, K. (2007)
    In this paper, we have made a statistical analysis of solar Hα flares that occurred during the period 1996 to 2005 to investigate their spatial distribution with respect to northern and southern hemispheres of the Sun. The ...
  • Results from a spectroscopic survey in the CoRoT fields 
    Medhi, B. J.; Messina, S.; Parihar, P. S.; Pagano, I.; Muneer, S.; Duorah, K. (2007)
    In this paper we report the results of the spectroscopic survey we carried out to detect chromospheric activity of late-type stars in the fields of view of the CoRoT space mission. We give an accurate MK classification of ...
  • Broad-band optical polarimetric study of IC 1805 
    Medhi, B. J; Maheswar, G.; Brijesh, K.; Pandey, J. C.; Kumar, T. S.; Sagar, R. (2007)
    We present the BVR broad-band polarimetric observations of 51 stars belonging to the young open cluster IC 1805. Along with the photometric data from the literature, we have modelled and subtracted the foreground dust ...

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