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Browsing by Author "Uddin, W."

Browsing by Author "Uddin, W."

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  • 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 ...
  • 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 ...
  • 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 ...
  • Atmospheric extinction at Devasthal, Naini Tal 
    Mohan, V.; Uddin, W.; Sagar, R.; Gupta, S. K. (1999)
    The atmospheric extinction coefficients in Johnson U, B, V, R and I photometric passbands are determined for the first time at Devasthal, Naini Tal during 1998 and 1999. A solid state stellar photometer mounted on a 52-cm ...
  • Brightness changes in P/Halley 
    Goraya, P. S.; Srivastava, R. K.; Uddin, W. (1988)
    Thirty photometric magnitudes, in each filter (UBV), of P/Halley (1982i) have been measured on 1986, January 12. They show short-term variability of about 0.15 magnitude. The present measurements show the active nature of ...
  • Co-spatial evolution of photospheric Doppler enhancements and Hα flare ribbons observed during the solar flare of 2003 October 28 
    Venkatakrishnan, P.; Kumar, B.; Uddin, W. (2008)
    The active region NOAA (National Oceanic and Atmospheric Administration) AR 10486 which appeared on the solar disc in 2003 October produced a lot of space weather related activity. Here, we report on the co-spatial ...
  • 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 ...
  • 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 ...
  • Dynamical properties of flare Loops of 27 November 1996 
    Uddin, W.; Prasad, L. (2001)
    We observed a post-flare loop system in Hα on the west limb on 27 November 1996 which started earlier than 05:07:20 UT in NOAA active region 7997 (N04, W89). The post-flare loops were associated with long duration x-ray ...
  • Dynamics of limb flar and associated primary and secondary post flare loops 
    Uddin, W.; Joshi, B.; Chandra, R.; Joshi, A. (2003)
    In this paper we present the analysis of M 1.8 class (GOES SXR) limb flare and associated post flare loops of 2 May, 2001 which erupted on the west limb in NOAA 9433 (N15, W88). The flare started at around 00:32 UT from a ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Eruption of twisted filament, associated flare and transient phenomena 
    Uddin, W.; Verma, V. K. (1998)
    In this paper we present CCD observations between 14th to 20th Feb. 1994 and analysis of the giant twisted filament evolved in the active region NOAA 7671. The dynamic eruption of the filament accompanied by major flare ...
  • Evidence of solar flare triggering due to loop-loop interaction caused by footpoint shear motion 
    Kumar, P.; Srivastava, A. K.; Somov, B. V.; Manoharan, P. K.; Erdelyi, R.; Uddin, W. (2010)
    We analyze multi-wavelength data of an M7.9/1N class solar flare which occurred on 2006 April 27 in AR NOAA 10875. GOES soft X-ray images provide the most likely signature of two interacting loops and their reconnection, ...
  • Evidence of solar flare triggering due to loop-loop interaction caused by footpoint shear motion 
    Kumar, P.; Srivastava, A. K.; Somov, B. V.; Manoharan, P. K.; Erdelyi, R.; Uddin, W. (2010-11-10)
    We analyze multi-wavelength data of an M7.9/1N class solar flare which occurred on 2006 April 27 in AR NOAA 10875. GOES soft X-ray images provide the most likely signature of two interacting loops and their reconnection, ...
  • Evolution of solar magnetic field and associated multiwavelength phenomena: flares events on 2003 November 20 
    Kumar, P.; Manoharan, P. K.; Uddin, W. (2010)
    We analyze Hα images, soft X-ray profiles, magnetograms, extreme ultra-violet images and, radio observations of two homologous flare events (M1.4/1N and M9.6/2B) on 2003 November 20 in the active region NOAA 10501 and ...
  • 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. ...
  • 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 ...
  • 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), ...

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