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Browsing Publications of Astronomical Society of India by Author "Uddin, W"

Browsing Publications of Astronomical Society of India by Author "Uddin, W"

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  • Analysis of solar flare in CaII K on 1989 March 13 
    Joshi, A; Uddin, W (Astronomical Society of India, 1991)
    We report the CaII K observations of a major umbral solar flare of optical class 3B which occurred on 1989 March 13. Correlated optical, microwave, soft X-ray (SXR), sudden ionospheric disturbance observations and the ...
  • Association of solar flares with twisting of magnetic neutral lines 
    Uddin, W; Pande, M. C; Shelke, R. N (Astronomical Society of Indian, 1986-06)
    A 'twisting index' is defined, assuming that flares tend to occur in highly sheared magnetic fields which also lead to a twisting of magnetic neutral lines in complex active regions. The correlation of this twisting index ...
  • Atmospheric extinction at Devasthal, Naini Tal 
    Mohan, V; Uddin, W; Sagar, R; Gupta, S. K (Astronomical Society of India, 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 ...
  • CCD observations of eruptive prominence of March 19, 1994 
    Uddin, W; Gaur, V. P; Pande, M. C (Astronomical Society of India, 1998)
    The observations of a limb prominence (N 26; E 90) were carried out with the help of a Peltier cooled CCD system. In the beginning the prominence was observed as quiescent prominence with compact helical structure. Rise, ...
  • CCD observations of eruptive prominence of March 19, 1994 
    Uddin, W; Gaur, V. P; Pande, M. C (Astronomical Society of India, 1998)
  • Dynamical properties of flare Loops of 27 November 1996 
    Uddin, W; Lalan, P (Astronomical Society of India, 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 Flare and Associated Primary and Secondary Post Flare Loops 
    Uddin, W; Joshi, B; Chandra, R; Joshi, A (Astronomical Society of India, 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 ...
  • Eruption of a large quiescent prominence on January 14, 1993 
    Uddin, W; Bondal, K. R (Astronomical Society of India, 1996)
  • Eruption of twisted filament, associated flare and transient phenomena 
    Uddin, W; Verma, V. K (Astronomical Society of India, 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 ...
  • Evolution of the helical prominence of December 15, 1992 
    Uddin, W; Gaur, V. P; Pande, M. C (Astronomical Society of India, 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. ...
  • On the unusual surge of 1991 November 16 
    Bondal, K. R; Gaur, V. P; Joshi, A; Uddin, W; Pande, M. C (Astronomical Society of India, 1994)
    An unusually 'long' surge of 'short' duration occurred in the NW region of the sun's limb on 1991 November 16, around 04 15 UT. Time-lapse photographic observations employing a Halle H-alpha filter having a 0.5/0.7 A ...
  • Proposed 60-cm multichannel Solar Vacuum Telescope of UPSO, Naini Tal 
    Verma, V. K; Uddin, W; Gaur, V. P (Astronomical Society of India, 1998)
  • 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 (Astronomical Society of India, 2001)
    Results of the seeing measurements carried out near Devasthal top on 43 nights during March to April 1999 are presented. Open air seeing measurements were carried out with a differential image motion monitor (DIMM) using ...
  • Short Note - a Solar Flare Event in CAII K on 1989 March 9 
    Uddin, W; Joshi, A (Astronomical Society of Indian, 1989-12)
  • Site characterization for the UPSO-TIFR telescope 
    Sagar, R; Uddin, W; Pandey, A. K; Stalin, C. S; Mohan, V; Sanwal, B. B; Gupta, S. K; Yadav, R. K. S; Durgapal, A. K; Joshi, S; Kumar, B; Gupta, A. C; Joshi, Y; Srivastava, J. B; Chaubey, U. S; Singh, M; Pant, P; Gupta, K. G; Padalia, T. D (Astronomical Society of India, 2000)
    The Uttar Pradesh State Observatory, Naini Tal and Tata Institute of Fundamental Research, Mumbai plan to install jointly a 3 metre size optical telescope at Devasthal located east of Naini Tal about 50 km by road. The ...
  • Solar observational programs and facilities at UPSO, Naini Tal 
    Gaur, V. P; Verma, V. K; Uddin, W (Astronomical Socity of India, 1998)
    We present here the overview of the solar facilities at the U.P. State Observatory, Naini Tal, which have been developed over years for the observations of solar activity phenomena. The various backend instruments and the ...
  • Surge activities on November 26-28, 1990 
    Uddin, W; Verma, V. K (Astronomical Society of India, 2000)
    We report here a study of 8 solar surges observed in H? emission on the west solar limb (active region NOAA 6368) on 26, 27 and 28 November 1990. Three surges were observed on 26 November of durations 35, 86 and 40 min at ...
  • Total solar eclipse observations of 24 October 1995 from Meja Khas, Allahabad 
    Verma, V. K; Uddin, W; Gaur, V. P; Joshi, G. C; Bondal, K. R; Pant, P (Astronomical Society of India, 1996)
    Monochromatic coronal images during the total solar eclipse of 24 October 1995 were successfully obtained in 6374 Amstrong [Fe X]line. The experiment carried out a Meja Khas, Allahabad during the eclipse and the preliminary ...

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