Browsing by Author "Uddin, W."

Flux emergence, flux imbalance, magnetic free energy and solar flares

Choudhary, D. P., et al.; Uddin, W.; Srivastava, A. K.; Joshi, N. C.; Kashyap, P. (Elsevier, 2013)

Emergence of complex magnetic flux in the solar active regions lead to several observational effects such as a change in sunspot area and flux embalance in photospheric magnetograms. The flux emergence also results in ...

Formation of a rotating jet during the filament eruption on 2013 April 10-11

Filippov, B; Srivastava, A. K.; Dwivedi, B. N.; Masson, S.; Aulanier, G.; Joshi, N. C.; Uddin, W. (Wiley, 2015-07)

We analyse multiwavelength and multiviewpoint observations of a helically twisted plasma jet formed during a confined filament eruption on 2013 April 10–11. Given a rather largescale event with its high spatial and ...

Great bursts of fire

Uddin, W.; Gopalswamy, N. (2013)

A coronal mass ejection (CME) is a massive burst of solar wind and magnetic fields rising above the solar corona or being released into space. Coronal mass ejections are often associated with other forms of solar activity, ...

Height of shock formation in the solar corona inferred from observations of type II radio bursts and coronal mass ejections

Gopalswamy, N. et. al.; Uddin, W.; Srivastava, A. K.; Joshi, N. C. (2013)

Employing coronagraphic and EUV observations close to the solar surface made by the Solar Terrestrial Relations Observatory (STEREO) mission, we determined the heliocentric distance of coronal mass ejections (CMEs) at the ...

Helical eruptive prominence associated with a pair of overlapping CMEs on 21 April 2001

Ali, S. S.; Uddin, W.; Chandra, R.; Mary, D. L.; Vršnak, B. (2007)

The eruption of limb prominence on 21 April 2001 associated with two coronal mass ejections (CMEs) is investigated. Hα images reveal two large-scale eruptions (a promi- nence body and a southern foot-point arch), both ...

Homologous flares and magnetic field topology in active region NOAA 10501 on 20 November 2003

Chandra, R.; Schmieder, B.; Mandrini, C. H.; Demoulin, P.; Pariat, E.; Torok, T.; Uddin, W. (2011)

We present and interpret observations of two morphologically homologous flares that occurred in active region (AR) NOAA 10501 on 20 November 2003. Both flares displayed four homologous Hα ribbons and were both accompanied ...

Homologous flare–CME events and their metric type II radio burst association

Yashiro, S. et. al.; Uddin, W. (Committee on Space Research (COSPAR), 2014)

Active region NOAA 11158 produced many flares during its disk passage. At least two of these flares can be considered as homologous: the C6.6 flare at 06:51 UT and C9.4 flare at 12:41 UT on February 14, 2011. Both flares ...

How can a negative magnetic helicity active region generate a positive helicity magnetic cloud?

Chandra, R.; Pariat, E.; Schmieder, B.; Mandrini, C. H.; Uddin, W. (2010)

The geoeffective magnetic cloud (MC) of 20 November 2003 was associated with the 18 November 2003 solar active events in previous studies. In some of these, it was estimated that the magnetic helicity carried by the MC ...

Hα, EUV and UV analysis of an eruptive 3B/X1.2 flare

Pande, S.; Pande, B.; Uddin, W.; Pandey, K. (2008-12)

The present paper presents observational results of an extremely energetic eruptive flare 3B/X1.2 from superactive region NOAA 10486. The observations were taken on 26 October 2003 with 15 cm Solar Tower Telescope at ...

Ionospheric response to the space weather event of 18 November 2003 - an investigation

Pankaj, P.; Uddin, W.; Taori, A.; Chandra, R.; Bisht, S. (2010)

The present study explores the ionospheric effects of the well cited solar flare events (M3.2, M3.9/2N) of 18 November 2003 associated with CMEs. The Hα observations of these flares (taken with 15 cm Solar Tower Telescope ...

Major surge activity of super-active region NOAA 10484

Uddin, W.; Kumar, P.; Srivastava, A. K.; Chandra, R. (2010)

We observed two surges in Hα from the super-active region NOAA 10484. The first surge was associated with an SF/C4.3 class flare. The second one was a major surge associated with a SF/C3.9 flare. This surge was also ...

Multi-wavelength observations of an unusual impulsive flare associated with CME

Uddin, W.; Jain, R.; Yoshimura, K.; Chandra, R.; Sakao, T.; Kosugi, T.; Joshi, A.; Despande, M. R. (2004)

We present the results of a detailed analysis of multi-wavelength observations of a very impulsive solar flare 1B/M6.7, which occurred on 10 March, 2001 in NOAA AR 9368 (N27 W42). The observations show that the flare is ...

Multi-wavelength view of flare events on 20 November 2003

Kumar, P; Manoharan, P. K.; Uddin, W. (2010)

We analyze two flare events that occurred in active region NOAA 501 on 20 November 2003. The Hα and magnetogram measurements show interaction between two filaments, which produced a slowly rising flare event, corresponding to ...

Multiwavelength diagnostics of the precursor and main phases of an M1.8 flare on 2011 April 22

Awasthi, A. K., et al.; Uddin, W. (Wiley, 2014-01-21)

We study the temporal, spatial and spectral evolution of the M1.8 flare, which occurred in the active region 11195 (S17E31) on 2011 April 22, and explore the underlying physical processes during the precursor phase and ...

A multiwavelength study of eruptive events on January 23, 2012 associated with a major solar energetic particle event

Joshi, N. C.; Uddin, W.; Srivastava, A. K.; Kayshap, P. (Science Direct, 2013-07-01)

We use multiwavelength data from space and ground based instruments to study the solar flares and coronal mass ejections (CMEs) on January 23, 2012 that were responsible for one of the largest solar energetic particle (SEP) ...

Multiwavelength study of the M8.9/3B solar flare from AR NOAA 10960

Kumar, P.; Srivastava, A. K.; Fillippov, B.; Uddin, W. (2010)

We present a multiwavelength analysis of a long-duration, white-light solar flare (M8.9/3B) event that occurred on 04 June 2007 from AR NOAA 10960. The flare was observed by several spaceborne instruments, namely SOHO/MDI, ...

Observation of Kink Instability as Driver of Recurrent Flares in AR 10960

Srivastava, A. K.; Kumar, Pankaj; Zaqarashvili, T. V.; Filippov, B. P.; Uddin, W. (Adv. Geo., 2011)

We study the active region NOAA 10960, which produces two flare events (B5.0, M8.9) on 04 June 2007. We find the observational signature of right handed helical twists in the loop system associated with this active region. ...

Observation of multiple sausage oscillations in cool post-flare loop

Srivastava, A. K.; Zaqarashvili, T. V.; Uddin, W.; Dwivedi, B. N.; Kumar, P. (2008)

Using simultaneous high spatial (1.3 arcsec) and temporal (5 and 10 s) resolution Hα observations from the 15 cm Solar Tower Telescope at Aryabhatta Research Institute of Observational Sciences (ARIES), we study the ...

Observations of multiple surges associated with magnetic activities in AR 10484 on 2003 October 25

Uddin, W.; Schmieder, B.; Chandra, R.; Srivastava, A. K.; Kumar, P.; Bisht, S. (2012)

We present a multi-wavelength study of recurrent surges observed in Hα, UV (Solar and Heliospheric Observatory (SOHO)/EIT), and Radio (Learmonth, Australia) from the super-active region NOAA 10484 on 2003 October 25. Several ...

Observations of total solar eclipse of 29 March 2006 and related atmospheric measurements

Uddin, W.; Joshi, B.; Kumar, T. S.; Sharma, S.; Sagar, R. (2007-10-10)

We report preliminary results on short-period oscillations in the corona and changes in the earth's atmospheric parameters, observed during a total solar eclipse of 29 March 2006 from Manavgat, Turkey

Browsing by Author "Uddin, W."

Browsing by Author "Uddin, W."

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