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  • 5x21tk176?file=thumbnail
    Article
    Bhatnagar, A.
    A tunable Lithium Niobate (LiNbO3) Fabry-Perot lter (FP) (passband 165m A at 6122 A) based video magnetograph has been designed and fabricated. This instrument is capable of providing near simultaneous observations of photospheric longitudinal magneti . . .
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    Article
    Liu, Chang
    We present G-band and Ca ii H observations of NOAA AR 10930 obtained by Hinode/SOT on 2006 December 6 covering an X6.5 flare. The Local Correlation Tracking technique was applied to the foreshortening-corrected G-band image series to acquire horizonta . . .
  • Xg94hs940?file=thumbnail
    Article
    Uddin, Wahab
    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 their relation to the main phase . . .
  • C247dw73v?file=thumbnail
    Article
    Choudhary, Debi Prasad
    We have studied the source of a coronal mass ejection (CME), which occurred in a decayed active region NOAA 7978 on 19 October, 1996. The active region NOAA 7978 first appeared on the solar disk on 2 June, 1996 and made more than five disk passages be . . .
  • 6d570081q?file=thumbnail
    Article
    Choudhary, Debi Prasad
    We present a multiwavelength study of the 2005 September 13 eruption from NOAA AR 10808 that produced total four flares and two fast coronal mass ejections (CMEs) within ~1.5 hr. Our primary attention is paid to the fact that these eruptions occurred . . .
  • Rb68xg22r?file=thumbnail
    Article
    Beck, C.
    We investigate the three-dimensional (3D) thermal topology in a super-penumbral canopy of an active region (AR). We derive temperature stratifications in the AR by an inversion of the Ca ii IR line at 854.2 nm, assuming local thermal equilibrium. We f . . .
  • 1z40kx25r?file=thumbnail
    Article
    Choudhary, Debi Prasad
    We used the flux calibrated images through the Broad Band Filter Imager and Stokes Polarimeter data obtained with the Solar Optical Telescope onboard the Hinode spacecraft to study the properties of bright points in and around the sunspots. The well i . . .
  • Bn999989n?file=thumbnail
    Article
    Choudhary, Debi Prasad
    Solar activity indices vary over the Sun's disk, and various activity parameters are not considered to be symmetric between the northern and southern hemispheres of the Sun. The north-south asymmetry of different solar indices provides an important cl . . .
  • 41687m70j?file=thumbnail
    Article
    Choudhary, Debi Prasad
    The magnetic flux imbalance of active regions has been studied using the longitudinal magnetograms obtained from the National Solar Observatory at Kitt Peak. The maximum and the median value of the flux imbalance in 137 active regions situated near th . . .
  • X920g1214?file=thumbnail
    Article
    Deng, Na
    We study the evolution of the flows and horizontal proper motions in and around a decaying follower sunspot based on time sequences of two-dimensional spectroscopic observations in the visible and white-light imaging data obtained over 6 days from2005 . . .