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Browsing by Author "Vasantharaju, N"

Browsing by Author "Vasantharaju, N"

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  • Eruption of the EUV Hot Channel from the Solar Limb and Associated Moving Type IV Radio Burst 
    Vemareddy, P; Demoulin, P; Sasikumar Raja, K; Zhang, J; Gopalswamy, N; Vasantharaju, N (American Astronomical Society, 2022-03-01)
    Using the observations from the Solar Dynamics Observatory, we study an eruption of a hot-channel flux rope (FR) near the solar limb on 2015 February 9. The pre-eruptive structure is visible mainly in EUV 131 Å images, ...
  • Fine image motion controler for Kodaikanal tunnel telescope 
    Thulasidharen, K. C; Prabhu, K; Rangarajan, K. E; Vasantharaju, N; Prabhu Ramkumar, B (Indian Institute of Astrophysics, 2013-05-06)
    Automation of the spectropolarimetric observations at Kodaikanal tunnel telescope needs placement of the Sun's image on the spectrograph slit and scanning it across the region of interest. This requirement can be achieved ...
  • Formation and eruption of sigmoidal satructure from a weak field region of NOAA 11942 
    Vasantharaju, N; Vemareddy, P; Ravindra, B; Doddamani, V. H (IOP Publishing, 2019-04-01)
    Using observations from the Solar Dynamics Observatory, we studied an interesting example of a sigmoid formation and eruption from small-scale flux-canceling regions of active region (AR) 11942. Through an analysis of ...
  • Magnetic Imprints of Eruptive and Noneruptive Solar Flares as Observed by Solar Dynamics Observatory 
    Vasantharaju, N; Vemareddy, P; Ravindra, B; Doddamani, V. H (American Astronomical Society, 2022-03-01)
    The abrupt and permanent changes of the photospheric magnetic field in the localized regions of active regions during solar flares, called magnetic imprints (MIs), have been observed for nearly the past three decades. The ...
  • Solar dynamics imaging system a back-end instrument for the proposed NLST 
    Ramesh, K. B; Vasantharaju, N; Hemanth, P; Reardon, K (Springer, 2016-12)
    The Solar Dynamics Imaging System (SDIS) will be one of the focal plane instruments operated at the National Large Solar Telescope (NLST). The prime objective of the instrument is to obtain high spatial and temporal ...
  • Solar G-band observations at Merak, Leh/Ladakh 
    Vasantharaju, N; Dorjey, N; Ravindra, B; Prabhu, K; Rangarajan, K. E; Prabhu Ramkumar, B; Sankarasubramanian, K (Indian Institute of Astrophysics, 2012)
    G-band observations are important for the study of dynamics of magnetic features in the solar photosphere and they are carried out using large telescopes, larger than 30 cm. We installed a 40 cm DFM telescope at one of ...
  • Statistical Study of Magnetic Nonpotential Measures in Confined and Eruptive Flares 
    Vasantharaju, N; Vemareddy, P; Ravindra, B; Doddamani, V. H (IOP Publishing, 2018-06-10)
    Using Solar Dynamics Observatory/Helioseismic and Magnetic Imager vector magnetic field observations, we studied the relation between the degree of magnetic non-potentiality with the observed flare/coronal mass ejection ...
  • Temporal offsets among solar activity indicators 
    Ramesh, K. B; Vasantharaju, N (Springer, 2014-04)
    Temporal offsets between the time series of solar activity indicators provide important clues regarding the physical processes responsible for the cyclic variability in the solar atmosphere. Hysteresis patterns generated ...

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