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Browsing IIAP Publications by Title

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  • The Evershed effect as we understand it today 
    Rajaguru, S. P (Indian Academy of Sciences, 2009-11)
    Following a description of the Evershed effect as observed by John Evershed in 1909 at the Kodaikanal Solar Observatory, we discuss the evolution of our scientific understanding that accompanied the development of the ...
  • Evershed flow velocities during 100 years 
    Hiremath, K. M (Springer, 2010)
    An extensive literature survey indicates that the peak velocities of the Evershed flows in sunspots at the photospheric level are independent of the strength of the solar activity cycle. This result is discussed in the ...
  • Evershed velocities in bipolar sunspots 
    Sundararaman, K; Aleem, P. S. M; Thiagarajan, R (Astronomical Society of India, 1999)
    Spectra taken at the solar telescope-spectrograph, Kodaikanal, are analysed to find the sight-line velocity values in the regions between the opposite polarity sunspots. Velocities in opposite directions in the range 1 - ...
  • Evidence for Low-power Radio Jet–ISM Interaction at 10 pc in the Dwarf AGN Host NGC 4395 
    Nandi, Payel; Stalin, C. S; Saikia, D. J; Riffel, Rogemar A; Manna, Arijit; Pal, Sabyasachi; Dors, O. L; Wylezalek, Dominika; Paliya, Vaidehi S; Saikia, Payaswini; Dabhade, Pratik; Patig, Markus-Kissler; Sagar, R (American Astronomical Society, 2023-12-20)
    Black-hole-driven outflows in galaxies hosting active galactic nuclei (AGN) may interact with their interstellar medium (ISM) affecting star formation (SF). Such feedback processes, reminiscent of those seen in ...
  • Evidence for OI 630.0 nm dayglow variations over low latitudes during onset of a substorm 
    Chakrabarty, D; Sekar, R; Sastri, J. H; Pathan, B. M; Reeves, G. D; Yumoto, K; Kikuchi, T (American Geophysical Union, 2010-10)
    Observations of OI 630.0 nm dayglow intensity from Mt. Abu (magnetic latitude (MLAT): 16.2°N; magnetic longitude (MLONG): 148°E) at two different directions corresponding to two different magnetic latitudes (MLATZenith: ...
  • Evidence for return meridional flows in the convection zone 
    Sivaraman, K. R; Sivaraman, H; Gupta, S. S; Howard, R. F (Springer, 2010)
    We report velocities of meridional motions derived from the latitude drifts of spot groups measured on photographic images of the Sun in the Kodaikanal observatory archives. They serve to measure different meridional flows ...
  • Evidence for the quantum birth of our Universe 
    Unnikrishnan, C. S; Gillies, G. T; Ritter, R. C (Indian Academy of Sciences, 2002-08)
    We present evidence for a nonsingular origin of the Universe with initial conditions determined by quantum physics and relativistic gravity. In particular, we establish that the present temperature of the microwave background ...
  • Evidence for wave harmonics in cool loops 
    O'Shea, E; Srivastava, A. K; Doyle, J. G; Banerjee, D (Astronomy and Astrophysics, Vol. 473, pp. L13 - L16, 2007-10)
    Aims.Using temporal series image data from the Coronal Diagnostic Spectrometer (CDS) on SOHO, we study oscillations found in intensity (radiance) measurements from the transition region O V 629 line with the aim of finding ...
  • Evidence of a Counterrotating Core in the Large Magellanic Cloud 
    Subramaniam, A; Prabhu, T. P (The American Astronomical Society, 2005-05)
    Stellar radial velocity data in the central region of the Large Magellanic Cloud (LMC) are used to estimate its radial velocity curve along various position angles (P.A.'s), including the line of nodes (LON). The central ...
  • Evidence of a Misaligned Secondary Bar in the Large Magellanic Cloud 
    Subramaniam, A (The American Astronomical Society, 2004-03-20)
    Evidence of a misaligned secondary bar, within the primary bar of the Large Magellanic Cloud (LMC), is presented. The density distribution and the dereddened mean magnitudes ( ) of the red clump stars in the bar obtained ...
  • Evidence of expansion in the central region of NGC 2346 
    Banerjee, D. P. K; Anandarao, B. G; Desai, J. N; Jain, S. K; Mallik, D. C. V (International Astronomical Union, 1989)
  • Evidence of high-mass star formation through multiscale mass accretion in hub-filament-system clouds 
    Liu, Hong-Li; Tej, Anandmayee; Liu, Tie; Sanhueza, Patricio; Qin, Sheng-Li; He, Jinhua; Goldsmith, Paul F; Garay, Guido; Pan, Sirong; Morii, Kaho; Li, Shanghuo; Stutz, Amelia; Tatematsu, Ken’ichi; Xu, Feng-Wei; Bronfman, Leonardo; Saha, Anindya; Issac, Namitha; Baug, Tapas; Toth, L Viktor; Dewangan, Lokesh; Wang, Ke; Zhou, Jianwen; Lee, Chang Won; Yang, Dongting; Luo, Anxu; Shen, Xianjin; Zhang, Yong; Wu, Yue-Fang; Ren, Zhiyuan; Liu, Xun-Chuan; Archana Soam; Zhang, Siju; Luo, Qiu-Yi (Oxford University Press on behalf of Royal Astronomical Society, 2023-07)
    We present a statisticalstudy of a sample of 17 hub-filament-system (HFS) clouds of high-massstar formation using high-angular resolution (∼1–2 arcsec) ALMA 1.3 and 3 mm continuum data. The sample includes eight infrared ...
  • Evidence of Plasma Resonance Instability from Observations of Solar Decimetric Fine Structures 
    Fernandes, F. C. R; Sawant, H. S; Cecatto, J. R; Krishan, V; Karlicky, M; Rosa, R. R (Sociedade Brasileira de Física, 2003-03)
    The solar radio emissions in the decimetric frequency range (above 1000 MHz) are very rich in temporal and/or spectral fine structures. The Brazilian Solar Spectroscope (BSS) at INPE started operating in 1998. Since then, ...
  • Evidence of underdeveloped torus and broad-line region of weak emission line quasars based on their spectral energy distribution 
    Kumar, Ritish; Chand, Hum; Joshi, Ravi (Oxford University Press on behalf of Royal Astronomical Society, 2023-03)
    To unravel the dominant cause of the weak emission line in a subset of optically selected radio-quiet 'weak emission line quasars' (WLQs), we have investigated the possibility of an underdeveloped broad line region (BLR). ...
  • Evidence of V-band polarimetric separation of carbon stars at high galactic latitude 
    Goswami, A; Sreeja, S. K; Sen, A. K (IOP Publishing, 2010-10-10)
    Polarization is an important indicator of stellar evolution, especially for stars evolving from red giant stage to planetary nebulae. However, not much is known about the polarimetric properties of the carbon-enhanced ...
  • Evolution of a Peculiar Type Ibn Supernova SN 2019wep 
    Gangopadhyay, A; Misra, Kuntal; Hosseinzadeh, Griffin; Arcavi, Iair; Pellegrino, Craig; Wang, Xiaofeng; Andrew Howell, D; Burke, Jamison; Zhang, Jujia; Kawabata, Koji; Singh, Mridweeka; Dastidar, Raya; Hiramatsu, Daichi; McCully, Curtis; Mo, Jun; Chen, Zhihao; Xiang, Danfeng (American Astronomical Society, 2022-05-10)
    We present a high-cadence short term photometric and spectroscopic monitoring campaign of a type Ibn SN 2019wep, which is one of the rare SN Ibn after SNe 2010al and 2019uo to display signatures of flash ionization (He ii, ...
  • The evolution of bulges of galaxies in minor fly-by interactions 
    Kumar, A; Mousumi Das; Kataria, Sandeep Kumar (Cambridge University Press, 2019-06)
    We investigate the minor interactions of two disk galaxies with mass ratio of 10:1 in fly-by encounters that do not lead to the merging of the galaxies. In our N-body simulations, we vary only the pericenter distances to ...
  • Evolution of coronal helicity in a twisted emerging active region 
    Ravindra, B; Longcope, D. W (Springer, 2010)
    Active-region magnetic fields are believed to be generated near the shear layer of the convection zone by dynamo processes. These magnetic fields are concentrated into fluxtubes, which rise, due to buoyancy, through the ...
  • Evolution of Currents of Opposite Signs in the Flare-productive Solar Active Region NOAA 10930 
    Ravindra, B; Venkatakrishnan, P; Tiwari, S. K; Bhattacharyya, R (IOP Publishing, 2011-10-10)
    Analysis of a time series of high spatial resolution vector magnetograms of the active region NOAA 10930 available from the Solar Optical Telescope SpectroPolarimeter on board Hinode revealed that there is a mixture of ...
  • Evolution of emission line activity in intermediate mass young stars 
    Manoj, P; Bhatt, H. C; Maheswar, G; Muneer, S (American Astronomical Society, 2006-12-10)
    We present optical spectra of 45 intermediate-mass Herbig Ae/Be stars. Together with the multiepoch spectroscopic and photometric data compiled for a large sample of these stars and ages estimated for individual stars by ...

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