Browsing by Title

Sort by: Order: Results:

  • Core shift effect in blazars 
    Agarwal, A; Mohan, P; Gupta, A. C; Mangalam, A; Volvach, A. E; Aller, M. F; Aller, H. D; Gu, M. F; Lahteenmaki, A; Tornikoski, M; Volvach, L. N (Oxford University Press on behalf of the Royal Astronomical Society, 2017-07)
    We studied the pc-scale core shift effect using radio light curves for three blazars, S5 0716+714, 3C 279 and BL Lacertae, which were monitored at five frequencies (ν) between 4.8 and 36.8 GHz using the University of ...
  • Core-collapse SNe of type IIP and their progenitors: The case study of PNV J01315945+3328458 
    Dastidar, R; Kumar, B; Sahu, D. K; Misra, K; Singh, M; Gangopadhyay, A; Anapuma, G. C; Pandey, S. B (Societe Royale des Sciences de Liege, 2018-04)
    The type II supernovae (SNe) are hydrogen-rich cosmic explosions resulting from the collapse of massive stars. The impetus of studying individual events arises from its cosmological importance and the diverse understanding ...
  • Coronal Electron Density and the Gradient of Coronal Rotation with Altitude 
    Vats, H. O (Astronomical Society of India, 2003)
    The calculations of the gradient of coronal rotation period with altitude were performed using electron density model and the radio measurements of solar coronal rotation. The magnitude of the gradient reduces if the ...
  • Coronal Emission Line Measurements of the February 16, 1980 Total Solar Eclipse 
    Liebenberg, D. H; Sanders, W. M; Brown, E. A; Murray, H. S; Kennedy, R. N (Tata Institute of Fundamental Research, Bombay, 1980-06)
    We have observed coronal emission line profiles at the February 16, 1980 total solar eclipse from an NC-135 aircraft. Very successful observations of a highly active corona near the peak of the 11 year solar cycle show ...
  • Coronal heating and chromospheric energy density: An observational association 
    Venkatakrishnan, P (Springer, 1993-12)
    The time-averaged equivalent width of the He 1 10830 Angstrom line is seen to be correlated with the time-averaged line width. This correlation is interpreted as evidence for the association of the chromospheric energy ...
  • Coronal heating by magnetic kink waves 
    Banerjee, D; Dikpati, M; Choudhuri, A. R (Astronomical Society of the Pacific, 1998)
    We show that the magnetic kink waves generated by the motions of the Photospheric footpoints of the coronal flux tubes can supply adequate energy for heating the quiet corona. We model the solar corona as two-layer isothermal ...
  • Coronal heating Efficiency for resonant (A.C.) and non-resonant (D.C.) mechanisms 
    Chandra, S; Musrif, P. G; Prasad, L (Astronomical Society of India, 2005-09)
    Ionson (1985a) extended his uni¯ed theory of coronal resonance heating having non-resonant (D.C.) and resonant (A.C.) components. Narain and Kumar (1995) calculated heating e±ciency for resonant and non-resonant components ...
  • Coronal Heating Experiments of the Williams College Group at Mukandgarh Fort, Rajasthan 
    Pasachoff, J. M; Babcock, B. A; Sebastian Diaz; Reardon, K. P; Kutner, E. R (Indian Institute of Astrophysics, Bangalore, 1997)
    We report on the Williams College expedition to Mukandgarh Fort, Rajasthan, for the total solar eclipse of 24 October 1995. The main experiments were a search for 1 Hz oscillations in coronal loops as an indication of ...
  • Coronal hole oscillations inferred from the SDO/AIA data 
    Hegde, M; Hiremath, K. M; Doddamani, V. H (Elsevier B.V, 2014-07-15)
    With high temporal resolution (12 sec) of about two hours duration, data of a coronal hole structure in 171°A, 193°A and 211°A taken from SDO/AIA images is considered for examination of oscillations. After estimating the ...
  • Coronal holes and long-lived unipolar magnetic regions 
    Shelke, R. N; Pande, M. C (Astronomical Society of India, 1984-12)
    Association of coronal holes with long-lived unipolar magnetic regions (LLUMRs) which survived for four solar rotations is examined. It is noticed that every coronal hole fits in well within the LLUMR. The coronal holes ...
  • Coronal Interferogram in 5303A Obtained During Total Solar Eclipse of February 16, 1980 and Coronal Temperatures 
    Chandrasekhar, T; Ashok, N. M; Desai, J. N; Vaidya, D. B; Angreji, P. D (Tata Institute of Fundamental Research, Bombay, 1980-06)
    Coronal interferogram in 5303 Armstrong was obtained during the total solar eclipse of February 16, 1980 using Fabry-Perot etalon. Coronal temperatures determined from the Doppler width of the fringes are reported and ...
  • Coronal Loops 
    Krishan, V (Indian Institute of Astrophysics, Bangalore, 1986)
    The statistical treatment of the magnetohydrodynamically turbulent plasma is used to study the steady state configuration of the coronal loops. The stability of the plasma system is defined in terms of certain invariants ...
  • Coronal magnetic field estimation using type-II radio bursts 
    Subramanian, K. R; Ebenezer, E; Raveesha, K. H (Springer, 2010)
    Coronal magnetic fields at two different heights were estimated using multiple type-II radio bursts observed on 23 January 2003. The strength of the magnetic field was estimated using 1–5 times the Newkirk density value. ...
  • Coronal magnetic field lines and electrons associated with type IIIV radio bursts in a solar flare 
    Kishore, P; Kathiravan, C; Ramesh, R; Ebenezer, E (Indian Academy of Sciences, 2017-05)
    We recently investigated some of the hitherto unreported observational characteristics of the low frequency (85–35 MHz) type III–V bursts from the Sun using radio spectropolarimeter observations. The quantitative ...
  • Coronal magnetic field measurements using forbidden emission lines 
    Megha, A; Sampoorna, M; Nagendra, K. N; Sankarasubramanian, K (Cambridge University Press, 2018-02)
    The polarization measurement of coronal forbidden emission lines is the most promising method of determining the direction of magnetic fields in the corona. A classical theory for the forbidden lines was presented in Megha ...
  • Coronal Mass Ejections and Sunspots—Solar Cycle Perspective 
    Ramesh, K. B (IOP Publishing, 2010-03-20)
    Recent studies have indicated that the occurrence of the maxima of coronal mass ejection (CME) rate and sunspot number (SSN) were nearly two years apart. We find that the two-year lag of CME rate manifests only when the ...
  • Coronal oscillations in the vicinity of a sunspot as observed by GIS/CDS 
    Lin, C. H; Banerjee, D; Doyle, J. G; O'Shea, E (European Space Agency, 2004-12)
    We present the analysis and results of GIS time series observed on 19th July 2003 at the boundary between the quiet Sun and an active region, close to a sunspot. The velocity map of NIS/CDS O v 629 Å show two pairs of red ...
  • Coronal oscillations in the vicinity of a sunspot as observed by GIS/CDS 
    Lin, C. H; Banerjee, D; Doyle, J. G; O'Shea, E; Foley, C. R (EDP Sciences, 2005-05)
    In this paper, we present results from a time series analysis of data from the Grazing Incidence Spectrometer (GIS), onboard SoHO. Our observations were concentrated at the boundary between the quiet Sun and an active ...
  • Coronal photography at H alpha 
    Rangarajan, K. E; Giridhar, S (Indian National Science Academy, 1981)
  • Coronal Proerties of the Seyfert 1 Galaxy 3C 120 with NuSTAR 
    Priyanka Rani; Stalin, C. S (IOP Publishing, 2018-04-01)
    We present a measurement of the cut-off energy, a proxy for the temperature of the corona in the nuclear continuum of the Seyfert 1 galaxy 3C 120 using ~120 ks of observation from NuSTAR. The quality broadband spectrum ...

Search DSpace

Browse

My Account