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Browsing IIAP Publications by Title

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  • 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 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 ...
  • Coronal Rotation from XBPs Observed with Hinode/XRT 
    Kariyappa, R; DeLuca, E (Astronomical Society of the Pacific, 2012-05)
    We have selected a large number of X-ray bright points (XBPs) over synoptic soft X-ray full-disk images observed using Al-Mesh with X-Ray Telescope (XRT) onboard the Hinode spacecraft during July-December, 2008. We have ...
  • Coronal type II bursts and interplanetary type II bursts: Distinct shock drivers 
    Suryanarayana, G. S (Elsevier B.V., 2012-02)
    We study solar radio type II bursts combining with Wind/WAVES type II bursts and coronal mass ejections (CMEs). The aim of the present work is to investigate the effectiveness of shocks to cause type II bursts in the solar ...
  • The CoRoT target HD175726: an active star with weak solar-like oscillations 
    Mosser, B; Michel, E; Appourchaux, T; Barban, C; Baudin, F; Boumier, P; Bruntt, H; Catala, C; Deheuvels, S; Garcia, R. A; Gaulme, P; Regulo, C; Roxburgh, I; Samadi, R; Verner, G; Auvergne, M; Baglin, A; Ballot, J; Benomar, O; Mathur, S (EDP Sciences, 2009-10)
    Context. The CoRoT short runs give us the opportunity to observe a large variety of late-type stars through their solar-like oscillations. We report observations of the star HD175726 that lasted for 27 days during the first ...
  • Correlated X-ray timing and spectral behavior in GX 349+2 
    Agrawal, V. K; Bhattacharyya, S (The European Southern Observatory, 2003-01)
    We present a detailed and systematic investigation of correlated spectral and timing properties of the Z source GX 349+2, using extensive data ( ~ 221 ks) obtained from the Proportional-Counter-Array on-board RXTE satellite, ...
  • Correlation between decay rate and amplitude of solar cycles as revealed from observations and dynamo theory 
    Hazra, G; Karak, B. B; Banerjee, D; Choudhuri, A. R (Springer, 2015-06)
    Using different proxies of solar activity, we have studied the following features of the solar cycle: i) The linear correlation between the amplitude of cycle and its decay rate, ii) the linear correlation between the ...
  • A correlation between ellipticity and core-strength in extended radio galaxies 
    Prabhu, T. P; Kochhar, R. K (D. Reidel Publishing Co., 1984-07)
    The authors show that in the case of extended radio sources a correlation exists between the fraction of the radio flux retained in the core component and the ellipticity of the underlying galaxy. The correlation is in the ...
  • Correlation between magnetic shear and magnetic tension in a solar active region 
    Venkatakrishnan, P; Narayanan, R. S; Prasad, N. D. N (Kluwer Academic Publishers, 1993-04)
    The difference between the magnetic tension and magnetic shear was calculated for four vector magnetograms of NOAA AR 4474. It was seen that this difference between the two independent angular measures of magnetic stress ...
  • Correlation between optical and γ -ray flux variations in bright flat spectrum radio quasars 
    Rajput, Bhoomika; Stalin, C. S; Sahayanathan, S (Oxford University Press on behalf of the Royal Astronomical Society, 2020-11)
    Blazars are known to show flux variations over a range of energies from low-energy radio to high-energy γ-rays. Cross-correlation analysis of the optical and γ-ray light curves in blazars shows that flux variations are ...
  • Correlation between optical and γ-ray flux variations in BL Lacs 
    Rajput, Bhoomika; Shah, Zahir; Stalin, C. S; Sahayanathan, S; Rakshit, S (Oxford University Press on behalf of the Royal Astronomical Society, 2021-06)
    We report here results of the analysis of correlated flux variations between the optical and GeV γ-ray bands in three bright BL Lac objects, namely AO 0235+164, OJ 287, and PKS 2155−304. This was based on the analysis of ...

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