Browsing by Title

Sort by: Order: Results:

  • Heating of the quiet solar chromosphere. 1: Role of the inner network bright points 
    Kariyappa, R; Sivaraman, K. R; Anandaram, M. N (Springer, 1994-05)
    We have analyzed a large number of Ca II H line profiles at the sites of the bright points in the interior of the network using a 35-min-long time sequence of spectra obtained at the Vacuum Tower Telescope (VTT) of the ...
  • Heating of the solar and stellar coronae 
    Narain, U (Astronomical Society of India, 1998)
    The problem of heating of the solar and stellar coronae by acoustic, magnetoacoustic and Alfven waves and by magnetic energy dissipation has been reviewed. Some miscellaneous mechanisms such as mass accretion, magnetic ...
  • Heating of the Solar Corona 
    Krishan, V (Indian Institute of Astrophysics, Bangalore, 1988)
    The maintenance of the million degree solar corona continues to be a challenging and an inspiring problem. There are basically two different mechanisms of heating depending upon the dominance or otherwise of the magnetic ...
  • Height gradient of F region vertical drift in the evening equatorial ionosphere 
    Sastri, J. H; Varma, V. K. M; Nayar, S. R. P (American Geophysical Union, 1995-10)
    Simultaneous measurements of F-region vertical drift are made in the evening hours (1700-2100 IST) at Trivandrum (dip 0.6°N) and Kodaikanal (dip 4°N) on fifteen days during December 1993- January 1994 using the HF phase ...
  • Helicity Constrained Model of a Galactic Dynamo 
    Avijeet Prasad (Indian Institute of Astrophysics, 2010-06)
    Magnetic fields correlated on kiloparsec scales are seen in disc galaxies. The origin could be due to amplification of small scale seed fields by a turbulent dynamo. Helicity conservation imposes constraints on dynamo ...
  • Heliophysical processes 
    Gopalswamy, N (editor); Hasan, S. S (editor); Ambastha, A (editor) (Springer-Verlag, 2010)
    An outgrowth of the first Asia-Pacific Regional School on the International Heliophysical Year (IHY), this volume contains a collection of review articles describing the universal physical processes in the heliospace ...
  • Helioseismic constraints on the proton-proton reaction cross-section 
    Antia, H. M; Chitre, S. M (Astronomical Society of India, 2000)
  • Helioseismic detections of overshoot below the solar convection zone 
    Basu, S; Antia, H. M; Narasimha, D (Astronomical Society of India, 1993)
    It is generally accepted that there is no adequate theory to describe astrophysical convection. In particular, there is no agreement among different theories about the extent of overshoot from stellar convection zones. The ...
  • Helioseismic diagnosis of the equation of state 
    Dappen, W (Astronomical Society of India, 1996)
    The helioseismic verification of major nonideal effects in the equation of state of solar matter has become well established. The dominant contribution is the Coulomb pressure, conventionally described in the Debye-Huckel ...
  • Helioseismic inferences from the GONG data 
    Antia, H. M (Astronomical Society of India, 1998)
    To accurately measured frequencies of solar oscillations provide a powerful tool to study the solar interior in sufficient detail to test theories of stellar structure and evolution. A primary inversion of these frequencies ...
  • Helioseismic inversion to infer the depth profile of solar meridional flow using spherical born kernels 
    Mandal, K; Hanasoge, S. M; Rajaguru, S. P; Antia, H. M (IOP Publishing, 2018-08)
    Accurate inferences of solar meridional flow are crucial for understanding solar dynamo processes. Wave travel times, as measured on the surface, will change if the waves encounter perturbations, e.g., in the sound speed ...
  • Helioseismic measurements of elemental abundances in the sun's interior 
    Kosovichev, A. G (Astronomical Society of India, 1996)
    The method of 'secondary' helioseismic inversion, in which the equations of state and the thermal balance are used in addition to the hydrostatic equations, have been applied to determine the helium abundance in the Sun's ...
  • Helioseismology 
    Antia, H. M (Indian Institute of Astrophysics, Bangalore, 1988)
    Many of the oscillations observed at the solar surface have been identified with resonant normal modes of the entire solar body. Accurate measurements of frequencies of these modes enable us to study the internal structure ...
  • Helioseismology - Impact and Implications 
    Hasan, S. S (Astronomical Society of India, 1995-09)
  • Helioseismology and solar neutrinos 
    Chitre, S. M (Astronomical Society of India, 2000)
  • Helium absorption in the Sun 
    Evershed, John (Taylor and Francis, 1908-05)
  • Helium abundance in the solar envelope 
    Basu, S (Astronomical Society of India, 2000)
  • Helium Enhancement in the Metal-rich Red Giants of ω Centauri 
    Hema, B. P; Pandey, G; Kurucz, R. L; Prieto, C. A (IOP Publishing, 2020-07-01)
    The helium-enriched (He-enriched) metal-rich red giants of ω Centauri, discovered by Hema & Pandey using the low-resolution spectra from the Vainu Bappu Telescope, and confirmed by the analyses of the high-resolution spectra ...
  • Helmholtz Resonance Cell for Gas Phase Photoacoustic Studies 
    Ajith Prasad, K. C; Nampoori, V. P. N; Vallabhan, C. P. G (Indian Institute of Astrophysics, Bangalore, 1991)
    The design and frabication of a Helmholtz type gas phase photoacoustic cell are described. The cell which incorporates a miniature microphone (Knowles B.T.1759) along with a matching pre-amplifier is very sensitive and can ...
  • Hemispheric asymmetry of sunspot area in solar cycle 23 and rising phase of solar cycle 24: comparison of three data sets 
    Ravindra, B; Javaraiah, J (2015-08)
    Analysis of long-term solar data from different observatories is required to compare and confirm the various level of solar activity in depth. In this paper, we study the north–south asymmetry of monthly mean sunspot area ...

Search DSpace

Browse

My Account