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Browsing by Author "Hiremath, K. M"

Browsing by Author "Hiremath, K. M"

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  • Observational Searches for Chromospheric g-Mode Oscillationsfrom CaII H-Line Observations 
    Kariyappa, R; Dame, L; Hiremath, K. M (Indian Academy of Sciences, 2006-09)
    We have used a high spatial and temporal resolution of long time sequence of spectra in CaII H-line obtained at the Vacuum Tower Telescope (VTT) of the Sacramento Peak Observatory on a quiet region at the center of the ...
  • On the relationship between masses of Sun like G-stars and their exoplanets 
    Gurumath, Shashanka R; Hiremath, K. M; Ramasubramanian, V (Serials Publications Pvt. Ltd., 2014-08)
    Right from dawn of the civilization, human’s quest for understanding the genesis of solar system formation remains elusive. There are many unanswered questions; to cite few: (i) How sun and solar system is formed? ...
  • Physics of the Solar Cycle: New Views 
    Hiremath, K. M (Balkan, Black Sea and Caspian Sea, 2010-11)
    Presently there are two schools of thought viz., turbulent dynamo and MHD oscillation mechanisms that explain the solar cycle and activity phenomena. Both the mechanisms are critically examined and fundamental difficulties ...
  • Prediction of solar cycle 24 and beyond 
    Hiremath, K. M (Springer Netherlands, 2008-04)
    In the previous study (Hiremath, Astron. Astrophys. 452:591, 2006a), the solar cycle is modeled as a forced and damped harmonic oscillator and from all the 22 cycles (1755–1996), long-term amplitudes, frequencies, phases ...
  • Primordial Flares, Flux Tubes, and Gamma-ray Bursts 
    Hiremath, K. M (International Astronomical Union, 2000)
    Given the prevailing physical conditions in the cosmic environment, the similarity of solar transients and cosmic gamma-ray bursts suggests that the most promising energy source for the latter may be primordial flares, ...
  • Rotation rates of coronal holes and their probable anchoring depths 
    Hiremath, K. M; Hegde, M (IOP Publishing, 2013-02-01)
    For the years 2001-2008, we use full-disk, SOHO/EIT 195 °A calibrated images to determine latitudinal and day to day variations of the rotation rates of coronal holes. We estimate the weighted average of heliographic ...
  • A seismic model of the solar convective envelope 
    Shibahashi, H; Hiremath, K. M; Takata, M (International Astronomical Union, 1998)
    We deduce the density, pressure, and temperature profiles in the solar convective envelope by solving the basic equations for mass conservation and the hydrostatic equilibrium with the imposition of the helioseismologically ...
  • Seismic solar model: both of the radiative core and the convective envelope 
    Shibahashi, H; Hiremath, K. M; Takata, M (Elsevier, 1999)
    We determine the solar internal structure by solving the basic stellar structure equations with the imposition of the sound speed, which is inferred from helioseismology. As for the radiative core, all the four structure ...
  • Seismology of the Sun: Inference of Thermal, Dynamic and Magnetic Field Structures of the Interior 
    Hiremath, K. M (Springer, 2013-08)
    Recent overwhelming evidences show that the sun strongly influences the Earth’s climate and environment. Moreover existence of life on this Earth mainly depends upon the sun’s energy. Hence, understanding of physics of the ...
  • The solar cycle as a forced and damped harmonic oscillator: long-term variations of the amplitudes, frequencies and phases 
    Hiremath, K. M (EDP Sciences, 2006-06)
    We model solar activity cycle as a forced and damped harmonic oscillator consisting of two parts, sinusoidal and transient. The amplitudes, frequencies, phases and decay factors of such a harmonic oscillator are determined ...
  • Solar forcing on the changing climate 
    Hiremath, K. M (Balkan, Black Sea and Caspian Sea, 2009-04)
    The influence of solar cycle and activity phenomena on the two climatic variabilities such as the rainfall and the surface temperature of the Indian subcontinent is critically examined. It is concluded from this study that ...
  • Solar wind associated with near equatorial coronal Hole 
    Hegde, M; Hiremath, K. M; Doddamani, V. H; Gurumath, S. R (2015-09)
    Present study probes temporal changes in the area and radiative flux of near equatorial coronal hole associated with solar wind parameters such as wind speed, density, magnetic field and temperature. Using high temporal ...
  • Steady and fluctuating parts of sun's internal magnetic field 
    Gokhale, M. H; Hiremath, K. M (International Astronomical Union, 1993-01)
    We have modeled the 'steady' part of sun's internal poloidal magnetic field in the form of a central dipole and a central hexapole with strengths (0.6 +/- 0.1)B(o)R(0) exp 3 and (0.16 +/- 0.05)B(o)R(0) exp 5 embedded in ...
  • Steady part of rotation and toroidal component of magnetic field in the solar convective envelope 
    Hiremath, K. M (Astronomical Society of India, 2001)
    With reasonable assumptions and approximations, we solve analytically the full set of Chandrasekhar's (1956) MHD equations in the convective envelope, for steady part of rotation and toroidal component of the magnetic field ...
  • Steady part of the sun's internal rotation 
    Hiremath, K. M; Gokhale, M. H (Astronomical Society of India, 1998)
    It is shown that steady part of rotation in the Sun's convective envelope (CE) and radiative core (RC)can be determined as an analytical solution of the diffusion equation in an incompressible medium of constant diffusivity. ...
  • Steady parts of rotation and magnetic field in the sun's convective envelope 
    Hiremath, K. M; Gokhale, M. H (Astronomical Society of India, 1996)
    We use the full set of Chandrasekhar's (1956) MHD equations for determining the steady parts of rotation and poloidal as well as toroidal magnetic field, in the Sun's convective envelope assuming incompressibility. The ...
  • "Steady" and "Fluctuating" Parts of the Sun's Internal Magnetic Field: Improved Model 
    Hiremath, K. M; Gokhale, M. H (The American Astronomical Society, 1995-07)
    Using reasonable assumptions and approximations it is shown that the poloidal component part of the magnetic field in the Sun's radiative core (RC) and convection zone (CE) can be modeled as in an analytical solution of ...
  • Study of Sun's "hydromagnetic" Oscillations Using Sunspot Data 
    Gokhale, M. H; Javaraiah, J; Hiremath, K. M (International Astronomical Union, 1990)
    Spherical-harmonic-fourier (SHF) analysis of sun’s ‘nominal toroidal magnetic field’, computed using sunspot data during 1874-1976, shows that sunspot activity can be considered as possibly originating in interference of ...
  • Study of Sun's Long Period Oscillations 
    Hiremath, K. M (Indian Institute of Astrophysics, Bangalore, 1994-07)
  • The thermal structure of sunspots 
    Hiremath, K. M; Akshatha, B. B (Springer, 2010)
    We use SOHO/MDI continuum images to measure the average thermal structure of bipolar spots during their initial appearance. Although the average thermal structure of penumbrae is independent of sunspot size and life span, ...

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