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Browsing by Author "Hiremath, K. M"

Browsing by Author "Hiremath, K. M"

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  • Latitude character and evolution of Gnevyshev gap 
    Pandey, K. K; Hiremath, K. M; Yellaiah, G (Springer, 2017-06)
    The time interval, between two highest peaks of the sunspot maximum, during which activity energy substantially absorbed is called Gnevyshev gap. In this study we focus on mysterious evolution of the Gnevyshev gap by ...
  • Latitudinal distribution of soft x ray flares and dispairty in butterfly diagram 
    Pandey, K. K; Yellaiah, G; Hiremath, K. M (Springer, 2015-04)
    We present statistical analysis of about 63000 soft x-ray flare (class ≥C) observed by geostationary operational environmental satellite (GOES) during the period 1976-2008. Class wise occurrence of soft X-ray (SXR) flare ...
  • Longitudinal flows in stellar magnetic flux tubes 
    Gokhale, M. H; Hiremath, K. M (Elsevier, 1986)
    It is shown that if a thin, isolated and untwisted magnetic flux tube, consisting of a current-free core bounded by a thin current sheath, is in an ‘overall’ equilibrium in a stratified atmosphere, then there is, in general, ...
  • Lowering of asymmetry 
    Pandey, K. K; Hiremath, K. M; Yellaiah, G (Indian Academy of Sciences, 2017-03)
    Asymmetry, a well established fact, can be extracted from various solar atmospheric activity indices. Although asymmetry is being localized within short time scale, it also persists at different time scales. In the present ...
  • Magnetic Field Structure of Mercury 
    Hiremath, K. M (Elsevier B.V., 2012-04)
    Recently planet Mercury-an unexplored territory in our solar system-has been of much interest to the scientific community due to recent flybys of the spacecraft MESSENGER that discovered its intrinsic stationary and ...
  • Magnetic flux in the solar convective envelope inferred from the initial observations of the sunspots 
    Hiremath, K. M; Lovely, M. R (University of Chicago Press, 2007-09)
    Different life spans of the sunspots suggest their origin at different depths and by measuring magnetic fluxes from their first observation on the surface, one can estimate the strength of magnetic flux at different anchoring ...
  • Metallicity of Sun-like G-stars that have exoplanets 
    Gurumath, S. R; Hiremath, K. M; Ramasubramanian, V (Indian Academy of Sciences, 2017-07)
    By considering the physical and orbital characteristics of G type stars and their exoplanets, we examine the association between stellar mass and its metallicity that follows a power law. Similar relationship is also ...
  • Model of 'steady' Parts of Rotation and Magnetic Field in the Sun's Convection Zone 
    Hiremath, K. M; Gokhale, M. H (European Space Agency, 1995-06)
    We present a preliminary model of the ‘steady’ parts of rotation and magnetic field in the sun’s convective envelope, which vary on diffusion time scales, within the frame work of axisymmetric incompressible hydromagnetics ...
  • A model of the 'steady' and 'fluctuating' parts of the sun's internal magnetic field 
    Gokhale, M. H; Hiremath, K. M (American Astronomical Society, 1993-04-10)
    We model the structure of the 'steady' (slowest varying) part of the sun's internal poloidal magnetic field assuming it to be (for given reasons and in the relevant domain) a current-free field whose field lines 'isorotate' ...
  • Nearly Century-scale Variation of the Sun’s Radius 
    Hiremath, K. M; Rozelot, J. P; Sarp, V; Kilcik, A; Pavan, D. G; Gurumath, S. R (IOP Publishing, 2020-03-10)
    The Kodaikanal Archive Program (India) is now available to the scientific community in digital form as daily digitized solar white light pictures, from 1923 to 2011. We present here the solar radius data, obtained after a ...
  • 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 ...

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