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Browsing by Author "Javaraiah, J"

Browsing by Author "Javaraiah, J"

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  • Solar cycle variations in the growth and decay of sunspot groups 
    Javaraiah, J (Springer, 2012-04)
    We analysed the combined Greenwich (1874–1976) and Solar Optical Observatories Network (1977–2011) data on sunspot groups. The daily rate of change of the area of a spot group is computed using the differences between the ...
  • Solar differential rotation and properties of magnetic clouds 
    Georgieva, K; Kirov, B; Gavruseva, E; Javaraiah, J (European Space Agency, 2005-12)
    The most geoeffective solar drivers are magnetic clouds - a subclass of coronal mass ejections (CME's) distinguished by the smooth rotation of the magnetic field inside the structure. The portion of CME's that are magnetic ...
  • Solar rotation and solar wind magnetosphere coupling 
    Georgieva, K; Kirov, B; Javaraiah, J; Krasteva, R (Elsevier, 2005-03)
    This paper deals with three characteristics of the interplanetary magnetic field (IMF), important for solar wind magnetosphere coupling and related to solar rotation: the IMF azimuthal component, the IMF total magnitude, ...
  • Solar rotation, earth rotation and solar wind 
    Kirov, B; Georgieva, K; Javaraiah, J (European Space Agency, 2003-09)
    It is generally accepted that the annual variation in the Earth's rotation rate is fully determined by large-scale seasonal changes in atmospheric circulation. We demonstrate that the oscillations of both the Earth's ...
  • Solar-Cycle Characteristics in Kodaikanal Sunspot Area: North-South Asymmetry, Phase Distribution and Gnevyshev Gap 
    Ravindra, B; Chowdhury, Partha; Javaraiah, J (Springer Nature, 2021-01)
    Solar activity is asymmetric in the two hemispheres in almost all cycles. This asymmetry is observed both in cycle amplitude and period. We have used about 90 years of sunspot-area data from the Kodaikanal Solar Observatory ...
  • Solar-Cycle-Related Variations in the Solar Differential Rotation and Meridional Flow: A Comparison 
    Javaraiah, J; Ulrich, R. K (Springer, 2006-09)
    We have analysed a large set of sunspot group data (1874 2004) and find that the meridional flow strongly varies with the phase of the solar cycle, and the variation is quite different in the northern and the southern ...
  • Study of long-term variations in hemispheric asymmetry of solar activity 
    Ravindra, B; Javaraiah, J (Cambridge University Press, 2018-02)
    Sunspot activity exhibits hemispheric asymmetry. We study the long-term variations in the hemispheric sunspot area from Kodaikanal white-light data during 1921 – 2011. The results on the presence or absence of double peak ...
  • 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 rotation and solar activity 
    Javaraiah, J (Astronomical Society of India, 2002-09)
    In my thesis I have presented many interesting properties of Sun's rotation and magnetic activity derived from extensive analysis of over 100 year photoheliographic data on sunspot activity and 26 year's data on ...
  • Study of Sun's Rotation and Solar Activity 
    Javaraiah, J (Indian Institute of Astrophysics, Bangalore, 2000-09)
  • Sunspot activity as originating in interference of the sun's global MHD oscillations 
    Gokhale, M. H; Javaraiah, J (Royal Astronomical Society, 1990-03)
    Spherical-harmonic-Fourier (SHF) analysis of sunspot activity during 1902-54 show that the sunspot occurrence probability p(theta, phi, t) is given by superposition of, mainly, axisymmetric even degree SHF modes of l not ...

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