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Browsing by Author "Javaraiah, J"

Browsing by Author "Javaraiah, J"

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  • Relationship between magnetic structures of small and large sunspot groups 
    Javaraiah, J (Astronomical Society of the Pacific, 2003)
    Using the data on sunspot groups of life span (T, in days) 2-12day during 1874-1981 we find: (i) the average area (A, in millionth of solar hemisphere) of a spot group increase with T as A(T) = 15.24 exp (T/4.48); and (ii) ...
  • Search for short-term periodicities in the sun's surface rotation: a revisit 
    Javaraiah, J; Ulrich, R. K; Bertello, L; Boyden, J. E (Springer Netherlands, 2009-06)
    We have used the daily values of the equatorial rotation rate determined from the Mt. Wilson daily Doppler-velocity measurements during the period 3 December 1985 – 5 March 2007 to search for periodicities in the solar ...
  • Short-term periodicities in the north-south asymmetry of the Sun's surface rotation 
    Javaraiah, J (Astronomical Society of India, 2002-09)
    Power spectra of N-S asymmetries of the coefficients A and (j of the Sun's surface differential rotation determined from the Mt. Wilson velocity data during 1982-1994 suggest the existence of a period at 374 ± 30 day in ...
  • Short-term periodicities of solar differential rotation 
    Javaraiah, J (Astronomical Society of India, 1998)
  • Short-term periodicities of the sun's `mean' and differential rotation 
    Javaraiah, J; Komm, R. W (Kluwer Academic Publishers, 1999-01)
    We have looked for periodicities in solar differential rotation on time scales shorter than the 11-year solar cycle through the power- spectrum analysis of the differential rotation parameters determined from Mt. Wilson ...
  • Short-term variations in solar rotation rate and solar wind parameters 
    Georgieva, K; Javaraiah, J; Kirov, B; Atanasov, D (European Space Agency, 2002-12)
    The components of the interplanetary magnetic field (IMF) at the Earth's orbit are described by the model of Parker [1958]. In it, the solar rotation rate is assumed constant. In the present paper we compare in-situ ...
  • Solar asymmetry and sun-earth connections 
    Georgieva, K; Kirov, B; Javaraiah, J (European Space Agency, 2003-09)
    The effect of solar activity on climate depends on the North-South solar activity asymmetry: the correlation between solar activity and a number of meteorological elements has opposite signs for predominantly more active ...
  • The solar cycle 
    Javaraiah, J; Rozelot, J. P; Bertello, L (Hindawi Publishing Corporation, 2012-06)
    The Sun provides variable energetic and magnetic field input to the conditions in the heliosphere which directly affect the magnetosphere. In particular, the Sun's variable magnetic fields constitute a rich source for ...
  • 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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