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Browsing by Subject "Sun: rotation"

Browsing by Subject "Sun: rotation"

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  • Abnormal rotation rates of sunspots and durations of associated flares 
    Suryanarayana, G. S; Hiremath, K. M; Bagare, S. P; Hegde, M (EDP Sciences, 2015-08)
    Context. Short-duration and long-duration flares are important in terms of their association with coronal heating and coronal mass ejections, respectively. Sunspot motions in the photosphere have been known to be associated ...
  • The extended solar cycle: muddying the waters of solar/stellar dynamo modeling or providing crucial observational constraints? 
    Srivastava, Abhishek K; McIntosh, Scott W; Arge, N; Banerjee, D; Dikpati, Mausumi; Dwivedi, Bhola N; Guhathakurta, Madhulika; Karak, B. B; Leamon, Robert J; Matthew, Shibu K; Munoz-Jaramillo, Andres; Nandy, D; Norton, Aimee; Upton, L; Chatterjee, S; Rakesh, M; Yamini K. Rao; Rahul Yadav (Frontiers, 2018-11-22)
    "In 1844 Schwabe discovered that the number of sunspots increased and decreased over a period of about 11 years, that variation became known as the sunspot cycle. Almost eighty years later, Hale described the nature of the ...
  • 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 ...
  • 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 ...
  • North-south asymmetry in solar activity: predicting the amplitude of the next solar cycle 
    Javaraiah, J (Wiley-Blackwell, 2007-05)
    Using Greenwich and Solar Optical Observing Network sunspot group data obtained during the period 1874-2005, we find that the sums of the areas of the sunspot groups in the 0°-10° latitude-interval of the Sun's northern ...
  • Solar coronal rotation determined by X-ray bright points in Hinode/XRT and Yohkoh/SXT full-disc images 
    Kariyappa, R (EDP Sciences, 2008-09)
    Aims. Our aim is to identify and trace the X-ray bright points (XBPs) over the disc and use them as tracers to determine the coronal rotation. This investigation will help to clarify and understand several issues: (i) ...
  • 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. ...
  • A theoretical model of the near-surface shear layer of the Sun 
    Jha, Bibhuti K; Choudhuri, A. R (Oxford University Press on behalf of the Royal Astronomical Society, 2021-09)
    The Sun has a near-surface shear layer (NSSL), within which the angular velocity decreases rapidly with radius. We provide an explanation of this layer based on the thermal wind balance equation. Since convective motions ...

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