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Browsing Publications of Astronomical Society of India by Author "Hasan, S. S"

Browsing Publications of Astronomical Society of India by Author "Hasan, S. S"

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  • The effect of p-modes on thin magnetic flux tubes 
    Hasan, S. S; Bogdan, T. J (Astronomical Society of India, 1996)
    We examine the effect of p-modes impinging on thin magnetic flux tubes. The aim of the study is to see whether global p-modes can excite wave motions of significant amplitude in a magnetic flux tube. For simplicity we treat ...
  • Helioseismology - Impact and Implications 
    Hasan, S. S (Astronomical Society of India, 1995-09)
  • Modelling sunspot equilibrium through a solution of the time dependent MHD equations 
    Gangadhara, R. T; Hasan, S. S (Astronomical Society of India, 1996)
    We numerically simulate the dynamical relaxation to equilibrium of a sunspot. Treating the sunspot as a thick axisymmetric flux tube in cylindrical geometry, we solve the time dependent MHD equation to examine the evolution ...
  • Reconstruction of Total Solar Irradiance on Multiple Time Scales 
    Jain, K; Hasan, S. S (Astronomical Society of India, 2003)
    We have developed regression models of total solar irradiance on different time scales by parameterizing the combined influence of sunspots and faculae. These models are useful in identifying the key parameters responsible ...
  • Structure of small-scale magnetic flux tubes and excitation of sausage mode oscillations 
    Hasan, S. S (Astronomical Society of India, 1998)
    The nature of small-scale magnetic fields in the solar atmosphere is discussed. In the first part of the review, equilibrium models for the structure of magnetic flux tubes are presented. It is shown that the thermodynamic ...
  • Wave leakage in a magnetized isothermal atmosphere 
    Banerjee, D; Hasan, S. S; Christensen-Dalsgaard, J (Astronomical Society of India, 1996)
    The present investigation is a continuation of earlier work by Hasan & christensen-Dalsgaard (1992) and Banerjee, Hasan & Christensen-Dalsgaard(1995), where the interaction of various elementary modes in a stratified ...

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