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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Solar cycle and seasonal variations in F-region vertical drifts over Kodaikanal, India 
    Ramesh, K. B; Sastri, J. H (European Geophysical Society, 1995-06)
    Measurements of the changes in phase path of F-region reflections at normal incidence at Kodaikanal (77°28'E, 10°14'N, dip 3°N) from February 1991 to February 1993 are used to determine the variation of the equatorial ...
  • Solar cycle and seasonal variations in the equatorial ionospheric F-region 
    Ganesh, K. S (Pergamon Press Ltd, 1965)
    Representative (N -- h) profiles have been obtained from Kodaikanal ionograms covering a period of about one solar cycle, for the study of the effect of solar activity on the ionic densities at different levels in the ...
  • The solar cycle and the associated behaviours of sunspots and prominences 
    Das, A. K (Government Observatory, Madras, 1958-01)
  • 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 ...
  • Solar Cycle Evolution of Filaments over a Century: Investigations with the Meudon and McIntosh Hand-drawn Archives 
    Mazumder, Rakesh; Chatterjee, Subhamoy; Nandy, Dibyendu; Banerjee, D (IOP Publishing, 2021-10-01)
    Hand-drawn synoptic maps from the Meudon Observatory (1919 onwards) and the McIntosh archive (1967 onwards) are two important sources of long-term, manually recorded filament observations. In this study, we calibrate the ...
  • Solar Cycle Phase Dependence of Supergranular Fractal Dimension 
    Paniveni, U; Krishan, V; Singh, J; Srikanth, R (Indian Academy of Sciences, 2011-06)
    We study the complexity of supergranular cells using the intensity patterns obtained from the Kodaikanal Solar Observatory during the 23rd solar cycle. Our data consists of visually identified supergranular cells, from ...
  • 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 cycle variations of coronal neutral lines and polar regions activity 
    Makarov, V. I; Makarova, V. V; Koutchmy, S; Sivaraman, K. R (National Solar Observatory, 1988-07)
  • Solar cycle variations of the EUV network characteristics from SDO/AIA 
    Varghese, Bilin Susan; Raju, K. P; Kurian, P. J; Paul, Issac (Springer Nature, 2022-01)
    It is well-known that there is a close relationship between the supergranules, magnetic field and the Extreme-UltraViolet (EUV) network of the solar atmosphere. We have obtained the network characteristics from the imaging ...
  • 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 dynamics imaging system a back-end instrument for the proposed NLST 
    Ramesh, K. B; Vasantharaju, N; Hemanth, P; Reardon, K (Springer, 2016-12)
    The Solar Dynamics Imaging System (SDIS) will be one of the focal plane instruments operated at the National Large Solar Telescope (NLST). The prime objective of the instrument is to obtain high spatial and temporal ...
  • Solar Dynamo Problem 
    Gokhale, M. H (Indian Institute of Astrophysics, Bangalore, 1984)
  • Solar Dynamo Problem 
    Gokhale, M. H (Indian Institute of Astrophysics, Banglore, 1984)
    The origin of solar magnetic field and the flux tube nature of this field on the smallest observed scales are two key problems in solar magnetohydrodynamics. Despite the sucess of kinematical models based on the turbulent ...
  • The solar dynamo with meridional circulation 
    Choudhuri, A. R; Schuessler, M; Dikpati, M (European Southern Observatory, 1997-03)
    In the mathematical form for the coefficient given in the expression (4) in this paper, the value of the parameters d and d should actually be 0.025R/sub0 instead of as printed. We became aware of this typographical error ...
  • The solar dynamo with meridional circulation. 
    Choudhuri, A. R; Schussler, M; Dikpati, M (1995-11)
    We show that meridional circulation can have a profound influence on dynamo models for the solar cycle. Motivated by the observed tilt angles of sunspot groups we assume that the generation of the poloidal field takes place ...
  • Solar Eclipse and its effect on Epilepsy 
    Sheji, P (Indian Institute of Astrophysics, Bangalore, 1997)
    A study was conducted at the Indian Epilepsy foundation to investigate the possibility of seizure being precipitated by the solar eclipse viewed on October 24, 1995. 47 known epileptic parient were included under the ...
  • Solar eclipses - A powerful tool for the study of nature 
    Bhattacharyya, J. C (National Institute of Science Communication and Information Resources, 1990-12)
    Solar eclipses occur due to periodic coincidences in positions of the moon and the earth with respect to the sun. Characteristics of their orbital paths determine the periodicity, duration and shape, lengths and orientations ...
  • Solar eclipses in India’s cultural and political history 
    Kapoor, R. C (Cambridge University Press, 2021-12)
    This contribution presents earliest records in the Indian stone inscriptions and literature that specifically mention the eclipse as total or annular and the eclipses that timed with wars. Solar cult temples can be found ...
  • Solar flare effects on the geomagnetic elements during normal and counter electrojet periods 
    Rastogi, R. G; Pathan, B. M; Rao, D. R. K; Sastry, T. S; Sastri, J. H (Terra Scientific Publishers, 1999-09)
    During a strong and normal electrojet event time, sfeconsists of a positive impulse in Hat all stations, the amplitude of Hfollowing the latitudinal variation similar to that of the quiet day monthly mean, Sq(H). The sfein ...
  • Solar forcing on the changing climate 
    Hiremath, K. M (Balkan, Black Sea and Caspian Sea, 2009-04)
    The influence of solar cycle and activity phenomena on the two climatic variabilities such as the rainfall and the surface temperature of the Indian subcontinent is critically examined. It is concluded from this study that ...

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