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Browsing by Author "Ramesh, K. B"

Browsing by Author "Ramesh, K. B"

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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 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 spectropolarimetry of Ca II 8542 Å line: polarimeter development, calibration, and preliminary observations 
    Hemanth, P; Nagaraju, K; Ravindra, B; Ramesh, K. B (SPIE-The International Society for Optical Engineering, 2018-11)
    Chromospheric magnetic fields are of paramount importance in understanding the dynamics of energetic events in the solar atmosphere. At the Kodaikanal Solar Observatory, several polarimeters were developed in the past to ...
  • Solar X-Ray Spectral Irradiance Variability 
    Ramesh, K. B; Sundararaman, K (Springer, 2006-04)
    Solar spectral irradiance at X-ray wavelengths show large variations over a period of solar cycle. We use X-ray irradiance data in three narrow spectral regimes deduced from Yohkoh SXT measurements to study coronal irradiance ...
  • Spot and filament rotation in a sigmoidal flare 
    Sundararaman, K; Ramesh, K. B; Selvendran, R (Astronomical Society of India, 2001)
    The role played by the rotation of the umbrae in a sunspot with respect to the H? filament in inducing magnetic shear for the sigmoidal brightening is reported in this paper. We carried out these studies by using photoheliogram ...
  • Studies in Dynamics of the Equatorial Ionosphere 
    Ramesh, K. B (Indian Institute of Astrophysics, Bangalore, 1994-03)
  • A System for Recording Phase Path Variations of Ionospheric Reflections 
    Sastri, J. H; Ramesh, K. B; Ramamoorthy, K. S (Indian Institute of Astrophysics, Bangalore, 1985-11)
    An experimental set-up developed for continuous recording of the phase path variations of reflections at normal incidence from discrete regions of the terrestrial ionosphere is described. Salient features of the system ...
  • Temporal offsets among solar activity indicators 
    Ramesh, K. B; Vasantharaju, N (Springer, 2014-04)
    Temporal offsets between the time series of solar activity indicators provide important clues regarding the physical processes responsible for the cyclic variability in the solar atmosphere. Hysteresis patterns generated ...
  • Transient composite electric field disturbances near dip equator associated with auroral substorms 
    Sastri, J. H; Ramesh, K. B; Rao, H. N. R (American Geophysical Union, 1992-07)
    Ionosonde data of Kodaikanal (Geog.Long. 77° 29′E, dip 3.0°N) and Huancayo (Geog.Long. 75°18′W, dip 2.0°N) are used to show the simultaneous occurrence of a transient disturbance in F region height of composite polarity ...

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