IIA Institutional Repository

Browsing by Subject "Plages"

Browsing by Subject "Plages"

Sort by: Order: Results:

  • Analysis of Solar Hemispheric Chromosphere Properties using the Kodaikanal Observatory Ca–K Index 
    Chowdhury, Partha; Ravindra, B; Bertello, Luca; Pevtsov, Alexei A (IOP Publishing, 2022-01-20)
    The Kodaikanal Observatory has provided long-term synoptic observations of chromospheric activities in the Ca ii K line (393.34 nm) since 1907. This article investigates temporal and periodic variations of the hemispheric ...
  • Ca II K Emission in Canopus 
    Bappu, M. K. V; Mekkaden, M. V; Kameswara Rao, N (Astronomical Society of India, 1984-06)
    The Changes in the Ca II K line profile of the F0 supergiant Canopus have been studied from the high dispersion coude spectrograms obtained since 1975. The emission in the core of the line is variable in a timescale of few ...
  • Comparison among Ca II K spectroheliogram time series with an application to solar activity studies 
    Ermolli, I; Solanki, S. K; Tlatov, A. G; Krivova, N. A; Ulrich, R. K; Singh, J (Institute of Physics, 2009-06)
    Various observatories around the globe started regular full-disk imaging of the solar atmosphere in the Ca II K line in the early decades of the 20th century. The archives made by these observations have the potential of ...
  • Equator to Pole Solar Chromospheric Differential Rotation Using Ca-K Features Derived from Kodaikanal Data 
    Kharayat, Hema; Singh, J; Priyal, M; Ravindra, B (American Astronomical Society, 2024-06-20)
    Differential rotation is one of the basic characteristics of the Sun, and it plays an important role in generating the magnetic fields and its activities. We investigated rotation rate using chromospheric features such ...
  • On the triggering of quiet region flares without filament activation 
    Sundararaman, K; Selvendran, R (Astronomical Society of India, 1997)
    Using Kodaikanal Observations we have analysed the cases of quiet region flares which are not associated with any filament activation. The rotations of the plages play a major role in triggering these spotless flares. The ...
  • Polar Network Index as a Magnetic Proxy for the Solar Cycle Studies 
    Priyal, M; Banerjee, D; Karak, B. B; Munoz-Jaramillo, A; Ravindra, B; Choudhuri, A. R; Singh, J (IOP Publishing, 2014-09-20)
    The Sun has a polar magnetic field which oscillates with the 11 yr sunspot cycle. This polar magnetic field is an important component of the dynamo process which operates in the solar convection zone and produces the sunspot ...
  • Temporal and Latitudinal Variations in Ca-K Plage and Network Area: An Implication for Meridional Flows 
    Priyal, M; Singh, J; Ravindra, B; Sindhuja, G (American Astronomical Society, 2023-02-20)
    The Ca-K spectroheliograms obtained at the Kodaikanal observatory are used to generate a uniform time series using the equal-contrast technique for studying the long- and short-term variations in the solar chromosphere. ...
  • Wave propagation and energy transport in the magnetic network of the Sun 
    Vigeesh, G; Hasan, S. S; Steiner, O (European Southern Observatory, 2009-12)
    Aims. We investigate wave propagation and energy transport in magnetic elements, which are representatives of small scale magnetic flux concentrations in the magnetic network on the Sun. This is a continuation of earlier ...

Search DSpace

Browse

My Account