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Browsing by Subject "Periodicity"

Browsing by Subject "Periodicity"

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  • Long-term optical flux and colour variability in quasars 
    Sukanya, N; Stalin, C. S; Jeyakumar, S; Praveen, D; Dhani, A; Damle, R (IOP Publishing, 2016-02)
    We have used optical V and R band observations from the Massive Compact Halo Object (MACHO) project on a sample of 59 quasars behind the Magellan ic clouds to study their long term optical flux and colour ...
  • A new cycle in the periodicity of solar flare indices. 
    Das, T. K; Nag, T. K (Astronomical Society of India, 2003)
    A new cycle of about 5.5 years has been invoked in case of the periodicity in solar flare indices. As there exists no instrumental technique for measuring directly the energy output of an optical flare, the energy emitted ...
  • Origin of the Solar Rotation Harmonics Seen in the EUV and UV Irradiance 
    Giono, G; Zender, J. J; Kariyappa, R; Dame, L (Springer, 2021-11)
    Long-term periodicities in the solar irradiance are often observed with periods proportional to the solar rotational period of 27 days. These periods are linked either to some internal mechanism in the Sun or said to be ...
  • Study of Three Homologous Solar Flares Observed from Active Region NOAA 9033 on 12th June 2000 
    Verma, V. K; Vats, H. O (Astronomical Society of India, 2003)
    In the paper, we present a study of three homologous H flares observed on 12th June 2000 in active region (AR) NOAA 9033. During the observation of AR NOAA 9033 on 12th June 2000, we observed 1st solar flare between 0135-0155 ...

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