IIA Institutional Repository

Browsing by Subject "H alpha line"

Browsing by Subject "H alpha line"

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  • The variation of photospheric active regions in HD 127535 
    Mekkaden, M. V; Geyer, E. H (European Southern Observatory, 1988-04)
    UBVRI photometry of the chromospherically active star HD 127535 obtained during April 1987 is presented. The analysis shows that the light variation is quasi-sinusoidal and the amplitude and the phase of the light minimum ...
  • VLA observations of solar active regions at 6 and 20 CM 
    Alissandrakis, C. E; Kundu, M. R; Shevgaonkar, R. K (The European Southern Observatory, 1991-11)
    High-resolution observations are presented of two active regions at 6 and 20 cm over a period of 5 days, together with H-alpha and photospheric magnetic fields. The large-scale emission at 20 cm is associated with the ...

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