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  1. No Access

    Article

    Magnetic changes observed in the formation of two filaments in a complex active region: TRACE and MSDP observations

    This paper is focused on the formation of two filaments in a complex center of decaying active regions (AR 8329 and AR 8326), located in the northern hemisphere. The observations were obtained in Hα by the Mul...

    Brigitte Schmieder, Nicole Mein, Yuanyong Deng, Cristiana Dumitrache… in Solar Physics (2004)

  2. No Access

    Article

    Dynamics of post-flare ejections and magnetic loop geometry

    Flare-associated mass ejections have been observed at the solar limb on June 29, 1980 in the Hα line, with the Multichannel Subtractive Double Pass spectrograph of the Meudon solar tower. Radial velocities wer...

    Pierre Mein, Nicole Mein in Solar Physics (1982)

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    Article

    Wave reflections in the solar atmosphere

    The small phase-lag between velocities observed at different chromospheric levels is interpreted as being due to acoustic waves reflected by the very hot atmospheric layers of the chromosphere-corona transitio...

    Janine Provost, Nicole Mein in Solar Physics (1979)

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    Article

    Velocity waves in the quiet solar chromosphere

    Propagation of velocity waves are investigated in the solar chromosphere, with a special view to high frequencies (periods ≥ 60 s). Four line profiles have been observed during 27 mn with the Sacramento Peak v...

    Nicole Mein, Pierre Mein in Solar Physics (1976)

  5. No Access

    Article

    The hydrogen balmer lines and the structure of the quiet solar chromosphere

    Spectra of Hα, Hβ and Hδ have been taken under good seeing conditions with the vacuum tower telescope of Sacramento Peak Observatory. Intensity curves are given at various wavelengths in these lines to permit fur...

    Pierre Mein, Nicole Mein in Solar Physics (1975)