Abstract We present an overview of our recent results about solar granulation and mesogranulation, obtained with Pic du Midi observations. These results were obtained during 1986–1990 using image and spectrographic analysis of high spatial resolution data. The study of the solar granulation, with 2 Dim. “Multichannel Subtractive Double Pass” (M.S.D.P.) spectra, shows a clear change of the dynamical regime at 3″ (⋍ 2200 km ) of the photospheric velocity field when oscillatory components are filtered out. A three hour movie obtained on film at Pic du Midi Observatory and analyzed at the Lockheed Research Laboratory and the National Solar Observatory (Sacramento Peak) was used to calculate the horizontal flow pattern. The mean lifetime of the diverging areas related to mesogranulation is estimated at 3 hours; these diverging areas are swept by the supergranulation flow towards the supergranule boundary with a mean speed of 0.4 km/s.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Results from high resolution solar images and spectra obtained at the Pic du Midi Observatory (1986–1990)


    Contributors:
    Roudier, Th. (author) / Muller, R. (author) / Vigneau, J. (author) / Auffret, H. (author) / Espagnet, O. (author) / Simon, G.W. (author) / Title, A.M. (author) / Frank, Z. (author) / Shine, R.A. (author) / Tarbell, T.D. (author)

    Published in:

    Advances in Space Research ; 11 , 5 ; 205-213


    Publication date :

    1991-01-01


    Size :

    9 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    High resolution observations of active phenomena obtained at Hida Observatory

    Kurokawa, H. / Nakai, Y. / Funakoshi, Y. et al. | Elsevier | 1991


    Coronagraphic Ground Based Support for SOHO at the Pic-du-Midi Observatory

    Buecher, A. / Noeens, J. C. | British Library Online Contents | 1992


    High resolution telescopes at the National Solar Observatory

    Dunn, R.B. / Smartt, R.N. | Elsevier | 1991


    Midi Double Take - Roadtest Bedford Midi

    Weatherley,B. / Bedford,GB | Automotive engineering | 1985