AbstractWe study vorticity patterns of 897 superpenumbral filaments (in 142 sunspots) using Hα (BBSO) observations from July 2000 – April 2001. A majority (69%) of filaments show noticeable curvature in clockwise (CW) or counter-clockwise (CCW) sense. 73% of all sunspots contain both CW and CCW filaments in their superpenumbrae. Only 27% of sunspots have all their superpenumbral filaments twisted in the same direction. The average sunspot vorticity exhibits well-known hemispheric preference, but the dependence is weaker than in the previous studies: 34 (54%) out of 63 sunspots in the northern hemisphere exhibit CCW pattern of superpenumbral whirls, and 45 (69%) of 65 sunspots in the southern hemisphere show CW pattern. We suggest that the local distribution of magnetic fields around sunspots may affect the curvature of superpenumbral filaments and, hence, weaken the hemispheric helicity rule.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Vorticity patterns of sunspot Hα whirls


    Beteiligte:
    Pevtsov, A.A. (Autor:in) / Balasubramaniam, K.S. (Autor:in) / Rogers, W.J. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 32 , 10 ; 1905-1909


    Erscheinungsdatum :

    26.11.2002


    Format / Umfang :

    5 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Vorticity patterns of sunspot Ha whirls

    Pevtsov, A.A. | Online Contents | 2003


    Vorticity Patterns of Sunspot H~a~l~p~h~a Whirls

    Pevtsov, A. A. / Balasubramaniam, K. S. / Rogers, W. J. et al. | British Library Conference Proceedings | 2003


    Whirls and eddies

    Engineering Index Backfile | 1920



    Can We Predict the Occurrence of Extreme Fire Whirls?

    Kazunori Kuwana / Kozo Sekimoto / Kozo Saito et al. | AIAA | 2007