We summarize high-resolution microwave observations (VLA) of heating and magnetic triggering in coronal loops. Magnetic changes that precede solar eruptions on time scales of tens of minutes involve primarily emerging coronal loops and the interaction of two or more loops. Thermal cyclotron lines have been detected in coronal loops, suggesting the presence of hot current sheets that enhance emission from relatively thin layers of enhanced temperature and constant magnetic field. These current sheets may play a role in the excitation of solar bursts. A filament-associated source with a high brightness temperature and steep radiation spectrum occurs above a region of apparently weak photospheric field. This source might be attributed to currents that enhance coronal magnetic fields. Compact (phi=5 sec) transient sources with lifetimes of 30 to 60 minutes have also been detected in regions of apparently weak photospheric field. We conclude by comparing VLA observations of coronal loops with simultaneous SMM-XRP observations.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Solar burst precursors and energy build-up at microwave wavelengths


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    1986-01-01



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    Solar Active Region Development at Millimetre Wavelengths

    Pohjolainen, S. / Urpo, S. | British Library Online Contents | 1997


    Solar flare precursors

    Van Hoven, G. / Hurford, G. J. | NTRS | 1986


    Recent results on solar activity at submillimeter wavelengths

    de Castro, C.G.Giménez | Online Contents | 2005


    Recent results on solar activity at submillimeter wavelengths

    de Castro, C.G. Giménez / Kaufmann, P. / Raulin, J.-P. | Elsevier | 2005