Abstract We report on the observations of a number of flares at a wavelength of 3.5 mm during the 1991 June solar campaign. Many flares, including small ones, show an impulsive phase at milllimeter wavelengths which indicates the presence of MeV electrons, and the millimeter observations are far more sensitive to such electrons than are current γ-ray detectors. However, these energetic electrons do not always show a good correlation with the lower-energy electrons which produce hard X-rays below 100 keV. The production efficiency of MeV electrons seems to vary considerably from flare to flare. An extended phase similar to the soft X-ray behaviour is also seen at millimeter wavelengths, which we attribute to dense hot material radiating thermal bremsstrahlung. In the impulsive onset the millimeter emission seems to be consistently delayed with respect to the hard X-rays.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Interferometric observations of solar flares at 3 mm wavelength


    Beteiligte:
    Kundu, M.R. (Autor:in) / White, S.M. (Autor:in) / Gopalswamy, N. (Autor:in) / Lim, J. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 13 , 9 ; 289-293


    Erscheinungsdatum :

    01.01.1993


    Format / Umfang :

    5 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Multi-Wavelength Observations of the Pre-Cursor Phase of Solar Flares

    Matthews, S. A. / Harra, L. K. / Culhane, J. L. et al. | British Library Conference Proceedings | 2003


    High spatial resolution observations of solar flares at 3.3 mm wavelength

    Kundu, M.R. / White, S.M. / Welch, W.J. et al. | Elsevier | 1991


    High spatial resolution observations of solar flares at 3.3 mm wavelength

    Kundu, M. R. / White, S. M. / Welch, W. J. et al. | NTRS | 1991


    Future optical observations of solar flares

    Falciani, R. | Elsevier | 1989