Abstract Progress made on recent theories for the 2 – 3 kHz radio emissions in the outer heliosphere is summarized. The theories involve radiation produced near ƒ p and/or p , by nonlinear processes involving Langmuir waves, when solar wind density enhancements enter the foreshock region sunwards of the termination shock. Two classes of events have been detected by Voyager: transient drifting emissions and a relatively continuous 2 kHz component. Foreshock theories for both types of emissions are presented and discussed, with emphasis placed on the role of density inhomogeneities. Our conclusions are as follows. (1) The levels and characteristics of the transient events are consistent with the expectations of the foreshock theory. The source may be located outside 50 AU. (2) The higher foreshock wave levels and enhanced density regions associated with stream-stream interactions in the outer heliosphere provide rationales for McNutt's trigger hypothesis. (3) A foreshock theory cannot easily account for the 2 kHz component's almost constant frequency range. Explanations in terms of steady density enhancements or an alternative source region and/or emission mechanism should be sought.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Foreshock theories for the outer heliospheric radio emissions


    Beteiligte:

    Erschienen in:

    Advances in Space Research ; 13 , 6 ; 205-208


    Erscheinungsdatum :

    01.01.1993


    Format / Umfang :

    4 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    The Electron Foreshock

    Fitzenreiter, R. J. / Committee on Space Research; Scientific Commission D | British Library Conference Proceedings | 1995


    The Electron Foreshock

    Fitzenreiter, R.J. | Online Contents | 1995


    The electron foreshock

    Fitzenreiter, R. J. | NTRS | 1995


    ULF Waves in the Foreshock

    Greenstadt, E. W. / Le, G. / Strangeway, R. J. et al. | British Library Conference Proceedings | 1995