Počet záznamů: 1  

First observation of lion roar-like emissions in Saturn’s magnetosheath

  1. 1.
    0474187 - ÚFA 2018 DE eng A - Abstrakt
    Píša, David - Sulaiman, A. H. - Santolík, Ondřej - Hospodarsky, G. B. - Kurth, W. S. - Gurnett, D. A.
    First observation of lion roar-like emissions in Saturn’s magnetosheath.
    Geophysical Research Abstracts. Göttingen: European Geosciences Union, 2017. EGU2017-682. ISSN 1607-7962.
    [EGU General Assembly 2017. 23.04.2017-28.04.2017, Vienna]
    Institucionální podpora: RVO:68378289
    Klíčová slova: electromagnetic whistler mode waves * magnetosheath * Saturn’s
    Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
    http://meetingorganizer.copernicus.org/EGU2017/EGU2017-682.pdf

    Electromagnetic whistler mode waves known as "lion roars" have been reported by many missions inside the
    terrestrial magnetosheath. We show the observation of similar intense emissions in Saturn’s magnetosheath as
    detected by the Cassini spacecraft. The emissions were observed inside the dawn sector (MLT∼0730) of the magnetosheath
    over a time period of nine hours before the satellite crossed the bow shock and entered the solar wind.
    The emissions were narrow-banded with a typical frequency of about 15 Hz well below the local electron cyclotron
    frequency (fce ∼100 Hz). Using the minimum variance analysis method, we show that the waves are right hand
    circularly polarized and propagate at small wave normal angles with respect to the ambient magnetic field. Here,
    for the first time, we report the evidence of lion roar-like emissions in Saturn’s magnetosheath which represents a
    new and unique parameter regime.
    Trvalý link: http://hdl.handle.net/11104/0271296

     
     
Počet záznamů: 1  

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