Počet záznamů: 1

Analysis of narrowband emission observed in the Saturn magnetosphere

  1. 1.
    0332585 - UFA-U 2010 RIV US eng J - Článek v odborném periodiku
    Menietti, J. D. - Ye, S. - Y. - Yoon, P. H. - Santolík, Ondřej - Rymer, A. M. - Gurnett, D. A. - Coates, A. J.
    Analysis of narrowband emission observed in the Saturn magnetosphere.
    [Analýza úzkopásmové emise pozorované v magnetosféře Saturnu.]
    Journal of Geophysical Research. Roč. 114, - (2009), A06206/1-A06206/13 ISSN 0148-0227
    Výzkumný záměr: CEZ:AV0Z30420517
    Klíčová slova: narrowband emission * Saturn magnetosphere * Cassini
    Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
    Impakt faktor: 3.082, rok: 2009

    Narrowband emission is observed at Saturn centered near 5 kHz and 20 kHz and harmonics of 20 kHz. This emission appears to be in many ways similar to Jovian narrowband emission observed at higher frequencies. We analyze one example of this emission near a possible source region. In situ electron distributions suggest narrowband emission has a source region associated with electrostatic cyclotron harmonic and upper hybrid emission. Linear growth rate calculations indicate that the observed plasma distributions are unstable to the growth of electrostatic harmonic emissions. In addition, it is found that when the local upper hybrid frequency is close to 2 fce or 3 fce (fce is the electron cyclotron frequency), electromagnetic Z mode and weak ordinary (O mode) emission can be directly generated by the cyclotron maser instability. In the presence of density gradients, Z mode emission can mode-convert into O mode emission, and this might explain the narrowband emission observed by the Cassini spacecraft.

    Analýza úzkopásmové emise pozorované v magnetosféře Saturnu družicí Cassini.
    Trvalý link: http://hdl.handle.net/11104/0177803