Počet záznamů: 1  

Spectral features of lightning-induced ion cyclotron waves at low latitudes: DEMETER observations and simulation

  1. 1.
    0386748 - ÚFA 2013 RIV US eng J - Článek v odborném periodiku
    Shklyar, D. R. - Storey, L. R. O. - Chum, Jaroslav - Jiříček, František - Němec, F. - Parrot, M. - Santolík, Ondřej - Titova, E. E.
    Spectral features of lightning-induced ion cyclotron waves at low latitudes: DEMETER observations and simulation.
    Journal of Geophysical Research. Roč. 117, A12 (2012), A12206/1-A12206/16. ISSN 0148-0227
    Grant CEP: GA ČR GA205/09/1253; GA ČR GAP205/10/2279; GA MŠMT ME09107
    Grant ostatní: GA ČR(CZ) GPP209/12/P658
    Program: GP
    Institucionální podpora: RVO:68378289
    Klíčová slova: Plasma waves analysis * ion cyclotron waves * satellite observation and numerical simulation * geometrical optics * multi-component measurements * simulation * spectrogram * wave propagation
    Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
    Impakt faktor: 3.174, rok: 2012
    http://onlinelibrary.wiley.com/doi/10.1029/2012JA018016/abstract

    We use a comprehensive analysis of 6-component ELF wave data from the DEMETER satellite to study proton whistlers, placing emphasis on low-latitude events originating from lightning strokes in the hemisphere opposite to the hemisphere of observation. In this case, the formation of proton whistlers does not involve mode conversion caused by a strong mode coupling at a crossover frequency, although a polarization reversal remains an important element in formation of the phenomenon. DEMETER measurements of the six electromagnetic field components in the frequency band below 1000 Hz make it possible to determine not only the dynamic spectrum, but also the wave polarization, the wave normal angle, and the normalized parallel component of the Poynting vector. This permits us to address fine features of proton whistlers, in particular, we show that the deviation of the upper cutoff frequency from the equatorial cyclotron frequency is related to the Doppler shift. Experimental study of proton whistlers is supplemented by an investigation of ion cyclotron wave propagation in a multicomponent magnetoplasma and by numerical modeling of spectrograms, both in the frame of geometrical optics.
    Trvalý link: http://hdl.handle.net/11104/0216018

     
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