Počet záznamů: 1  

Amplitudes and frequency sweep rates of wave packets of whistler-mode chorus observed by the Cluster spacecraft

  1. 1.
    SYSNO ASEP0427202
    Druh ASEPA - Abstrakt
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    NázevAmplitudes and frequency sweep rates of wave packets of whistler-mode chorus observed by the Cluster spacecraft
    Tvůrce(i) Macúšová, E. (CZ)
    Santolík, Ondřej (UFA-U) RID, ORCID
    Pickett, J. S. (US)
    Gurnett, D. A. (US)
    Cornilleau-Wehrlin, N. (FR)
    Demekhov, A. G. (RU)
    Titova, E. E. (RU)
    Celkový počet autorů7
    Zdroj.dok.AGU Fall Meeting : abstracts. - s. l : American Geophysical Union, 2013
    Forma vydáníOnline - E
    AkceAGU Fall Meeting 2013
    Datum konání09.12.2013-13.12.2013
    Místo konáníSan Francisco
    ZeměUS - Spojené státy americké
    Typ akceWRD
    Jazyk dok.eng - angličtina
    Země vyd.US - Spojené státy americké
    Klíč. slovaplasma waves and instabilities ; radiation belts ; magnetospheric physics
    Vědní obor RIVDG - Vědy o atmosféře, meteorologie
    Institucionální podporaUFA-U - RVO:68378289
    AnotaceWhistler-mode chorus is one of the most intense electromagnetic wave emissions observed in the inner magnetosphere, usually outside the plasmasphere. These waves play an important role in wave-particle interactions. They are usually generated close to the geomagnetic equator in a wide range of L-shells, and they propagate toward larger magnetic latitudes. Whistler-mode chorus is sometimes composed of two frequency bands separated by a gap at one half of the electron cyclotron frequency. At short time scales (on the order of hundreds of milliseconds) chorus consist of different discrete spectral shapes: rising tones, falling tones, constant frequency tones, and hooks. Our survey is based on high time resolution measurements collected by the WBD instrument onboard four Cluster spacecraft. We analyze time intervals containing different types of spectral shapes occurring at different L-shells, and at different latitudes relative to the chorus source region, as it is determined from measurements of the STAFF-SA instrument. Each of these events includes a large number of individual wave packets (between a few hundreds to a few thousands). For each individual wave packet we determine the frequency sweep rate and the average amplitude. Our results confirm previous conclusions of numerical simulations, theoretical predictions, and case studies showing that the amplitude of chorus wave packets increases with an increasing frequency sweep rate. The amplitude also increases as the wave forming chorus propagate away from the equator. The scatter of obtained values of frequency sweep rates and amplitudes is much larger closer to the Earth than at larger radial distances. This work receives EU support through the FP7-Space grant agreement no 284520 for the MAARBLE collaborative research project.
    PracovištěÚstav fyziky atmosféry
    KontaktKateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019
    Rok sběru2015
Počet záznamů: 1  

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