Počet záznamů: 1
Amplitudes and frequency sweep rates of wave packets of whistler-mode chorus observed by the Cluster spacecraft
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SYSNO ASEP 0427202 Druh ASEP A - Abstrakt Zařazení RIV Záznam nebyl označen do RIV Zařazení RIV Není vybrán druh dokumentu Název Amplitudes 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 autorů 7 Zdroj.dok. AGU Fall Meeting : abstracts. - s. l : American Geophysical Union, 2013 Forma vydání Online - E Akce AGU Fall Meeting 2013 Datum konání 09.12.2013-13.12.2013 Místo konání San Francisco Země US - Spojené státy americké Typ akce WRD Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova plasma waves and instabilities ; radiation belts ; magnetospheric physics Vědní obor RIV DG - Vědy o atmosféře, meteorologie Institucionální podpora UFA-U - RVO:68378289 Anotace Whistler-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. Pracoviště Ústav fyziky atmosféry Kontakt Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Rok sběru 2015
Počet záznamů: 1