Počet záznamů: 1
Quasiperiodic emissions observed by the Cluster spacecraft and their association with ULF magnetic pulsations
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SYSNO ASEP 0423087 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Quasiperiodic emissions observed by the Cluster spacecraft and their association with ULF magnetic pulsations Tvůrce(i) Němec, F. (CZ)
Santolík, Ondřej (UFA-U) RID, ORCID
Pickett, J. S. (US)
Parrot, M. (FR)
Cornilleau-Wehrlin, N. (FR)Celkový počet autorů 5 Zdroj.dok. Journal of Geophysical Research-Space Physics. - : Wiley - ISSN 2169-9380
Roč. 118, č. 7 (2013), s. 4210-4220Poč.str. 11 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova iInterplanetary shocks ; instruments and techniques Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech CEP GAP205/10/2279 GA ČR - Grantová agentura ČR Institucionální podpora UFA-U - RVO:68378289 UT WOS 000325073600024 DOI 10.1002/jgra.50406 Anotace Quasiperiodic (QP) emissions are electromagnetic waves at frequencies of about 0.5–4 kHz characterized by a periodic time modulation of the wave intensity, with a typical modulation period on the order of minutes. We present results of a survey of QP emissions observed by the Wide-Band Data (WBD) instruments on board the Cluster spacecraft. All WBD data measured in the appropriate frequency range during the first 10 years of operation (2001–2010) at radial distances lower than 10 RE were visually inspected for the presence of QP emissions, resulting in 21 positively identified events. These are systematically analyzed, and their frequency ranges and modulation periods are determined. Moreover, a detailed wave analysis has been done for the events that were strong enough to be seen in low-resolution Spatio-Temporal Analysis of Field Fluctuations-Spectrum Analyzer data. Wave vectors are found to be nearly field-aligned in the equatorial region, but they become oblique at larger geomagnetic latitudes. This is consistent with a hypothesis of unducted propagation. ULF magnetic field pulsations were detected at the same time as QP emissions in 4 out of the 21 events. They were polarized in the plane perpendicular to the ambient magnetic field, and their frequencies roughly corresponded to the modulation period of the QP events. 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 2014
Počet záznamů: 1