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Case studies of quasi-periodic VLF emissions and related ULF fluctuations of the magnetic field
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SYSNO ASEP 0436792 Document Type A - Abstract R&D Document Type The record was not marked in the RIV R&D Document Type Není vybrán druh dokumentu Title Case studies of quasi-periodic VLF emissions and related ULF fluctuations of the magnetic field Author(s) Hayosh, Mykhaylo (UFA-U) RID, ORCID
Santolík, Ondřej (UFA-U) RID, ORCID
Němec, F. (CZ)
Parrot, M. (FR)Source Title AGU Fall Meeting. - s. l : American Geophysical Union, 2014 Number of pages 1 s. Action AGU Fall Meeting Event date 15.12.2014-19.12.2014 VEvent location San Francisco Country US - United States Event type WRD Language eng - English Country US - United States Institutional support UFA-U - RVO:68378289 Annotation Quasi-periodic (QP) VLF emissions are observed in the inner magnetosphere mostly on the day-side. These waves exhibit a periodic time modulation of the wave intensity that is possibly a result of the whistler-mode wave growth being periodically modulated by compressional ULF magnetic field pulsations. We have analyzed 50 QP events measured by the DEMETER satellite at altitudes of about 700 km to verify their generation mechanism. The analyzed events have a modulation period between 15 s and 80 s, and they were observed during quiet geomagnetic conditions (Kp<3). Magnetometers of the CARISMA system were used for monitoring the ULF magnetic field pulsations in a wide spatial range. We have found that ULF magnetic field pulsations in the Pc3 - Pc5 range are well correlated with the occurrence of the QP emissions with modulation periods between about 40 and 80 s. At the same time, increased fluxes of high-energy electrons (E > 30 keV) were observed by DEMETER and by the NOAA-17 satellite. We analyze possible links between these electrons, QP emissions, and ULF magnetic field pulsations. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2015
Number of the records: 1