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Statements

Subject Item
n2:RIV%2F68378289%3A_____%2F13%3A00392553%21RIV14-AV0-68378289
rdf:type
n3:Vysledek skos:Concept
dcterms:description
Quasi-periodic (QP) emissions are electromagnetic emissions at frequencies of about 0.5-4 kHz that are characterized by a periodic time modulation of the wave intensity. Typical periods of this modulation are on the order of minutes. We present a case study of a large-scale long-lasting QP event observed simultaneously on board the DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) and the Cluster spacecraft. The measurements by the Wide-Band Data instrument on board the Cluster spacecraft enabled us to obtain high-resolution frequency-time spectrograms of the event close to the equatorial region over a large range of radial distances, while the measurements by the STAFF-SA instrument allowed us to perform a detailed wave analysis. Conjugate observations by the DEMETER spacecraft have been used to estimate the spatial and temporal extent of the emissions. The analyzed QP event lasted as long as 5 h and it spanned over the L-shells from about 1.5 to 5.5. Simultaneous observations of the same event by DEMETER and Cluster show that the same QP modulation of the wave intensity is observed at the same time at very different locations in the inner magnetosphere. ULF magnetic field fluctuations with a period roughly comparable to, but somewhat larger than the period of the QP modulation were detected by the fluxgate magnetometers instrument on board the Cluster spacecraft near the equatorial region, suggesting these are likely to be related to the QP generation. Results of a detailed wave analysis show that the QP emissions detected by Cluster propagate unducted, with oblique wave normal angles at higher geomagnetic latitudes. Quasi-periodic (QP) emissions are electromagnetic emissions at frequencies of about 0.5-4 kHz that are characterized by a periodic time modulation of the wave intensity. Typical periods of this modulation are on the order of minutes. We present a case study of a large-scale long-lasting QP event observed simultaneously on board the DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) and the Cluster spacecraft. The measurements by the Wide-Band Data instrument on board the Cluster spacecraft enabled us to obtain high-resolution frequency-time spectrograms of the event close to the equatorial region over a large range of radial distances, while the measurements by the STAFF-SA instrument allowed us to perform a detailed wave analysis. Conjugate observations by the DEMETER spacecraft have been used to estimate the spatial and temporal extent of the emissions. The analyzed QP event lasted as long as 5 h and it spanned over the L-shells from about 1.5 to 5.5. Simultaneous observations of the same event by DEMETER and Cluster show that the same QP modulation of the wave intensity is observed at the same time at very different locations in the inner magnetosphere. ULF magnetic field fluctuations with a period roughly comparable to, but somewhat larger than the period of the QP modulation were detected by the fluxgate magnetometers instrument on board the Cluster spacecraft near the equatorial region, suggesting these are likely to be related to the QP generation. Results of a detailed wave analysis show that the QP emissions detected by Cluster propagate unducted, with oblique wave normal angles at higher geomagnetic latitudes.
dcterms:title
Conjugate observations of quasi-periodic emissions by Cluster and DEMETER spacecraft Conjugate observations of quasi-periodic emissions by Cluster and DEMETER spacecraft
skos:prefLabel
Conjugate observations of quasi-periodic emissions by Cluster and DEMETER spacecraft Conjugate observations of quasi-periodic emissions by Cluster and DEMETER spacecraft
skos:notation
RIV/68378289:_____/13:00392553!RIV14-AV0-68378289
n3:predkladatel
n4:ico%3A68378289
n5:aktivita
n15:I n15:P
n5:aktivity
I, P(GAP205/10/2279), P(GAP209/11/2280)
n5:cisloPeriodika
1
n5:dodaniDat
n9:2014
n5:domaciTvurceVysledku
n6:9496726 Hayosh, Mykhaylo
n5:druhVysledku
n13:J
n5:duvernostUdaju
n19:S
n5:entitaPredkladatele
n10:predkladatel
n5:idSjednocenehoVysledku
66733
n5:idVysledku
RIV/68378289:_____/13:00392553
n5:jazykVysledku
n14:eng
n5:klicovaSlova
quasi-periodic; QP emissions
n5:klicoveSlovo
n8:quasi-periodic n8:QP%20emissions
n5:kodStatuVydavatele
US - Spojené státy americké
n5:kontrolniKodProRIV
[97722FFEA8FD]
n5:nazevZdroje
Journal of Geophysical Research: Space Physics
n5:obor
n18:BL
n5:pocetDomacichTvurcuVysledku
2
n5:pocetTvurcuVysledku
6
n5:projekt
n17:GAP205%2F10%2F2279 n17:GAP209%2F11%2F2280
n5:rokUplatneniVysledku
n9:2013
n5:svazekPeriodika
118
n5:tvurceVysledku
Cornilleau-Wehrlin, N. Hayosh, Mykhaylo Němec, F. Santolík, Ondřej Pickett, J. S. Parrot, M.
n5:wos
000317858600020
s:issn
2169-9380
s:numberOfPages
11
n12:doi
10.1029/2012JA018380