About: On the origin of lower- and upper-frequency cutoffs on wedge-like spectrograms observed by DEMETER in the midlatitude ionosphere

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About: On the origin of lower- and upper-frequency cutoffs on wedge-like spectrograms observed by DEMETER in the midlatitude ionosphere Goto Sponge Distinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	We report observations of unusual lower and upper cutoff frequencies on VLF spectrograms recorded by the DEMETER satellite orbiting at 700 km. The upper cutoff frequencies vary approximately in proportion to L-3. The lower cutoff frequencies in the spectrograms are almost constant. Between these cutoffs, which form a wedge, intense whistlers are observed, whereas only 0+ whistlers, and probably, ducted whistlers are present outside the cutoffs. We explain the observed spectrograms on the basis of the features of whistler-mode wave propagation in the inner magnetosphere. The upper cutoff frequency is determined by the limiting trajectories that confine the waves of a given frequency propagating obliquely from a source located in the opposite hemisphere. The lower frequency cutoff is determined by the LHR maximum, since quasiresonant waves with lower frequencies originating in the opposite hemisphere do not reach the satellite due to the LHR reflection above it. We report observations of unusual lower and upper cutoff frequencies on VLF spectrograms recorded by the DEMETER satellite orbiting at 700 km. The upper cutoff frequencies vary approximately in proportion to L-3. The lower cutoff frequencies in the spectrograms are almost constant. Between these cutoffs, which form a wedge, intense whistlers are observed, whereas only 0+ whistlers, and probably, ducted whistlers are present outside the cutoffs. We explain the observed spectrograms on the basis of the features of whistler-mode wave propagation in the inner magnetosphere. The upper cutoff frequency is determined by the limiting trajectories that confine the waves of a given frequency propagating obliquely from a source located in the opposite hemisphere. The lower frequency cutoff is determined by the LHR maximum, since quasiresonant waves with lower frequencies originating in the opposite hemisphere do not reach the satellite due to the LHR reflection above it. (en)
Title	On the origin of lower- and upper-frequency cutoffs on wedge-like spectrograms observed by DEMETER in the midlatitude ionosphere On the origin of lower- and upper-frequency cutoffs on wedge-like spectrograms observed by DEMETER in the midlatitude ionosphere (en)
skos:prefLabel	On the origin of lower- and upper-frequency cutoffs on wedge-like spectrograms observed by DEMETER in the midlatitude ionosphere On the origin of lower- and upper-frequency cutoffs on wedge-like spectrograms observed by DEMETER in the midlatitude ionosphere (en)
skos:notation	RIV/68378289:_____/10:00343319!RIV11-MSM-68378289
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA205/09/1253), P(ME09107), Z(AV0Z30420517), Z(MSM0021620860)
http://linked.open...iv/cisloPeriodika	-
http://linked.open...vai/riv/dodaniDat	2011
http://linked.open...aciTvurceVysledku	Chum, Jaroslav Santolík, Ondřej
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav fyziky atmosféry AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	276895
http://linked.open...ai/riv/idVysledku	RIV/68378289:_____/10:00343319
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	DEMETER; midlatitude ionosphere; spectrograms (en)
http://linked.open.../riv/klicoveSlovo	DEMETER midlatitude ionosphere spectrograms
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[44B0565D7B64]
http://linked.open...i/riv/nazevZdroje	Journal of Geophysical Research
http://linked.open...in/vavai/riv/obor	BL
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Electromagnetic phenomena coupling the troposphere, mesosphere, ionosphere and magnetosphere Investigation of propagation of electromagnetic waves observed on the satellite DEMETER
http://linked.open...UplatneniVysledku	2010
http://linked.open...v/svazekPeriodika	115
http://linked.open...iv/tvurceVysledku	Chum, Jaroslav Parrot, M. Santolík, Ondřej Shklyar, D. R. Titova, E. E.
http://linked.open...ain/vavai/riv/wos	000277480900002
http://linked.open...n/vavai/riv/zamer	Studium atmosférického obalu Země v interakci s pozemskými a kosmickými vlivy Fyzikální studium objektů a procesů ve sluneční soustavě a v astrofyzikálních systémech
issn	0148-0227
number of pages	12 (xsd:int)
is http://linked.open...avai/riv/vysledek of	On the origin of lower- and upper-frequency cutoffs on wedge-like spectrograms observed by DEMETER in the midlatitude ionosphere On the origin of lower- and upper-frequency cutoffs on wedge-like spectrograms observed by DEMETER in the midlatitude ionosphere On the origin of lower- and upper-frequency cutoffs on wedge-like spectrograms observed by DEMETER in the midlatitude ionosphere

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