Propagation properties of quasiperiodic VLF emissions observed by the DEMETER spacecraft

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F16%3A00459449" target="_blank" >RIV/68378289:_____/16:00459449 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/16:10334064

Výsledek na webu

<a href="http://dx.doi.org/10.1002/2015GL067373" target="_blank" >http://dx.doi.org/10.1002/2015GL067373</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/2015GL067373" target="_blank" >10.1002/2015GL067373</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Propagation properties of quasiperiodic VLF emissions observed by the DEMETER spacecraft

Popis výsledku v původním jazyce

Quasiperiodic (QP) emissions are electromagnetic waves in the frequency range of about 0.5-4kHz observed in the inner magnetosphere that exhibit a periodic time modulation of the wave intensity, with modulation periods from a few seconds up to 10min. We present results of a detailed wave analysis of nearly 200 events measured by the low-altitude Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) spacecraft. Upper frequency range of studied emissions was limited to 1kHz due to the sampling rate of the analyzed data. It is found that QP emissions propagate nearly field aligned at larger geomagnetic latitudes; they become more oblique at midlatitudes and eventually perpendicular to the ambient magnetic field at the geomagnetic equator and thus perpendicular to the Earth's surface, allowing their downward propagation through the ionosphere. The observed propagation pattern is consistent with the source of emissions located in the equatorial region at larger radial distances.

Název v anglickém jazyce

Propagation properties of quasiperiodic VLF emissions observed by the DEMETER spacecraft

Popis výsledku anglicky

Quasiperiodic (QP) emissions are electromagnetic waves in the frequency range of about 0.5-4kHz observed in the inner magnetosphere that exhibit a periodic time modulation of the wave intensity, with modulation periods from a few seconds up to 10min. We present results of a detailed wave analysis of nearly 200 events measured by the low-altitude Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) spacecraft. Upper frequency range of studied emissions was limited to 1kHz due to the sampling rate of the analyzed data. It is found that QP emissions propagate nearly field aligned at larger geomagnetic latitudes; they become more oblique at midlatitudes and eventually perpendicular to the ambient magnetic field at the geomagnetic equator and thus perpendicular to the Earth's surface, allowing their downward propagation through the ionosphere. The observed propagation pattern is consistent with the source of emissions located in the equatorial region at larger radial distances.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Geophysical Research Letters

ISSN

0094-8276

e-ISSN

—

Svazek periodika

43

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

1007-1014

Kód UT WoS článku

000372056600009

EID výsledku v databázi Scopus

2-s2.0-84959431828