Longitudinal Dependence of the Intensity of Whistler Mode Electromagnetic Emissions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10372224" target="_blank" >RIV/00216208:11320/17:10372224 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mff.cuni.cz/veda/konference/wds/proc/pdf17/WDS17_07_f2_Zahlava.pdf" target="_blank" >https://www.mff.cuni.cz/veda/konference/wds/proc/pdf17/WDS17_07_f2_Zahlava.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Longitudinal Dependence of the Intensity of Whistler Mode Electromagnetic Emissions

Popis výsledku v původním jazyce

Statistical studies of the intensity of very low frequency (VLF) electromagnetic waves in the Earth&apos;s inner magnetosphere are usually performed in terms of their frequency, L-shell, magnetic local time (MLT), and geomagnetic activity dependencies. We use the measurements performed by the DEMETER (2004-2010) and Van Allen Probes (2012-2016, still operating) spacecraft to perform an analysis with respect to the geomagnetic longitude, i.e., a parameter which is usually not considered. The longitudinal dependence is observed only inside the plasmasphere and varies with the wave frequency. We distinguish four frequency ranges: (i) up to 500 Hz, which exhibits no longitudinal dependence at all, (ii) from 0.5 to 1 kHz, (iii) from 1 to 2 kHz, in which the longitudinal dependence is most pronounced, and (iv) larger than 2 kHz, where the overall wave intensity significantly falls. The obtained results, especially during the MLT night, are in good agreement with the normalized flash rate calculated from the OTD/LIS data. This strongly suggests that the waves from the lightning activity significantly contribute to the overall wave intensity in the night-side plasmasphere at frequencies from 0.5 to 2 kHz.

Název v anglickém jazyce

Longitudinal Dependence of the Intensity of Whistler Mode Electromagnetic Emissions

Popis výsledku anglicky

Statistical studies of the intensity of very low frequency (VLF) electromagnetic waves in the Earth&apos;s inner magnetosphere are usually performed in terms of their frequency, L-shell, magnetic local time (MLT), and geomagnetic activity dependencies. We use the measurements performed by the DEMETER (2004-2010) and Van Allen Probes (2012-2016, still operating) spacecraft to perform an analysis with respect to the geomagnetic longitude, i.e., a parameter which is usually not considered. The longitudinal dependence is observed only inside the plasmasphere and varies with the wave frequency. We distinguish four frequency ranges: (i) up to 500 Hz, which exhibits no longitudinal dependence at all, (ii) from 0.5 to 1 kHz, (iii) from 1 to 2 kHz, in which the longitudinal dependence is most pronounced, and (iv) larger than 2 kHz, where the overall wave intensity significantly falls. The obtained results, especially during the MLT night, are in good agreement with the normalized flash rate calculated from the OTD/LIS data. This strongly suggests that the waves from the lightning activity significantly contribute to the overall wave intensity in the night-side plasmasphere at frequencies from 0.5 to 2 kHz.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

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

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název statě ve sborníku

WDS&apos;17 Proceedings of Contributed Papers — Physics

ISBN

978-80-7378-356-3

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

9

Strana od-do

46-54

Název nakladatele

Matfyzpress

Místo vydání

Praha

Místo konání akce

Prague, Czech Republic

Datum konání akce

6. 6. 2017

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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