Line radiation events induced by very low frequency transmitters observed by the DEMETER spacecraft

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F17%3A00477409" target="_blank" >RIV/68378289:_____/17:00477409 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/17:10371462

Výsledek na webu

<a href="http://dx.doi.org/10.1002/2017JA024007" target="_blank" >http://dx.doi.org/10.1002/2017JA024007</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/2017JA024007" target="_blank" >10.1002/2017JA024007</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Line radiation events induced by very low frequency transmitters observed by the DEMETER spacecraft

Popis výsledku v původním jazyce

Electromagnetic wave data measured by the low-altitude Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) spacecraft sometimes exhibit intense emissions at discrete, harmonically spaced frequencies. We present a comprehensive analysis of this type of phenomenon, and we demonstrate that it is caused by very low frequency (VLF) transmitters in Europe. All available data were investigated for a possible presence of the events. Altogether, 87 events were identified, occurring exclusively during the nighttime. The occurrence of the events does not show any clear relation to the AE and Dst geomagnetic activity indices. The events are clearly localized, occurring either close to Great Britain or in the vicinity of its geomagnetically conjugated region. The frequency spectra of the events typically consist of up to four spectral peaks at multiples of about 1.3kHz. Additional weaker spectral peaks at frequencies of about 1.9kHz and 3.2kHz are occasionally present. The events observed in the Northern Hemisphere tend to have larger-frequency bandwidths than the events observed in the Southern Hemisphere. The occurrence of these events is correlated with the simultaneous detection of signals from VLF transmitters. A bicoherence analysis is employed to demonstrate that wave-wave coupling takes place. Finally, it is shown that the occurrence of the events is associated with a significantly increased precipitation of energetic electrons in a wide range of energies.

Název v anglickém jazyce

Line radiation events induced by very low frequency transmitters observed by the DEMETER spacecraft

Popis výsledku anglicky

Electromagnetic wave data measured by the low-altitude Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) spacecraft sometimes exhibit intense emissions at discrete, harmonically spaced frequencies. We present a comprehensive analysis of this type of phenomenon, and we demonstrate that it is caused by very low frequency (VLF) transmitters in Europe. All available data were investigated for a possible presence of the events. Altogether, 87 events were identified, occurring exclusively during the nighttime. The occurrence of the events does not show any clear relation to the AE and Dst geomagnetic activity indices. The events are clearly localized, occurring either close to Great Britain or in the vicinity of its geomagnetically conjugated region. The frequency spectra of the events typically consist of up to four spectral peaks at multiples of about 1.3kHz. Additional weaker spectral peaks at frequencies of about 1.9kHz and 3.2kHz are occasionally present. The events observed in the Northern Hemisphere tend to have larger-frequency bandwidths than the events observed in the Southern Hemisphere. The occurrence of these events is correlated with the simultaneous detection of signals from VLF transmitters. A bicoherence analysis is employed to demonstrate that wave-wave coupling takes place. Finally, it is shown that the occurrence of the events is associated with a significantly increased precipitation of energetic electrons in a wide range of energies.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

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 periodika

Journal of Geophysical Research: Space Physics

ISSN

2169-9380

e-ISSN

—

Svazek periodika

122

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

14

Strana od-do

7226-7239

Kód UT WoS článku

000407627100022

EID výsledku v databázi Scopus

2-s2.0-85023200081