VLF Transmitter Signals Observed by the Cluster Spacecraft Over a Wide Range of Latitudes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F25%3A00617310" target="_blank" >RIV/68378289:_____/25:00617310 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/25:10510153

Výsledek na webu

<a href="https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024JA033621" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024JA033621</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2024JA033621" target="_blank" >10.1029/2024JA033621</a>

Jazyk výsledku

angličtina

Název v původním jazyce

VLF Transmitter Signals Observed by the Cluster Spacecraft Over a Wide Range of Latitudes

Popis výsledku v původním jazyce

Very low frequency transmitter signals can penetrate through the ionosphere and propagate in the inner magnetosphere, being observed by spacecraft instruments with sufficient frequency resolution and range. We use 23 years of measurements performed by the Waves of High frequency and Sounder for Probing of Electron density by Relaxation instrument on board the four Cluster spacecraft at frequencies up to 80 kHz to investigate the observed wave intensities. The transmitter signals are about an order of magnitude more intense during the night than during the day, and they are apparently confined within the plasmasphere. The extensive latitudinal coverage of the measurements allows us to investigate frequency cut-offs observed in the transmitter spectra. These are mostly in line with nonducted propagation, but occasional partial ducting seems to be necessary to explain signals spanning otherwise inaccessible regions. Finally, we compare the observed intensity patterns with the calculations of Starks et al. (2020), . Although overall agreement is obtained, the observed wave intensities tend to be a factor of about 2-3 lower than the calculated intensities.

Název v anglickém jazyce

VLF Transmitter Signals Observed by the Cluster Spacecraft Over a Wide Range of Latitudes

Popis výsledku anglicky

Very low frequency transmitter signals can penetrate through the ionosphere and propagate in the inner magnetosphere, being observed by spacecraft instruments with sufficient frequency resolution and range. We use 23 years of measurements performed by the Waves of High frequency and Sounder for Probing of Electron density by Relaxation instrument on board the four Cluster spacecraft at frequencies up to 80 kHz to investigate the observed wave intensities. The transmitter signals are about an order of magnitude more intense during the night than during the day, and they are apparently confined within the plasmasphere. The extensive latitudinal coverage of the measurements allows us to investigate frequency cut-offs observed in the transmitter spectra. These are mostly in line with nonducted propagation, but occasional partial ducting seems to be necessary to explain signals spanning otherwise inaccessible regions. Finally, we compare the observed intensity patterns with the calculations of Starks et al. (2020), . Although overall agreement is obtained, the observed wave intensities tend to be a factor of about 2-3 lower than the calculated intensities.

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

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

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

2169-9402

Svazek periodika

130

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

e2024JA033621

Kód UT WoS článku

001419373600001

EID výsledku v databázi Scopus

2-s2.0-85218980535