NWC Transmitter Effects on the Nightside Upper Ionosphere Observed by a Low-Altitude Satellite

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10423296" target="_blank" >RIV/00216208:11320/20:10423296 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=HZLYwQcRPa" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=HZLYwQcRPa</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2020JA028660" target="_blank" >10.1029/2020JA028660</a>

Jazyk výsledku

angličtina

Název v původním jazyce

NWC Transmitter Effects on the Nightside Upper Ionosphere Observed by a Low-Altitude Satellite

Popis výsledku v původním jazyce

NWC is an extremely powerful very low frequency (19.8 kHz) transmitter located in the north-west Australia. Although the transmitter typically operates continuously, it was off during the second half of 2007. This allows for a direct comparison of an ionospheric situation at the times when the transmitter is on with the times when the transmitter is off. We use electromagnetic wave and plasma measurements performed by the Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions spacecraft at an altitude of about 660 km. Given that the transmitter signal is significantly attenuated in lower ionospheric layers during the daytime and, moreover, the dayside ionosphere is controlled primarily by the solar radiation, concealing possible transmitter-related effects, we focus exclusively on the nightside. We show that although the NWC transmitter signal does not significantly change the mean plasma density and only slightly increases the electron temperature, it causes significant perturbations of both these quantities at distances up to about 200 km. The wave intensity is considerably enhanced in the same spatial region close to the transmitter in a large range of frequencies above about 14 kHz. Finally, clear signatures of transmitter induced electron precipitation are detected to the east of the transmitter at somewhat larger L- shells, consistent with a gyroresonance condition.

Název v anglickém jazyce

NWC Transmitter Effects on the Nightside Upper Ionosphere Observed by a Low-Altitude Satellite

Popis výsledku anglicky

NWC is an extremely powerful very low frequency (19.8 kHz) transmitter located in the north-west Australia. Although the transmitter typically operates continuously, it was off during the second half of 2007. This allows for a direct comparison of an ionospheric situation at the times when the transmitter is on with the times when the transmitter is off. We use electromagnetic wave and plasma measurements performed by the Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions spacecraft at an altitude of about 660 km. Given that the transmitter signal is significantly attenuated in lower ionospheric layers during the daytime and, moreover, the dayside ionosphere is controlled primarily by the solar radiation, concealing possible transmitter-related effects, we focus exclusively on the nightside. We show that although the NWC transmitter signal does not significantly change the mean plasma density and only slightly increases the electron temperature, it causes significant perturbations of both these quantities at distances up to about 200 km. The wave intensity is considerably enhanced in the same spatial region close to the transmitter in a large range of frequencies above about 14 kHz. Finally, clear signatures of transmitter induced electron precipitation are detected to the east of the transmitter at somewhat larger L- shells, consistent with a gyroresonance condition.

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

<a href="/cs/project/GA18-00844S" target="_blank" >GA18-00844S: Kvaziperiodická modulace magnetosférických plazmových vln</a><br>

Návaznosti

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

Rok uplatnění

2020

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

125

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

e2020JA028660

Kód UT WoS článku

000603639900004

EID výsledku v databázi Scopus

2-s2.0-85098060325