Alpha Transmitter Signals Observed by the Van Allen Probes: Ducted Versus Nonducted Propagation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F22%3A00558677" target="_blank" >RIV/68378289:_____/22:00558677 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/22:10456491

Výsledek na webu

<a href="https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2022GL098328" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2022GL098328</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2022GL098328" target="_blank" >10.1029/2022GL098328</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Alpha Transmitter Signals Observed by the Van Allen Probes: Ducted Versus Nonducted Propagation

Popis výsledku v původním jazyce

The interaction of very low frequency transmitter signals with radiation belt electrons depends ultimately on their wave normal angles. In the equatorial interaction region, these can be either low (ducted propagation) or comparatively large (nonducted propagation). Experimentally distinguishing the two modes is complicated, as multicomponent spacecraft data typically do not extend to high enough frequencies with a sufficient frequency resolution. One exception that we exploit are 11.9 kHz signals from Alpha transmitters detectable by the Van Allen Probes spacecraft. We use multicomponent burst mode measurements to distinguish between the ducted and nonducted modes of propagation and to evaluate their relative importance. While the ducted waves are detected less often, they tend to have larger Poynting fluxes. The total power propagating in the two modes is thus comparable. Magnetic local time and in-situ density fluctuations are main parameters controlling the relative fraction of ducted waves.

Název v anglickém jazyce

Alpha Transmitter Signals Observed by the Van Allen Probes: Ducted Versus Nonducted Propagation

Popis výsledku anglicky

The interaction of very low frequency transmitter signals with radiation belt electrons depends ultimately on their wave normal angles. In the equatorial interaction region, these can be either low (ducted propagation) or comparatively large (nonducted propagation). Experimentally distinguishing the two modes is complicated, as multicomponent spacecraft data typically do not extend to high enough frequencies with a sufficient frequency resolution. One exception that we exploit are 11.9 kHz signals from Alpha transmitters detectable by the Van Allen Probes spacecraft. We use multicomponent burst mode measurements to distinguish between the ducted and nonducted modes of propagation and to evaluate their relative importance. While the ducted waves are detected less often, they tend to have larger Poynting fluxes. The total power propagating in the two modes is thus comparable. Magnetic local time and in-situ density fluctuations are main parameters controlling the relative fraction of ducted waves.

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

2022

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

1944-8007

Svazek periodika

49

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

e2022GL098328

Kód UT WoS článku

000813623100001

EID výsledku v databázi Scopus

2-s2.0-85133000898