Effects of Ducting on Whistler Mode Chorus or Exohiss in the Outer Radiation Belt

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F19%3A00511302" target="_blank" >RIV/68378289:_____/19:00511302 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/19:10396819

Výsledek na webu

<a href="https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019GL083115" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019GL083115</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2019GL083115" target="_blank" >10.1029/2019GL083115</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effects of Ducting on Whistler Mode Chorus or Exohiss in the Outer Radiation Belt

Popis výsledku v původním jazyce

Previously published statistics based on Cluster spacecraft measurements surprisingly show that in the outer radiation belt, lower band whistler mode waves predominantly propagate unattenuated parallel to the magnetic field lines up to midlatitudes, where ray tracing simulations indicated highly attenuated waves with oblique wave vectors. We explain this behavior by considering a large fraction of ducted waves. We argue that these ducts can be weak and thin enough to be difficult to detect by spacecraft instrumentation while being strong enough to guide whistler mode waves in a cold plasma ray tracing simulation. After adding a tenuous hot electron population, we obtain a strong effect of Landau damping on unducted waves, while the ducted waves experience less damping or even growth. Consequently, the weighted average of amplitudes and wave normal angles of a mixture of ducted and unducted waves provides us with strong quasi-parallel waves, consistent with the observations.

Název v anglickém jazyce

Effects of Ducting on Whistler Mode Chorus or Exohiss in the Outer Radiation Belt

Popis výsledku anglicky

Previously published statistics based on Cluster spacecraft measurements surprisingly show that in the outer radiation belt, lower band whistler mode waves predominantly propagate unattenuated parallel to the magnetic field lines up to midlatitudes, where ray tracing simulations indicated highly attenuated waves with oblique wave vectors. We explain this behavior by considering a large fraction of ducted waves. We argue that these ducts can be weak and thin enough to be difficult to detect by spacecraft instrumentation while being strong enough to guide whistler mode waves in a cold plasma ray tracing simulation. After adding a tenuous hot electron population, we obtain a strong effect of Landau damping on unducted waves, while the ducted waves experience less damping or even growth. Consequently, the weighted average of amplitudes and wave normal angles of a mixture of ducted and unducted waves provides us with strong quasi-parallel waves, consistent with the observations.

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

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

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

—

Svazek periodika

46

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

5735-5745

Kód UT WoS článku

000477616200012

EID výsledku v databázi Scopus

2-s2.0-85067668078